Catalyst and method for clarifying exhaust gas

Details Catalyst and method for clarifying exhaust gas Catalyst and method for clarifying exhaust gas

2008-07-29

2008-07-29

Wood, Elizabeth D. (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

C423S239200

Reexamination Certificate

active

07405175

ABSTRACT:
A proton type β zeolite is used as catalyst. Nitrogen oxides in the exhaust gas containing excessive oxygen is reduced/removed by making the exhaust gas contact with the catalyst under the existence of methanol and/or dimethyl ether as reducing agent. It is desirable that a SiO2/Al2O3molar ratio of the proton type β zeolite is within 20-70. Thereby, the present catalyst has an excellent denitration performance and durability even against the exhaust gas containing sulfur oxides, and the denitration performance does not deteriorate even when the exhaust gas is at comparatively low temperature of 300-400° C.

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