The catalyst of oxidative diacetoxybiphenyl 1,3 - pentadiene
(57) Abstract:Usage: chemical technology, catalysts, organic synthesis, oxidative acetoxysilane. The inventive catalyst diacetoxybiphenyl 1,3-pentadiene contains the intermetallic compound of the formula Pd3Sb in the amount of 2.3 to 3.3 wt.%, the rest of the media is activated carbon. Increases the yield of 1,4-and 3,4-diacetoxybenzoic with preferential formation of TRANS-1,4-diacetoxybiphenyl-2. The output of isomers 87-90% . table 4. The invention relates to the primary organic synthesis, and in particular to catalysts for diacetoxybiphenyl S-CIS-1,3-pen - tadiene in diacetoxybiphenyl.The use of diacetoxybenzoic (WCT) depends on their structure. 1,4-Derivatives are the target feedstock for production of acetyl propylene alcohol, methylcyclopropyl, 2-methyltetrahydrofuran and other solvents for the electronics industry. Preferably formed TRANS-1,4-diacetoacetate-2 is a copolymer in the production of cordovero fiber. Along with the resulting 3,4-diacetoacetate-1 is the basis for the synthesis of secondary alcohols, epoxy components and steroids.API 1,3-butadiene, containing Cu or other compounds and Fe, Co, Ni, Ag, Pb, Sb, Bi, Mn, Cr, Mo, W, etc. the Catalyst is used at 250aboutWith the response time of 6-6 .5 hours Out of diacetoxybenzoic (WCT) 65%.The disadvantages of this catalyst:
the low yield of the target product;
high operating temperature of the catalyst;
the difficulty of separation of homogeneous catalysts from the reaction products;
high consumption of the catalytic mass.Known catalyst for acetoxysilane 1,3-alkadienes, including 1,3-pentadiene containing palladium, tellurium, and possibly tin, germanium and lead.The reaction is carried out at 40-180aboutC and a pressure of 1-100 atmospheres. The yield of the target products is not given. For more reactive 1,3-butadiene yield stands at 12.9%.The disadvantage of using this catalyst is extremely low yield of the target products.Known catalyst diacetoxybiphenyl 1,3-pentadiene prototype containing acetates, Pd, si and Li. The reaction is performed for 4 h at 110-130aboutC. the Total yield of diacetoxybenzoic equal to 17%, the yield of 1,4-diacetoxybenzoic-2 is 14% . Target products after washing with water, emit methods extractive chemistry using Baia temperature of the reaction;
the difficulty of separation of homogeneous catalysts from the reaction products.Large costs when washing and extraction of the target diacetoxybenzoic from the reaction mixture.The aim of the invention is to increase the activity of the catalyst in the reaction of oxidative diacetoxybiphenyl 1,3-pentadiene to enhance the yield of 1,4 - and 3,4-diacetoxybenzoic, with a predominant getting isomer TRANS - 1,4-diacetoxybiphenyl-2.The objective according to the present invention is achieved by the use of intermetallic catalyst of the formula PD3Sb deposited on the carrier is activated carbon in the amount of 2.3 to 3.3% by weight of the catalyst, the rest of the media.The hallmark of this catalyst is that the active portion of the catalyst is an intermetallic compound of the formula Pd3Sb, i.e., stibig palladium.The advantages of the present invention before the prototype are:
1. The increased yield of the desired 1,4 - and 3,4-diacetoxybenzoic to 87-88,7%.2. Reducing the temperature of the reaction, which increases the selectivity of the process.3. The application of the proposed catalyst permission is illustrated by the following examples.P R I m e R 1. The catalyst was prepared as follows. Powder recovery activated carbon (AR-5) in an amount of 10 g is treated with 60 ml of 15% nitric acid, evaporated on a water bath to dryness. 75 g of an aqueous solution of the mixture of acids (26 wt.% NGO3and 7.2 wt.