PURPOSE: To obtain a catalyst applicable to a catalytically reductive denitration method of ammonia for suppressing N2O as a byproduct, by constituting the same from one prepared by supporting oxide of one or more of a metal element selected from Mn, Co, Cr and Cu by a carrier.
CONSTITUTION: The titled catalyst is constituted of one prepared by supporting oxide of one or more of a metal element selected from a group comprising Mn, Co, Cr and Cu by a carrier. Powders comprising oxides of these metal elements are mixed in a dry or a wet system and the resulting mixture is dried, molded and baked to obtain an objective catalyst. Thus obtained catalyst can preliminarily convert NO2 contained in exhaust gas to NO in good efficiency in a denitration process due to catalytic reduction for ammonia and, as the result, the generation of N2O as a byproduct in denitration reaction is suppressed and a denitration process for NO2-containing gas can be realized in a high denitration ratio.
KONISHI KUNIHIKO
OOTA MASAO
TAKIMOTO YOSHINORI
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