Mixed-Metal Oxide de-NOx Catalyst Containing Highly Dispersed Noble Metals and Preparation thereof

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PURPOSE : A mixed-metal oxide de-NOx catalyst containing highly dispersed noble metals is provided that is capable of selectively removing NOx only from a mixed gas containing a large amount of poisoning components, and a preparation method of the mixed-metal oxide de-NOx catalyst containing highly dispersed noble metals is provided. CONSTITUTION : A preparation method of a mixed-metal oxide de-NOx catalyst containing highly dispersed noble metals comprises : a first step of preparing a zeolite support catalyst(A) by dipping a zeolite support containing an alkali metal into a noble metal solution, thereby ion exchanging the zeolite support containing an alkali metal; a second step of preparing a layered inorganic oxide support catalyst(B) between layers of which a mixed metal oxide is deposited by dipping a layered inorganic oxide support into a mixed metal oxide solution of an alkali earth metal oxide and a rare earth metal oxide; and a third step of mixing the zeolite support catalyst(A) with the layered inorganic oxide support catalyst(B) in a weight ratio of 1 : 01 to 4, firing the mixture in an oxygen atmosphere and heat-treating the fired mixture in a nitrogen atmosphere to prepare a de-NOx catalyst. © KIPO 2006