%. HCl) dissolved 0,2846 g of palladium chloride, 0,1189 g of antimony chloride. The resulting solution impregnated treated (see above) activated carbon, with stirring, evaporated on a boiling water bath to dryness. The catalyst is placed in a vertical tubular reactor, calcined in air at 150about1 h and restore in a stream of moist hydrogen at 250aboutWith 2.5 h at 420aboutWith - for 1.5 h Such conditions of preparation of the catalyst leads to the formation of intermetallic compounds. Analysis of the catalyst by the method of XPS showed that it corresponds to the composition Pd3Sb in the amount of 2.3 to the weight of the catalyst.Physico-chemical and topochemical characteristics of the catalyst are: specific surface 930-950 m2/g; data micrograph mode REM - uniform particle size with the size of the globules to 50 nm, the distribution of elements on the granule - preferential concentration in the upper layers korechkovogo type over g glacial acetic acid, which reagent and solvent, 10 g of 1,3-pentadiene, 10 g of catalyst containing 2.3 wt. % PD3Sd. The autoclave is sealed, the reaction mixture is heated to 70aboutWith over 0,7 hours Then fed into the autoclave air to reach the pressure of 9.5 MPa and under stirring conduct a reaction for 5 hoursThe balance of the experience shown in the table.1.Analysis of the reaction mixture by GLC showed that the conversion of 1,3-pentadiene is 98,9%, the total yield of diacetoxybenzoic equal to 87.1%, the yield of 1,4-diacetoxybenzoic-2 73,3%.The catalyst is filtered off, washed with glacial acetic acid and recovered by the method of re-activation as described in the method for the preparation of the catalyst (see above) from the stage of calcination.The target products are rectification with the following physicochemical characteristics: CIS-1,4-diaza - toxaphene-2, so Kip. 104-106aboutWith at a residual pressure of 13 mm RT.art., nD201,4358; TRANS-1,4-diacetoacetate-2, so Kip. 117-119aboutWith at a residual pressure of 13 mm RT.art., nD201,4406; 3,4-diacetoacetate-1, so Kip. 91-92aboutWith at a residual pressure of 13 mm RT.article nD201,4290.Thus the total whoIe substances).P R I m m e R 2. The catalyst was prepared and restore, as in example 1, using the basic components in the following quantities, g: palladium chloride 0,3465 g, antimony chloride 0,1478 g, activated carbon 10.Analysis of the catalyst by the method of XPS showed that the active portion of the catalyst corresponds to the composition PD3Sb in the amount of 2.8% by weight of catalyst. Physico-chemical characteristics of the catalyst, as in example 1.Acetoxysilane 1,3-pentadiene carried out in the autoclave as described in example 1, except that the temperature of the 75aboutWith the pressure of 10 MPa.The balance of the experiment are shown in table.2.Analysis of the reaction mixture by GLC showed that the conversion of 1,3-pentadiene is 99.4% of the total output of diacetoxybenzoic equal to 88.4%, the yield of 1,4-diacetoxybenzoic-2 equal to 74.1%.The catalyst is filtered off, the target products are rectification with the following physicochemical characteristics: CIS-1,4-diacetoacetate-2, so Kip.103-106aboutWith at a residual pressure of 13 mm RT.art., nD201,4360, TRANS-1,4-diacetoacetate-2 - so Kip. 118-120aboutWith at a residual pressure of 13 mm RT. Art. , nD201,4407, 3,4-diacetoacetate-1, Kip. 90-93aboutWhen the residual pressure,5% (20,26 g). The purity of the end product is 99.8%.P R I m e R 3. The catalyst was prepared and restore, as in example 1, using the basic components in the following quantities, g: palladium chloride 0,4084, antimony chloride 0,1742, activated carbon 10.Analysis of the catalyst by the method of XPS showed that the active portion of the catalyst corresponds to the composition PD3Sb in an amount of 3.3% by weight of catalyst. Physico-chemical characteristics of the catalyst as in example 1.Acetoxysilane 1,3-pentadiene carried out in the autoclave as described in example 1, except that the temperature of 80aboutC and a pressure of 9.0 MPa.The balance of the experiment are shown in table.3.Analysis of the reaction mixture by GLC showed that the conversion of 1,3-pentadiene is 99.6% , the total yield of diacetoxybenzoic equal to 88.7%, the yield of 1,4-diacetoxybenzoic-2 equal 74,6%.The catalyst is filtered off, the target products are rectification with physico-chemical characteristics as in example 1. The output of diacetato 88,0% (24,1 g), the yield of 1,4-WCT-2 74,1% (20,3 g). The purity of the end product is 99.8%.Shows a pivot table.4 diacetoxybiphenyl 1,3-pentadiene catalyst Pb3Sb/activated carbon. The CATALYST Carney increasing the activity, it contains intermetallide - stibig palladium formula Pd3Sb and activated carbon as a carrier and has the following composition, wt.%:
Stibig palladium mentioned formula 2,3 - 3,3
Activated charcoal Else
FIELD: organic chemistry, chemical technology, catalysts.
