Exhaust gas purifying catalyst and process for purifying exhaust gas
AssigneesICT Co., Ltd., International Catalyst Technology, Inc.
InventorsTakeshi Matsumoto, Takao Kobayashi, Takuji Nakane, Takahiro Uno, Makoto Horiuchi
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Abstract
An exhaust gas purifying catalyst contains copper oxide, ZSM-5 and/or zeolite β, and an oxide of magnesium and/or calcium is further added thereto. A process for purifying an exhaust gas using such a catalyst is also included. By using the catalyst, NOx in an exhaust gas containing much oxygen such as exhaust gas of diesel engines can be efficiently removed and oxidation of SO2 under high-temperature conditions can be suppressed.
Claims12
A catalyst for purifying exhaust gases, comprising a catalyst component containing copper oxide, a mixture of ZSM-5 zeolite and zeolite β, and an oxide of magnesium, wherein a mass ratio of ZSM-5 zeolite to zeolite β is in the range of 1:1 to 10:1.
Dependencies are inferred from the claim text.