PURPOSE: To obtain a catalyst for catalytic reduction of NOx capable of efficient reduction of NOx in exhaust gas without using a large amt. of a reducing agent and excellent in durability even in the presence of moisture by carrying cerium oxide on a solid acid carrier.
CONSTITUTION: Cerium oxide is carried on a solid acid carrier to obtain the objective catalyst for catalytic reduction of NOx with hydrocarbon or an oxygen-contg. org. compd. as a reducing agent. The solid acid carrier is a carrier exhibiting solid acidity in a temp. region in which the catalyst is used. A zeolite type or oxide type solid acid carrier may be used as the solid acid carrier and the pref. amt. of the cerium oxide carried on the solid acid carrier is 5-80wt.% of the total amt. of them. The catalyst itself can be formed into one of various shapes such as a honeycomb or sphere shape by a known forming method.
SHIMIZU HIROMASU
YASUKAWA RITSU
MIYAMOTO KATSUMI
COSMO OIL CO LTD
SAKAI CHEMICAL INDUSTRY CO
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