SUBSTANCE: invention relates to a method for preparing acetic acid by gas-phase oxidation of ethane and/or ethylene with oxygen using catalyst comprising molybdenum and palladium. For realization of method gaseous feeding comprising ethane, ethylene or their mixture and oxygen also are contacted at enhanced temperature with catalyst that comprises elements Mo, Pd, X and Y in combination with oxygen of the formula (I): MoaPdbXcYd wherein X and Y have the following values: X means V and one or some elements optionally taken among the following group: Ta, Te and W; Y means Nb, Ca and Sb and one or some elements optionally taken among the following group: Bi, Cu, Ag, Au, Li, K, Rb, Cs, Mg, Sr, Ba, Zr and Hf; indices a, b, c and d mean gram-atom ratios of corresponding elements wherein a = 1; b = 0.0001-0.01; c = 0.4-1, and d = 0.005-1. Niobium is added to the catalyst structure using niobium ammonium salt. Preferably, niobium ammonium salt is used as the niobium source. The continuance of contact time and composite values of the parent gaseous mixture are so that taken to provide output value by acetic acid to be above 470 kg/(m3 x h). The selectivity of oxidation reaction of ethane and/or ethylene to acetic acid is above 70 mole %. Invention provides enhancing stability and output of catalyst.
EFFECT: improved preparing method.
14 cl, 1 tbl, 6 ex
FIELD: petroleum processing and petrochemistry.
SUBSTANCE: catalytic reforming of gasoline fractions is accomplished in a system constituted by several in series connected reactors at elevated pressure and hydrogen-containing gas circulation, wherein temperature of gas at first reactor inlet ranges from 380 to 470°C and in the other reactors 470-540°C. Reforming catalyst comprises alumina-supported platinum, fluorine, and optionally rhenium. In the first reactor, catalyst additionally contains 0.02 to 1.5% of fluorine.
EFFECT: increased yield and improved quality of product.
2 cl, 7 tbl, 7 ex
FIELD: chemical industry; methods of manufacture of the deposited polymetallic catalytic agents.
