A method of obtaining a nickel catalyst for hydrogenation of aromatic hydrocarbons
(57) Abstract:Describes how to obtain a Nickel catalyst for hydrogenation of aromatic hydrocarbons, including the application of Nickel on alumina powder medium with subsequent formation of a granular catalyst, characterized in that as alumina media use-Al2O3the application of metallic Nickel is carried out by chemical recovery from a solution containing a salt of Nickel, a reducing agent and complexing agents, followed by rinsing in water and drying at a temperature of 120-150°C, the formation of granules of the catalyst in the form of porous plates is carried out by plasma spraying in an inert substrate. The technical result is an increase in the activity of the Nickel catalyst for hydrogenation at lower pressure in the system, excluding the pre-activated catalyst, as well as increasing its mechanical strength. table 1. The invention relates to the field of chemical and petrochemical industry, namely the production of Nickel catalysts on alumina carriers, and can be used in hydrogenations aromaticheskikhO2specific shape and porous structure) with aqueous solutions of Nickel salts followed by calcination and recovery in a stream of hydrogen (Setterfield Hours Practical course of heterogeneous catalysis. - M.: Mir, 1984, S. 185). The process in the presence of such a catalyst is carried out at temperatures of 150-200oC and a pressure of about 3 MPa.The main disadvantage of this method is the use as a carrier of low-temperature forms of alumina (boehmite, pseudoboehmite, -Al2O3and others ), which allows to obtain a catalyst of a specific porous structure, but at the same time reduces its mechanical strength.Closer to the invention of the technical essence is a method of obtaining, based on the mechanical components are mixed in the presence of a liquid phase. In particular, the method of producing a catalyst containing 50% NiO (39,3% Ni), by mixing the basic Nickel carbonate with alumina media (mixture-Al2O3and-Al2O3at a ratio of 0.05:0.95 to) in the presence of patinator - aqueous solution of ammonia, followed by drying at 100-120oC and calcining at 300 to 500oC, chopping, mixing with graphite and pelletizing (RU, patent, 2102145, CL 01 J 37/04, 1998).
-1.However, the Nickel catalyst obtained in this way has insufficient activity and requires the use of high hydrogen pressures.The basis of the invention the task is to increase the activity of the Nickel catalyst for hydrogenation at lower pressure in the system, to eliminate the preliminary activation of catalyst, and also to enhance its mechanical strength.The invention consists in obtaining a Nickel catalyst for hydrogenation of applying the metallic Nickel powder of alumina media (-Al2O3), by chemical recovery from a solution containing a salt of Nickel, a reducing agent and complexing agents, followed by rinsing in water and drying at a temperature of 120-150oC and obtain porous structures in the form of plates by plasma spraying in an inert substrate.The method of preparation of the catalyst is carried out as follows.The calculation of the number of ishodnoe by the formula:
< / BR>G NiCl26H2O - content of Nickel chloride in solution (g/l);
V - volume of solution;
n is the number of regenerations;
(% Ni) - set the percentage of Nickel in the finished catalyst.In a solution containing 48 g/l of Nickel chloride and 70 g/l of sodium citrate (complexing agents), pour 220 g/l of alumina powder, mix thoroughly and leave for 5-6 hours at a temperature of 20-25oC. This operation provides activating powder media before plating it with Nickel. Then add 200 ml/l of hydrazine hydrate (reducing agent) and with constant stirring, adding sodium hydroxide to bring the pH of the solution to values of 13-14 and her constant support. Gradually heat the solution to a temperature of 70-80oC. Check the color of the solution using a glass tube. When the bleaching solution regenerate, giving him a dry salt of Nickel chloride (48 g/l). The number of regenerations is determined by the Nickel content in the catalyst.At the end of the process the resulting powder was thoroughly washed first 6-7 times with tap water, then 1-2 times distilled. Dried at a temperature of 120-150oC.Using plasma installation pole maximum porosity structure with sufficient mechanical strength.The catalytic properties of the samples of Nickel catalysts was investigated in the reaction of hydrogenation of the aromatic hydrocarbons (toluene) on microprotol installation flow type at a pressure of 0.25 MPa, the feed rate of the hydrogen - 18 l/h and flow rate of feed of 0.5 h-1. The results of catalytic tests of samples with different Nickel content presented in the table.As can be seen from the data presented in the table, the Nickel catalyst obtained by the proposed method, at a temperature of 150oC and low pressure (0.25 MPa) provides complete conversion of toluene with less in comparison with the prototype, the Nickel content (22%). Use as a carrier-Al2O3and plasma methods of forming patterns of the catalyst can improve its mechanical strength. A method of obtaining a Nickel catalyst for hydrogenation of aromatic hydrocarbons, including the application of Nickel on alumina powder medium with subsequent formation of a granular catalyst, characterized in that as alumina media use-Al2O3the application of metallic Nickel is carried out by holidaysa washing in water and drying at a temperature of 120 150oWith the formation of granules of the catalyst in the form of porous plates is carried out by plasma spraying in an inert substrate.
