FIELD: chemistry.SUBSTANCE: invention relates to methods of obtaining block catalysts, catalysts of purification of exhaust gases (EG) of combustion engines (CE). Described is method of preparing catalyst for CE EG purification, in which for application of intermediate coating and active phase used is water suspension, which includes aluminium hydroxide - boehmite (AlOOH), reducing disaccharide and soluble salts of Ce, Zr, Y, La in form of nitric acid salts in proportion required for formation in coating of tetragonal phase ZrCeO, stable in temperature range 500-1000°C and ratio in coating (MeO+ZrO+CeO):?-AlO-1:1, where - Me - Y, La, as well as one or several inorganic salts of platinum group metals, with thermal processing of coating being carried out simultaneously with reduction at temperature 550-1000°C. Obtained is catalyst for purification of exhaust gases of combustion engine with composition in wt %: AlO- 6,0-7,0, (MeO+ZrO+CeO), where - Me - Y, La, - 6.0-7.0, including content of MeO, where - Me - Y, La,- 0.35-0.5 wt %. Active phase, in terms of platinum group metals is 0.07-0.08 wt %. Block carrier constitutes the remaining part to 100 wt %. Specific surface of coating after TP: 500°C - 100-120 m/g, 800°C - 80-100 m/g, 1000°C - 60-70 m/g, 1200°C - 5-10 m/g.EFFECT: simplification of technology due to reduction of number of technological stages, time of their realisation, obtaining highly active and thermally stable catalyst.5 cl, 1 tbl, 4 dwg, 4 ex

Method of preparing catalyst for purification of exhaust gases of combustion engines and catalyst obtained thereof

FIELD: chemistrySUBSTANCE: invention relates catalysts and methods of producing said catalyst Described is a method of preparing a catalyst, involving pre-treatment of an inert block support made from Al-containing foil by calcining at temperature of (850-920)°C in an air current for (12-15) hours and depositing an intermediate coat on its surface at room temperature, said coat being modified aluminium oxide from a suspension containing aluminium hydroxide, aluminium nitrate, cerium nitrate, basalt flake from super-thin basalt fibre with elementary particle diameter of 1-3 mcm and length of up to 1000 mcm and water, heat treatment of the block with the intermediate coat in an air current and depositing one or more catalytically active platinum group metals, said suspension having the following ratio of components, wt %: aluminium hydroxide - (220-320), aluminium nitrate - (20-40), cerium nitrate - (30-70), basalt fibre - (13-35), water - up to 100; heat treatment of the block with the intermediate coat is carried out at temperature of (660-700)°C and ageing for (70-90) minutes Described is a catalyst prepared using the method described above, having a block metallic support, an intermediate coat of modified aluminium oxide and an active phase from platinum group noble metals deposited on the porous surface of the intermediate coat, containing (90-200) wt % modified AlO, having specific surface area of (120-140) m/g, containing aluminium oxide, cerium oxide, the modified aluminium oxide additionally containing basalt, with the following ratio of components, wt %: aluminium oxide (732-905), cerium oxide (52-138), basalt (43-130)EFFECT: catalyst with high mechanical strength and thermal stability is obtained2 cl, 2 tbl, 9 ex

Method of preparing catalyst and catalyst for oxidising and cleaning gases

FIELD: technological processes.SUBSTANCE: invention relates to methods of preparing a catalyst, for example, for oxidising ammonia and hydrocarbon-containing gases. Method of preparing catalyst includes preliminary thermal treatment of inert carrier in current of air or oxygen, successive application of intermediate coating from aluminum oxide and platinum on its surface and drying. Prior to thermal treatment, carrier surface is degreased. Intermediate coating of aluminum oxide is obtained with an aqueous solution of an aluminum salt of the following composition, wt%: nonahydrate aluminum nitrate 3.5–5.0; aqueous ammonia (25 % concentration) 1.4–1.8; gelling additive based on cellulose 0.25–0.35; surfactant 0.1–0.15; water – balance up to 100.EFFECT: invention is aimed at obtaining uniform coating of the surface of a carrier with reinforced adhesion, which increases working life of the catalyst, increases efficiency of production and reduces its cost.2 cl, 1 ex