SUBSTANCE: the invention is pertaining to the methods of manufacture of the oxidation catalytic agents based on any solid carriers by deposition on them of the metals solid solutions. The catalytic agents may be used in the various fields of the catalysis, for example, for realization of the photocatalytic, electrocatalytic, catalytic and other reactions. The invention presents the description of the method of manufacture of the deposited polymetallic catalytic agents by deposition of the metals on ceramics, plastics materials, metals, composite materials, oxides of the transition metals, the carbonic material, which includes the sequential stages of deposition of the previous layers carrying the cationic and anionic parts and for recovery. In the capacity of the previous layer carrying the cationic part use the substances of the following composition: [М(NH3)xАy]Вz, where M - Cr, Со, Ni, Cu, Zn, Ru, Rh, Pd, Ag, Cd, Ir, Pt, Au; А - ОН, Н20, C1, Br, I, NO, NO2; В - OH, F, Cl, Br, I, NO2, NO3, SO4; and as the previous layer carrying the anionic part use the substance of the following composition: Еx2[M'Dy2Cz2], where М' - Ti, Cr, Со, Ni, Cu, Zn, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg; С - ОН, Н20, F, SCN, Cl, Br, I, NO, NO2; D - ОН, Н20, F, SCN, Cl, Br, I, NO, NO2; Е - Н, Li, Na, К, Rb, Cs, NH4; or as the previous layer carrying the cationic part use the substances having the following composition: [М(NH3)xАy]Вz and/or [М1(NH3)x1Аy1]Вz1, where M AND M1 - Cr, Со, Ni, Cu, Zn, Ru, Ag, CD, Ir, Pt, Au; А - ОН, Н20, C1, Br, I, NO, NO2; В - OH, F, Cl, Br, I, NO2, NO3, SO4; and as the previous layer carrying the anionic part use the substances having the following composition: Еx2[M'Dy2Cz2] and/or Еx3[M'1Dy3Cz3], where М' and М'1 - Ti, Cr, Со, Ni, Cu, Zn, Zr, Nb, Mo, Tc, Ru, Ag, Cd, Hf, Ta, W, Os, Ir, Pt, Au, Hg; С - ОН, Н20, F, Cl, Br, I, NO, NO2; D - ОН, Н20, F, Cl, Br, I, NO, NO2; Е - Н, Li, Na, К, Rb, Cs, NH4; or as the previous layer carrying both the cationic part and then anionic part use the substance having the following composition: [М(NH3)xАy]x1[M'Dy1Cz1]z, where: M - Cr, Со, Ni, Cu, Zn, Ru, Rh, Pd, Ag, Cd, Ir, Pt, Au; А - ОН, Н20, C1, Br, I, NO, NO2; М' - Ti, Cr, Со, Ni, Cu, Zn, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, 0s, Ir, Pt, Au, Hg; С - ОН, Н20, F, Cl, Br, I, NO, NO2; D - ОН, Н20, F, Cl, Br, I, NO, NO2. The technical result of the invention is the high activity of the produced catalytic agents.
EFFECT: the invention ensures the high activity of the produced catalytic agents.
14 cl, 3 tbl, 97 ex
FIELD: petrochemical processes.
SUBSTANCE: feed stream is passed with admixed oxygen and diluent through catalyst bed at 400-500°C and constant flow rate 50 mL/min, said catalyst being catalytic system for heterogeneous reactions and representing geometrically structured system including microfibers of high-silica fibrous carrier, which is characterized by presence in IR absorption band of hydroxyl groups with wave number ν=3620-3650 cm-1 and half-width 65-75 cm-1. The carrier has specific surface as measured according to BET method from heat desorption of argon SAr=0.5-30 m2/g, surface area as measured by alkali titration method SNa=5-150 m2/g at ratio SNa/SAr=5-50, and at least one active element, whose principal portion is composed in the form of charged either metallic, or bimetallic clusters characterized in UV-vis diffuse reflection spectrum by specific bands in the region 34000-42000 cm-1 and ratio of integral intensity of band attributed to charged either metallic, or bimetallic clusters to integral intensity of band belonging to, respectively, either metallic, or bimetallic particles is not less than 1.0.
EFFECT: increased choice of oxidative dehydrogenation catalysts.
4 cl, 5 ex
FIELD: petroleum processing catalysts.
SUBSTANCE: catalyst containing platinum, rhenium, antimony, and chlorine on alumina are prepared by impregnation of carrier with aqueous solution of compounds of indicated elements, antimony being deposited as first or second component. Once antimony or platinum-antimony combination, or rhenium-antimony combination deposited, catalyst is dried at 130°C and then calcined in air flow at 500°C. Reduction of catalyst is performed at 300-600°C and pressure 0.1-4.0 MPa for 4 to 49 h. After deposition of antimony or two elements (platinum-antimony or rhenium-antimony) and drying-calcination procedures, second and third or only third element are deposited followed by drying and calcination. Final reduction of catalyst is accomplished in pilot plant reactor within circulating hydrogen medium at pressure 0.3-4.0 MPa and temperature up to 600°C for a period of time 12 to 48 h.
