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HYDROTHERMALLY STABLE METAL PROMOTED ZEOLITE BETA FOR NOX REDUCTION
HYDROTHERMALLY STABLE METAL PROMOTED ZEOLITE BETA FOR NOX REDUCTION
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机译:降低NOx的水热稳定金属促进分子筛
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摘要
The present invention is directed to an iron-promoted zeolite beta catalyst useful in the selective catalytic reduction of nitrogen oxides with ammonia in which the iron-promoted zeolite beta is treated so as to provide increased amounts of the iron promoter in the form of Fe(OH).;The stabilized zeolite is formed by cation exchange of an iron salt into a zeolite beta which has a reduced sodium content such as by exchanging a sodium beta with ammonium or hydrogen cations. A zeolite beta having a reduced carbon content and a Si/Al ratio of no more than 10 also increases the Fe(OH) content of the iron-promoted catalyst. The iron-promoted catalyst has the iron in the form of Fe(OH).
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