Method of catalyst preparation

FIELD: chemistry.SUBSTANCE: invention relates to catalysts and production thereof. Described is a method of preparing a catalyst, which involves pre-treatment of an inert block support made from Al-containing foil by calcining at temperature of (850-920)°C in an air current for (12-15) hours, and then depositing onto its surface at room temperature an intermediate coating of modified aluminium oxide from a suspension which contains aluminium hydroxide, aluminium nitrate, zirconyl dihydrophosphate, lanthanum nitrate, zirconium oxide with predominant particle size of (1-3) mcm and microneedle-like wollastonite - natural calcium silicate CaSiOwith characteristic ratio 1:d=(12-20):1 with microneedle length 1<20 mcm and water; heat treatment of the block with the intermediate coating is carried out in an air current at temperature of (620-650)°C and ageing for (1.8-2.0) h; and subsequent deposition of one or more catalytically active platinum-group metals, followed by reduction in a hydrogen current at temperature of (350-400)°C and ageing for (5-6) h, wherein the intermediate coating is deposited from a suspension, having the following ratio of components, wt %: aluminium hydroxide (pseudo-boehmite) - (10.1-16.3), aluminium nitrate - (5.2-8.9), zirconium oxide - (8.3-18.7), zirconyl dihydrophosphate (0.3-0.8), lanthanum nitrate - (0.5-1.0) and microneedle-like wollastonite - natural calcium silicate CaSiOwith characteristic ratio 1:d=(12-20):1 with microneedle length l<20 mcm - (1.1-2.9), water - up to 100. Described is a catalyst which is prepared using said method, which includes a block metal support, an intermediate coating of modified aluminium oxide and an active phase of platinum-group noble metals deposited on the porous surface of the intermediate coating, said active phase containing (9-20) wt % AlOmodified as described above and having specific surface area of (120-140) m/g, wherein components of the coating are in the following weight ratio (%): aluminium oxide (38.4-61.0), zirconium oxide (30.0-55.7), lanthanum oxide (0.8-1.2), zirconyl dihydrophosphate (1.2-2.2), calcium silicate (3.1-7.4).EFFECT: high strength, water resistance and thermal stability of the obtained catalyst.2 cl, 2 tbl, 9 ex

Catalyst preparation method and hydrogen oxidation catalyst for apparatus for passive recombination thereof

FIELD: chemistry.SUBSTANCE: invention relates to the method of preparing a heat-resistant hydrophobic platinum catalyst for the low-temperature hydrogen oxidation reaction, including the application of platinum at room temperature from the impregnation solution of hexachlor-platinum acid HPtCl⋅6HO in the mixed solvent of acetone and mesityl oxide containing 10-90% of mesityl oxide, on the hydrophobic carrier granules γ-AlO, preliminary processed with the emulsion of dimethyl siloxane. After soaking in the impregnating solution, the carrier is dried and reduced with hydrogen. The pore size of the carrier granules is not less than 500 Ǻ.EFFECT: preservation of the hydrophobic properties and high catalytic activity of the catalyst at a temperature of not less than 573 K.2 cl, 3 dwg, 2 tbl, 3 ex

Method for preparing heat-resistant hydrophobic platinum catalyst for hydrogen oxidation reaction

FIELD: chemistry. ^ SUBSTANCE: invention concerns neutralisation catalysts for exhaust gas (EG) of internal combustion engines (ICE) and industrial effluent gas. Catalyst is obtained due to: 1) adding orthophosphoric acid to coating suspension to obtain alumophosphate, a binding substance, the total composition of which serves for coating reinforcement and thermal stabilisation of porous coating structure; 2) energy heterogeneity increase by adding zyrconyl dihydrophosphate to coating suspension, so that the total composition serves to enhance heat resistance of both modified aluminium oxide and catalytic contacts, i.e. of the whole catalyst. Invention claims method of catalyst preparation, involving preliminary processing of inert Al-containing foil block carrier by baking at 850-920°C in air flow for 12-15 hours, followed by carrier application onto intermediary modified aluminium oxide coating surface from suspension at room temperature, thermal processing of block with intermediary coating in air flow and further applying one or more active catalytic metals of platinum group. Intermediary coating is applied from suspension containing additionally orthophosphoric acid and zyrconyl dihydrophosphate at the following component ratio, wt %: aluminium hydroxide (pseudobemite) - 22-32, aluminium nitrite - 2-4, cerium nitrite - 2-5, orthophosphoric acid - 1-2, zyrconyl dihydrophosphate - 1-3, water - up to 100; thermal processing of block with intermediary coating is performed at 620-650°C with maturing for 1.8-2 hours. Invention also claims catalyst including metal block carrier, intermediary coating of modified aluminium oxide and active phase of noble metals of platinum group applied onto porous surface of intermediary coating. Catalyst includes 7-14 wt % of modified Al2O3 with specific surface area of 120-130 m2/g, which includes additionally aluminium phosphate and zyrconyl phosphate at the following weight ratio of coating components (%): aluminium oxide (89.7-71.4), cerium oxide - (3.5-9.7), aluminium phosphate - (3.6-8.1), zyrconyl dihydrophosphate - (3.2-10.9). ^ EFFECT: significant enhancement of mechanical and heat resistance of catalytic coating at high efficiency in waste gas treatment process, prolonged lifetime. ^ 2 cl, 2 tbl, 26 ex

Volkova Tat Jana Alekseevna

Papers

Method of catalyst preparation and catalyst for exhaust gas treatment in internal combustion engines