EFFECT: enhanced aromatization and isomerization activities of catalyst and also its stability.
2 cl, 1 tbl, 8 ex
FIELD: petroleum processing and catalysts.
SUBSTANCE: invention relates to bismuth- and phosphorus-containing catalyst carriers, petroleum reforming catalysts prepared on these carriers, to methods for preparing both carriers and catalysts, and to petroleum reforming process using these catalysts. Described are catalyst carrier containing γ-alumina particles wherein bismuth and phosphorus are distributed essentially uniformly in catalytically efficient concentrations and a method for preparation thereof comprising (a) preparing solution containing bismuth precursor and solution containing phosphorus precursor; (b) preparing γ-alumina/alumina sol mixture; (c) mixing mixture of step (b) with solutions prepared in step (a) to produce carrier precursor containing essentially uniformly distributed phosphorus and bismuth; (d) molding; and (e) drying and calcination. Invention also describes petroleum reforming catalyst containing above-defined carrier and catalytically efficient amount of platinum, chlorine, and optionally rhenium; method of preparation thereof; and petroleum reforming process after hydrofining, which involves contacting petroleum with above-defined catalyst in presence of hydrogen at elevated temperature and pressure.
EFFECT: reduced catalyst coking velocity and achieved high stable activity of catalyst.
25 cl, 6 dwg, 4 tbl, 10 ex
SUBSTANCE: method for olefine epoxidation is invented which includes the reaction of the raw material containing olefine, oxygen and organic halogenide, in presence of the catalyst containing silver and rhenium precipitated on the carrier where the catalyst contains rhenium at 1.5 mol/kg of the catalyst mass, at maximum, and 0.0015 mmol/m3 of the carrier surface, at maximum, and where the reaction temperature is increased so as to partially reduce the effect of catalyst loss, and the halogenide is presented in relative Q amount which is maintained constant and where the relative amount of Q is the ratio of the effective molar amount of the active halogen compound in the raw material, to the effective molar amount of hydrocarbon, in the raw material. The invention also implies the method for producing the 1,2-diol, the simple ether of the 1,2-diol and/or alkanolamine and the catalyst to be applied in the said method.
EFFECT: stability of catalyst activity is increased.
22 cl, 8 tbl, 3 ex
SUBSTANCE: described is mass of metal oxides, intended as catalyst for heterogeneously-catalysed partial oxidation and/or ammoxidation of at least one saturated and/or unsaturated hydrocarbon, of general stechiometry I MO1VaM1 bM2 cM3 dOn (I), were M1= stands for Te; M2=stands for Nb; M3= stands for at least one of elements from group, which includes Pb, Ni, Co, Bi and Pd; a = 0.05 to 0.6, b= 0.01 to 0.5, c= 0.01 to 0.5, d = 0.0005 to 0.5 and n= equals the number determined by valence and number of different from oxygen elements in (I), whose X-ray diffractogragm has diffraction reflexes h, i and k , whose peaks are at diffraction angles (2Θ) 22.2±0.5° (h), 27.3±0.5° (i) and 28.2±0.5° (k), and - diffraction reflex h in the range of X-ray diffractogram is the most intensive and has peak half-width maximal value 0.5°, intensity Pi of diffraction reflex i and intensity Pk fulfill ratio 0.65≤R≤0.85, in which R is determined by formula R=Pi/(Pi+Pk) intensity ratio, and - half-width of diffraction reflex i and diffraction reflex k each constitute ≤1°, and at least one mass of metal oxides (I) represents such, X-ray diffractogram of which does not have diffraction reflex with peak position 2Θ=50.0±0.3°. Described is mass of metal oxides, which contains equal or more than 80 wt % of at least one mass of metal oxides, indicated above, and whose X-ray diffractogram has diffraction reflex with peak 2Θ=50.0±0.3°.Also described are methods of heterogeneously catalysed partial gas phase oxidation or ammoxidation of at least one saturated or unsaturated hydrocarbon, using as catalytic active mass at least one mass of metal oxides, described above. Described is method of obtaining metal oxides mass by mixing sources of its elementary components, calcination of dry mixture at 350-700°C and washing by organic and/or inorganic acid solution.
