Multifunctional catalyst for hydrocarbon oxidation and selective catalytic reduction of NOx

A process for preparing a catalyst for the oxidation of hydrocarbon and the selective catalytic reduction of nitrogen oxides comprising:

• (a) providing a substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end, and a plurality of passages defined by internal walls of the substrate extending therethrough;
• (b) providing one or more mixtures comprising a source of a platinum group metal component, particles of a first oxidic material, water, particles of a mixed oxide of vanadium and one or more of iron, erbium, bismuth, cerium, europium, gadolinium, holmium, lanthanum, lutetium, neodymium, praseodymium, promethium, samarium, scandium, terbium, thulium, ytterbium, yttrium, molybdenum, tungsten, manganese, cobalt, nickel, copper, aluminum and antimony, a second oxidic material and preferably an oxidic binder,
• disposing the one or more mixtures over z % of the substrate axial length, wherein z ranges from 90 to 100, wherein disposing the one or more mixtures includes:
• disposing a bottom coat on the surface of the internal walls of the substrate over x % of the substrate axial length, wherein x ranges from 90 to 100, and the bottom coat comprises the mixed oxide supported on the second oxidic material;
• and
• disposing a top coat on the bottom coat over y % of the substrate axial length, wherein y ranges from 90 to 100, and the top coat comprises the platinum group metal component supported on the first oxidic material, wherein the bottom coat is disposed on, and
• calcining the one or more mixtures disposed on the substrate.