FIELD: chemistry.
SUBSTANCE: described is a two-layer oxidation catalyst of slipped ammonia, a method for production thereof and a method of reducing concentration of ammonia in the stream of off-gas. Two-layer oxidation catalyst of slipped ammonia includes a selective catalytic reduction catalyst bed (SCR catalyst) and an oxidation catalyst layer. SCR catalyst layer contains a molecular sieve or vanadium/titanium dioxide, and the oxidation catalyst layer contains at least one first metal selected from a group consisting of copper (Cu), iron (Fe), cobalt (Co), nickel (Ni) and chromium (Cr), and a second metal which is manganese (Mn). Oxidation catalyst layer is placed closer to the substrate. Accelerated ammonia oxidation catalyst does not contain platinum group metal. Method of producing a two-layer catalyst includes: (a) forming a layer of said oxidation catalyst on a substrate by depositing on the catalyst layer a catalyst layer in the form of a porous coating, where the porous coating does not contain a platinum group metal, (b) drying the oxidation catalyst layer in the form of a porous coating on a substrate, (c) calcining the oxidation catalyst layer in the form of a porous coating on a substrate; (d) forming an SCR layer arranged on top of the oxidation catalyst layer by applying said SCR layer in form of a porous coating on top of the calcined oxidation catalyst layer formed at step (c), (e) drying the SCR layer in the form of a porous coating on a calcined layer of an oxidation catalyst on a substrate and (f) calcining the SCR layer in the form of a porous coating on the oxidation catalyst layer in the form of a porous coating on a substrate.
EFFECT: technical result is increase of efficiency of reduction of ammonia concentration in flow of off-gas.
31 cl, 4 dwg, 1 ex
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