EFFECT: increasing target product selectivity.
17 cl, 1 tbl, 16 ex, 17 dwg
FIELD: environmental protection.
SUBSTANCE: catalyst includes metal oxide substrate consisting mainly of cerium and/or zirconium oxide. Noble metal and metal or semimetal oxide (MOx) are attached to metal oxide substrate, where M is selected out of group including iron, gallium, silver, molybdenum, tungsten, thallium and bismuth. Metal or semimetal M has larger electronegativity than that of cerium or zirconium.
EFFECT: enhanced activity of noble metal in catalyst at low temperatures, prevented caking of noble metal.
11 cl, 3 dwg, 9 tbl, 14 ex
SUBSTANCE: present invention relates to catalysis, and specifically to methods of preparing catalysts for gas-phase redox reactions. The invention discloses a method of preparing a catalyst for gas-phase redox reactions based on complex oxides, involving formation of a coating on a support of given configuration through layer-by-layer deposition of an aqueous solution which contains metallic components of a complex oxide in form of a mixture of decomposable salts and a water-soluble polymer, and subsequent roasting at 873-1173 K for 0.5-5 hours. The support material is nickel in form of a highly porous permeable cellular material. Before applying the aqueous solution of salts, the support undergoes thermal treatment in an oxygen or air atmosphere at 673-1073 K for 0.1-6 hours. Before thermal treatment, the support is briefly put into an aqueous solution of an oxygen-containing acid which forms thermally decomposable salts, and then briefly washed with water to remove free acid residues.
EFFECT: simple catalyst preparation technology and increased catalyst activity.
1 tbl, 1 ex
FIELD: vinyl acetate production by ethane catalytic acetoxylation with acetic acid obtained as intermediate.
SUBSTANCE: claimed method includes: a) bringing gaseous raw material, containing ethane as a main component, into contact in the first reaction zone with molecular oxygen-containing gas in presence of catalyst to obtain the first product stream including acetic acid and ethylene; b) bringing the said first product stream in second reaction zone with molecular oxygen-containing gas in presence of catalyst to obtain the second product stream including vinyl acetate; c) separation the second product stream from stage b) to recovery of vinyl acetate. In the first reaction zone catalyst of general formula MOaPdbXcYd is used, wherein X is at least one element selected from Ti, V, and W; Y is at least one element selected from Al, Bi, Cu, Ag, Au, K, Rb, Cs, Mg, Ca, Sr, Ba, Nb, Sb, Si, and Sn; a, b, c, and d are gram-atom ratio, and a = 1; b = 0.0001-0.01, preferably 0.0001-0.005; c = 0.4-1, preferably 0.5-0.8; and d = 0.005-1, preferably 0.01-0.3. Gaseous raw material from step a) preferably includes ethane and molecular oxygen-containing gas in volume ratio of ethane/oxygen between 1:1 and 10:1, and 0-50 % of vapor as calculated to total volume of starting raw material. Ratio of selectivity to ethylene and selectivity to acetic acid in the first product stream is 0:95-95:0.
EFFECT: integrated technological cycle with controllable product yield while changing technological parameters of the process.
6 cl, 11 ex, 2 tbl, 1 dwg
FIELD: catalyst carrier materials.
SUBSTANCE: microspherical particles are manufactured by adding specified proportion of fine, preferably reused particles to suspension of silica sol and silica powder, which suspension is then subjected to spray drying to form microspherical particles, which are finally calcined. Thus obtained particles are suitable for use as carrier for catalytically active component when preparing catalyst employed in fluidized-bed form in production of monomers used as vinyl polymer precursors.
EFFECT: increased abrasion resistance of particles.
