METHOD OF PREPARING SUPPORTED PALLADIUM CATALYSTS Russian patent published in 2006 - IPC B01J23/44 B01J37/02 B01J27/24 

FIELD: reduction-oxidation catalysts.

SUBSTANCE: invention relates to catalytic chemistry and, in particular, to preparation of deep-oxidation supported palladium catalysts, suitable, for example, in afterburning of motor car exhaust. Preparation involves depositing palladium from aqueous solution of palladium precursors followed by drying and calcination. Precursors are selected from nitrite anionic or cationic palladium complexes [Pd(NO₂ ^-)(H₂O)₃]An_x or [Pd(NO₂ ^-)_n(H₂O)_m](Kat)_y, wherein An are anions of acids containing no chloride ions, Kat is proton or alkali metal cation, n=3-4, m=0-1, x=1-2, and y=1-2. Nitrite ions are introduced into impregnating solution in the form of nitrous acid salts or are created in situ by reducing nitrate ions or passing air containing nitrogen oxides through impregnating solution. Ratio [Pd]/[NO₂ ^-] in impregnating solution is selected within a range 1:1 to 1:4.

EFFECT: eliminated chlorine-containing emissions, increased stability of chlorine-free impregnating solutions, reduced their acidity and corrosiveness, and increased catalytic activity in deep oxidation reactions.

2 cl, 1 tbl, 16 ex