The method of preparation of the catalyst of co afterburning
(57) Abstract:Usage: in catalytic chemistry, in particular in methods for producing catalyst for the afterburning of carbon monoxide. The inventive method involves immersing molded workpiece from zhelezorudnogo composite (graphite content of 0.5-3 wt.%) in solution (-C3H5PtCl)4, (-C3H5PdCl)2, (-C3H5PdClPPh3) in a hydrocarbon solvent. The concentration of the solution is 6-10 g metal/L. After 20-30 min the workpiece is removed, dried at room temperature and calcined at 750-850°C in air atmosphere for 2-4 hours, the Concentration of sorbed metal in the surface layer is 510-6-2,510-5g metal /g composite. In the oxidation of carbon monoxide obtained catalyst provides the conversion of carbon monoxide 85-90 mol.%. 1 C.p. f-crystals, 1 table. The invention relates to the field of catalysis, in particular, to devices for afterburning of CO in the household burners and method of manufacturing such a device.For the last decades is the dramatic deterioration of the overall environmental situation due to increased emissions of combustion products into the atmosphere, uhusiano diesel fuels, when burned, which formed such a harmful and dangerous products, such as sulfur and nitrogen oxides, soot and carbon monoxide. The latter is especially dangerous because of the lack of smell and the color of his presence, especially in confined spaces may only be determined with the help of special instruments. Average daily maximum permissible concentration of carbon monoxide in dwellings should be 1 mg/m3, and the maximum single 6 mg/m3.Attempt to develop catalysts that promote more complete combustion of the fuel, and the reduction in the result, the CO content in the flue gases was done a long time ago. So, after tightening of the requirements for the composition of exhaust gases from internal combustion engines appeared catalysers of CO and other contaminants, which are designed to work on power installations, in particular for purifying exhaust gases of diesel engines. One of the tenets of such catalyst is applied on a solid, sometimes porous composite intermediate layer consisting of aluminum oxide, sometimes in mixtures with oxides of rare earth elements, which cause the catalytically active elements, such as platinum group metals.
FIELD: chemical industry, in particular method for production of value products from lower alkanes.
SUBSTANCE: claimed method includes passing of gaseous reaction mixture containing at least one lower alkane and elementary chlorine through catalytic layer. Used catalyst represents geometrically structured system comprising microfiber with diameter of 5-20 mum. Catalyst has active centers having in IR-spectra of adsorbed ammonia absorption band with wave numbers in region of ν = 1410-1440 cm-1, and contains one platinum group metal as active component, and glass-fiber carrier. Carrier has in NMR29Si-specrum lines with chemical shifts of -100±3 ppm (Q3-line) and -110±3 ppm (Q4-line) in integral intensity ratio Q3/Q4 from 0.7 to 1.2; in IR-specrum it has absorption band of hydroxyls with wave number of ν = 3620-3650 cm-1 and half-width of 65-75 cm-1, and has density, measured by BET-method using argon thermal desorption, SAr = 0.5-30 m2/g, and specific surface, measured by alkali titration, SNa = 10-250 m2/g in ratio of SAr/SNa = 5-30.
EFFECT: method of increased yield.
3 cl, 4 ex
FIELD: chemical industry, in particular method for production of value monomer such as vinylchloride.
SUBSTANCE: claimed method includes passing of reaction mixture containing dichloroethane vapor trough catalytic layer providing dehydrochlorination of dichloroethane to vinylchloride. Catalyst has active centers having in IR-spectra of adsorbed ammonia absorption band with wave numbers in region of ν = 1410-1440 cm-1, and contains one platinum group metal as active component, and glass-fiber carrier. Carrier has in NMR29Si-specrum lines with chemical shifts of -100±3 ppm (Q3-line) and -110±3 ppm (Q4-line) in integral intensity ratio Q3/Q4 from 0.7 to 1.2; in IR-specrum it has absorption band of hydroxyls with wave number of ν = 3620-3650 cm-1 and half-width of 65-75 cm-1, and has density, measured by BET-method using argon thermal desorption, SAr = 0.5-30 m2/g, and specific surface, measured by alkali titration, SNa = 10-250 m2/g in ratio of SAr/SNa = 5-30.