10 cl, 1 tbl, 9 ex
SUBSTANCE: invention relates to a layered composite, method of making and method of converting hydrocarbons using said composite. A layered composite is described for catalytic production of alkenyl alkanoates, containing an inner core and an outer layer, which contains heat-resistant inorganic oxide, a fibrous component, inorganic binder and palladium, gold or their mixture as the catalytic component, dispersed in the outer layer. A method is described for production of alkenyl alkanoates, involving bringing a mixture of alkene, alkanecarboxylic acid and oxygen-containing gas into contact with the catalyst described above. A method is also described for making a catalyst for production of alkenylalkanoate, involving coating an inner core with a suspension, containing an outer heat-resistant inorganic oxide, fibrous component, inorganic binder precursor, organic binder and solvent, so as to obtain a core with an outer coating layer, and baking at temperature below 200°C for a period of time sufficient for binding the outer layer to the inner core, so as to obtain a layered composite, which contains a catalytic component containing palladium, rhodium, gold or their combination.
EFFECT: obtaining high-strength catalyst.
28 cl, 5 ex
SUBSTANCE: present invention relates to a method of producing a catalyst or procatalyst, to catalysts for producing alkenylalkanoates and a method of producing alkenylalkanoates. A method is described for making a catalyst or procatalyst, suitable for use together to produce alkenylalkanoates, involving bringing palladium-, gold- and rhodium-containing precursors into contact with carrier material, calcination in a non-reducing atmosphere, reduction of the palladium-, gold- and rhodium-containing precursors as a result of bringing reducing medium into contact with carrier material and bringing acetate of an alkali metal into contact with reduced carrier material. Described is a catalyst composition for producing alkenylalkanoates which contains: carrier material, which contains at least palladium, rhodium, gold and acetate of alkali metal which are brought into contact with the carrier material, obtaining a catalyst or procatalyst for producing alkenylalkanoates, where at least palladium and rhodium are calcined in a non-reducing atmosphere. Also described is a method of producing alkenylalkanoates, involving bringing initial material, which contains alkene, alkane acid and oxidising agent into contact with the above described catalyst or procatalyst.
EFFECT: increased activity and selectivity of catalyst for producing alkenylalkanoates.
41 cl, 6 tbl,12 ex
SUBSTANCE: present invention relates to catalysts, methods of preparing catalysts and methods of producing alkenyl alkanoates. A method is described for preparing a catalyst suitable for use in production of alkenyl alkanoates, involving: deposition of a first carrier material and binding agent on a second carrier material to obtain layered carrier material in form of particles with an inner and an outer layer, where catalyst components in form of palladium, gold or combinations thereof are contained in the outer layer of the layered carrier material. A catalyst is also described for producing alkenyl alkanoates, which contains: layered carrier material in form of particles with at least an outer layer containing a first carrier material and binding agent, and an inner layer containing a second carrier material, where the outer layer contains at least palladium combined with gold which is in contact with it to obtain the catalyst, where the inner layer essentially does not contain palladium and gold. A method is described for producing alkenyl alkanoates, involving: bringing raw material containing alkene, alkanoic acid and oxidising agent into contact with a catalyst prepared using the method described above.
EFFECT: improved production of alkenyl alkanoates, reduced amount of by-products and increased efficiency of production.
44 cl, 6 tbl, 15 ex
SUBSTANCE: present invention relates to a method of preparing a catalyst or procatalyst suitable for use in production of alkenylalkanoates, to a catalyst composition for production of alkenylalkanoates and to a method of producing alkenylalkanoates. The invention describes a method of preparing a catalyst or procatalyst which involves bringing at least one solution of a catalyst component precursor which contains palladium or gold into contact with support material, where at least one solution of the catalyst component precursor is an aqueous solution which contains one or more of Pd(NH3)2(NO2)3, Pd(NH3)4(OH)2, Pd(NH3)4(NO3)2, Pd(NH3)4(OAc)2, Pd(NH3)2(OAc)2, Pd(NH3)4(HCO3)2) and of NaAuO2, KAuO2, NMe4AuO2 and HAu(NO3)4 in nitric acid or their combinations and reduction of palladiuim or gold when the reducing medium is brought into contact with the support material. The invention describes a catalyst composition which contains support material containing at least palladium and gold which is brought into contact with the support material to obtain a catalyst or procatalyst using the method described above. Described also is a method of producing alkenylalkanoates which involves bringing starting material which contains alkene, alkanoic acid and oxidising agent into contact with a catalyst or procatalyst described above.
