FIELD: chemistry.
SUBSTANCE: catalyst contains a substrate, a catalytic rhodium-containing layer and a catalytic platinum-containing layer. Described is a relationship between molar-average Pauling electronegativity X, which is calculated with respect to elements contained in the rhodium-containing catalytic layer, except platinum-group elements and oxygen, and the molar-average Pauling electronegativity Y, calculated with respect to elements contained in the platinum-containing catalytic layer, except platinum-group elements and oxygen. The following inequalities hold: 1.30≤X≤1.45 and 1.47≤Y≤2.0.
EFFECT: obtaining a catalyst for limiting spent gas emission with high efficiency of cleaning spent gases.
10 cl, 4 dwg, 3 tbl, 7 ex
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