EFFECT: method with high conversion ratio and selectivity.
3 cl, 2 ex
FIELD: chemistry, in particular utilization of chlorine-containing waste.
SUBSTANCE: claimed method includes passing of organochlorine compound vapors blended with oxygen-containing reaction gaseous mixture through catalyst layer providing oxidation of starting organochlorine compounds. Said catalyst represents geometrically structured system from microfibers with length of 5-20 mum. Catalyst has active centers which are characterized by presence of absorption band in absorbed ammonia IR-spectrum with wave number ν = 1410-1440 cm-1; contains platinum group metal as active ingredient; and glass fiber carrier. Said carrier in NMR29Si-spectrum has lines with chemical shifts of -100±3 ppm (Q3-line) and -110±3 ppm (Q4-line) in integral intensity ratio of Q3/Q4 = 0.7-1.2; in IR-spectrum it has hydroxyl absorption band with wave number ν = 3620-1440 cm-1 and half-width of 65-75 cm-1; has specific surface, measured by BET using argon thermal absorption: SAr = 0.5-30 m2/g; surface area, measured by alkali titration: SNa = 10-250 m2/g, wherein SNa/SAr = 5-30.
EFFECT: selective oxidation of starting organochlorine compounds to safe and easily utilizing substances without toxic by-product formation.
3 cl, 4 ex
FIELD: precious metal technology.
SUBSTANCE: invention relates to a method for preparation of novel platinum-containing materials, which find always increasing demand in national economy, in particular in heterogeneous catalysis. According to invention, platinum is sublimated on high-temperature glass cloth with preliminarily deposited calcium oxide layer. Thus prepared material is a composite constituted by high-temperature glass cloth with deposited calcium oxide layer bearing (Ca,Si)O2 rods on its surface, said rods having oxidized platinum on their ends and metal particles 3-20 nm in size in underlayer.
EFFECT: enabled preparation of novel platinum-containing material with platinum in finely dispersed state.
7 cl, 1 dwg, 1 tbl, 6 ex
FIELD: industrial organic synthesis.
SUBSTANCE: invention is dealing with catalysts showing high catalytic stability in production of chloroform from carbon tetrachloride via catalytic dehydrochlorination reaction. Catalyst containing γ-alumina-supported platinum is characterized by that platinum in the form of particles 1 to 12 nm in size is distributed throughout the bulk of microspheric γ-alumina particles having median diameter 30 to 70 μm and pore volume 0.3 -0.6 cm3/g. Preparation of catalyst involves impregnation step accomplished via spraying γ-alumina with aqueous platinum compound solution used in amount equal to or less than alumina pore volume followed by platinum compound reduction step, wherein this compound is deposited onto γ-alumina with aqueous solution of formic acid or alkali metal formate.
EFFECT: achieved retention of high catalyst activity and selectivity over a long time period without being preliminarily activated.
9 cl, 2 tbl, 4 cl
FIELD: textile, paper and chemical industries; protection of environment in production of bleachers, biocides and components of oxidizing processes.
SUBSTANCE: proposed catalyst contains one or more metals of platinum group used as active component, one or more polyolefines and activated carbon carrier. It is preferably, that polyolefines have molecular mass above 400 and are selected from ethylene homopolymers and ethylene copolymers with alpha-olefines, propylene homopolymers and propylene copolymers with alpha olefines, butadiene homopolymers and copolymers with styrene and other olefines, isoprene homopolymers and copolymers with other olefines, ethylene-propylene copolymers, ethylene-propylene diolefine three-component copolymers, thermoplastic elastomers obtained from butadiene and/or isoprene and styrene block-copolymers, both hydrogenized and non-hydrogenized. Hydrogen peroxide is produced in presence of said catalyst from hydrogen and oxygen in reaction solvent containing halogenated and/or acid promoter. Proposed catalyst makes it possible to increase degree of conversion and selectivity of process, to obtain aqueous H2O2 solutions at content of acids and/or salts at level of trace amount.
EFFECT: enhanced efficiency.
48 cl, 1 tbl,18 ex