EFFECT: reduced amount of by-products and more efficient production of alkenylalkanoates.
32 cl, 6 tbl, 15 ex
SUBSTANCE: invention relates to chemistry and specifically to chemistry of catalytic processes and can be used in production of a vinyl acetate synthesis catalyst. Described is a method of producing a catalyst for synthesis of vinyl acetate, which contains gold and palladium, involving saturation of a support with gold and palladium salt solutions, followed by reducing gold and palladium. The reducing agent used to reduce gold and palladium is perhydro-(1,3,5-dithiazin)-5-yl-methane of formula C4H7NS2, which is taken in amount of not less than 200% of the total weight of the gold and palladium. Thermal treatment is then carried out at temperature 500-600°C for 2 hours.
EFFECT: method increases output of vinyl acetate.
2 cl, 3 ex, 1 dwg
SUBSTANCE: invention relates to a method of producing vinyl acetate, involving bringing starting material containing ethylene, acetic acid and an oxygen-containing gas into contact with a palladium- or gold-containing catalyst obtained on a calcined and modified carrier material to form vinyl acetate and at least one by-product, where the carrier material is modified with 1) niobium, magnesium, tantalum, yttrium, lanthanum, praseodymium or combinations thereof; or 2) titanium, zirconium or combinations thereof, where the carrier material is selected from zirconium dioxide, titanosilicate or zirconosilicate, and where the modified carrier material is calcined before adding catalyst components. The invention also relates to a method of producing a catalyst which is suitable for producing vinyl acetate, as well as a catalytic composition for catalysis of production of alkenylalkanoates, including carrier material with at least one modifier, palladium and gold, which react to form a catalyst, where the modified carrier material undergoes calcinations in a non-reducing atmosphere, and the modifier includes 1) niobium, magnesium, tantalum, yttrium, lanthanum, praseodymium or combinations thereof; or 2) titanium, zirconium or combination thereof, where the carrier material is selected from zirconium dioxide, titanosilicate or zirconosilicate.
EFFECT: obtaining catalysts which can be used to produce alkenylalkanoates in general and vinyl acetate in particular, and which are suitable for use in obtaining low ratio of EA/VA while maintaining or improving selectivity of producing CO2.
SUBSTANCE: present invention relates to a carrier with a catalytic coating, production method thereof, use thereof in processes with heterogeneous catalysts, as well as a reactor containing the said catalyst layer. Described is a carrier with a catalytic coating, having at least one porous and cavity-containing catalyst layer, where the cavity consists of random voids with size greater than 5 mcm in at least two dimensions or with cross-sectional area of at least 10 mcm2. Described is a method of producing the said carrier, comprising a) preparing a carrier substrate, b) if needed, depositing an adhesion improving layer, c) spraying a suspension with at least 30% content of solid substance containing a catalytically active substance with average diameter of at least 5 mcm and/or precursor thereof and, if needed, an additional component of a catalytically active layer, and d) if needed, repeating step c) once or more. Described is a rector with a surface intended for coating, having at least one carrier with a catalytic coating described above. Described is use of the carrier in a method for catalytic oxidation of aliphatic compounds, in a method for oxidation of xylene and/or naphthalene to phthalic acid, in a method for oxidative coupling of acetic acid and ethane to form vinyl acetate using oxygen, in a method for catalytic hydrogenation of organic compounds and in a method for converting synthetic gas.
EFFECT: catalytic coatings are characterised by high adhesion strength of layers, having stability, negligible tolerance on layer thickness and mass-transfer resistance and can be universally used in multiple catalyst systems.
51 cl, 3 ex, 5 dwg