FIELD: composition and structure of composite metal semiconductor meso-porous materials; titanium-dioxide-based catalyst for photo-chemical reactions.
SUBSTANCE: proposed catalyst is meso-porous titanium-dioxide-based material containing crystalline phase of anatase in the amount no less than 30 mass-% and nickel in the amount no less than 2 mass-%; material has porous structure at average diameter of pores from 2 to 16 nm and specific surface no less than 70 m2/g; as catalyst of photo-chemical reaction of liberation of hydrogen from aqua-alcohol mixtures, it ensures quantum reaction yield from 0.09 to 0.13. Method of production of such catalyst includes introduction of precursor - titanium tetraalkoxyde and template of organic nature, holding reagent mixture till final molding of three-dimensional structure from it at successive stages of forming sol, then gel, separation of reaction product and treatment of this product till removal of template; process is carried out in aqua-alcohol solvent containing no more than 7 mass-% of water; at least one of ligands is introduced into solvent as template; ligand is selected from group of macro-cyclic compounds containing no less than four atoms of oxygen and/or from complexes of said macro-cyclic compounds with ions of metals selected from alkaline or alkaline-earth metals or F-metals containing lithium, potassium, sodium, rubidium, cesium, magnesium, calcium, strontium, barium, lanthanum and cerium; mixture is stirred before forming of sol maintaining its temperature not above 35°C till final molding of three-dimensional structure from reagent mixture; mixture is held in open reservoir at the same temperature at free access of water vapor; after removal of template from three-dimensional structure, mixture is first treated with nickel salt solution during period of time sufficient for withdrawal of nickel ions from solution by pores of structure, after which is it kept in hydrogen-containing medium during period of time sufficient for reduction of nickel ions in pores of structure to metallic nickel.
EFFECT: enhanced sorption and photo-catalytic parameters; reproducibility of catalyst properties.
7 cl, 68 ex
FIELD: chemical technology, catalysts.
SUBSTANCE: invention relates to a nickel-containing catalyst and to a method for the oligomerization reaction of ethylene to a mixture of olefin products with high degree of linearity. Invention describes a composition of catalyst comprising product prepared by interaction of the following components in a polar organic solvent in the presence of ethylene: (a) bivalent nickel simple salt with solubility at least 0.001 mole per liter in indicated polar organic solvent; (b) boron hydride-base reducing agent; (c) water-soluble base; (d) ligand chosen from o-dihydrocarbylphosphinobenzoic acids and their alkaline metal salts; (e) trivalent phosphite wherein the molar ratio of ligand to phosphite is in limits from about 50:1 to about 1000:1. Also, invention describes a method for preparing the catalyst composition and a method for synthesis of a mixture of olefin products showing the high degree of linearity. Invention provides preparing the economically effective catalyst useful in synthesis of olefin substances showing the high degree of linearity.
EFFECT: improved and valuable properties of catalyst.
10 cl, 2 tbl, 3 ex
FIELD: petrochemical process catalysts.
