CATALYST PREPARATION METHOD AND HYDROGEN OXIDATION CATALYST FOR APPARATUS FOR PASSIVE RECOMBINATION THEREOF Russian patent published in 2013 - IPC B01J37/25 B01J21/02 B01J35/10 B01J23/63 G21C9/06 

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 CaSiO₃ with 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 CaSiO₃ with 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 % Al₂O₃ modified as described above and having specific surface area of (120-140) m²/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