SUBSTANCE: invention relates to determining polymerizing activity of catalysts that can be used for hydrogenation of unsaturated compounds contained in liquid pyrolysis products. As a variable reflecting polymerizing activity of hydrogenation catalysts, optical density value of liquid mixture is used, said mixture containing unsaturated compounds and being kept in contact with catalyst at elevated temperature for a predetermined period of time. Determination of polymerizing activity is accomplished by comparing optical density of liquid mixture containing unsaturated compounds before and after its contact with catalyst. In order to measure optical density of liquid mixture, standard laboratory equipment (photocolorimeter and spectrophotometer) may be utilized.
EFFECT: enabled comparison of polymerizing activity of catalysts directly with respect to industrial feedstock.
3 cl, 2 dwg, 3 tbl, 38 ex
FIELD: gas treatment.
SUBSTANCE: invention relates to improved method for removing acetylene compounds from hydrocarbon streams, which method comprises bringing hydrocarbon stream containing a first concentration of acetylene compounds and olefins with catalyst being consisted either of supported non-sulfided metallic nickel or the same modified with metals such as Mo, Re, Bi, or mixture thereof, said non-sulfided nickel being present on support in quantity by at least 5% superior to quantity required for selective hydrogenation of acetylenics. Hydrogenation is carried out in first reaction zone at temperature and pressure as well as hydrogen concentration favoring hydrogenation of acetylenics, after which hydrocarbon material is discharged containing second concentration of acetylenics inferior to its first concentration.
EFFECT: improved acetylenics removal selectivity and increased yield of target olefin compounds.
20 cl, 10 dwg, 1 tbl, 6 ex
FIELD: chemical industry; petrochemical industry; hydrogen power industry; metallurgy industry; coke industry; other industries; methods of production of hydrogen and the nanofibrous carbonic materials.
SUBSTANCE: the invention is pertaining to the catalytic productions of hydrogen and the carbonic materials of the nanofibrous structure out of the hydrocarbon. The invention may be used in the chemical industry, the petrochemical industry at utilization of the hydrocarbon gases, and also in the hydrogenous power industry, in metallurgy and the carbonic productions. The method of production of hydrogen and the nanofibrous carbonic material includes decomposition of the hydrocarbon material at the heightened temperature on the catalyst containing nickel, copper and the hard-to-restore oxides. In the capacity of the hydrocarbon material use methane and decomposition is conducted at the temperature of 700-750°С or use the gaseous hydrocarbons with the monatomic ratio of hydrogen : carbon - within 2-3 and decomposition is conducted at the temperature of 500-600°С. The invention allows realization of the catalytic decomposition of the gaseous hydrocarbons with production of hydrogen and nanofibrous carbon.
EFFECT: the invention ensures realization of the catalytic decomposition of the gaseous hydrocarbons with production of hydrogen and nanofibrous carbon.
3 cl, 4 dwg, 1 tbl, 9 ex
FIELD: petrochemical process catalysts.
SUBSTANCE: invention relates to chemistry of heterogeneous catalysts and is directed to production of high-octane gasoline component via alkylation of isobutane with butane-butylene fraction on heterogeneous catalysts. Solid catalyst represents porous superacid based on zirconium and/or hafnium metallosilicates promoted with salts of double- or triple-charged metal cations with double-charged anions and depicted by general formula (EO2·aSiO2)·b(McXd) wherein E = Zr and/or Hf, a=17-34; b=0.5 when c=1 and d=1, M= Ni2+, Zn2+, or ZrO2+, X=SO4 2- or ZrF6 2-; or b=0.1666 when c=2 and d=3, M=Sc3+, Y3+, or Ga3+ and X= SO4 2-, parameter "a" being allowed to deviate from indicated value to larger or lesser side by 20% and parameter "b" by 5%. High-octane gasoline component is produced as indicated above at temperature 348 to 375 K, pressure 1.7 to 2.5 MPa, isobutane-to-butenes molar ratio 10-15, and volume feed supply velocity between 6.4 and 8.5 g/mL catalyst/h. Catalyst can optionally be regenerated.
EFFECT: enhanced conversion, yield of alkylate, productivity, and prolonged catalyst lifetime.
7 cl, 4 tbl, 11 ex