发明名称 |
HYDROTHERMALLY STABLE METAL PROMOTED ZEOLITE BETA FOR NOX REDUCTION |
摘要 |
The present invention is directed to a metal-promoted zeolite beta catalyst useful in the selective catalytic reduction of nitrogen oxides with ammonia in which the zeolite beta is pre-treated so as to provide the zeolite with improved hydrothermal stability. The stabilized beta zeolite is provided by incorporating into the zeolite structure non-framework aluminum oxide chains. The aluminum oxide chains can be incorporated into the zeolite structure by a unique steaming regimen or by treatment with rare earth metals, such as cerium. The treatment process is unlike well-known methods of dealuminizing zeolites for the purpose of increasing the silica to alumina ratio. In the present invention, the non-framework aluminum oxide is characterized by FT-IR by a peak at 3781+2 cm-1, which when present, stabilizes the zeolite against further dealumination such as under oxidizing and harsh hydrothermal conditions.
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申请公布号 |
CA2428139(A1) |
申请公布日期 |
2002.05.30 |
申请号 |
CA20012428139 |
申请日期 |
2001.10.31 |
申请人 |
ENGELHARD CORPORATION |
发明人 |
TRAN, PASCALINE H.;FURBECK, HOWARD;LIU, XINSHENG;CHEN, JAMES M.;LAPADULA, GERARD D. |
分类号 |
B01D53/94;B01D53/86;B01D53/90;B01J29/06;B01J29/08;B01J29/18;B01J29/40;B01J29/50;B01J29/70;B01J29/76;B01J35/00;B01J37/02;C01B39/46;(IPC1-7):B01J29/072;B01J29/14;B01J29/24;B01J29/46;B01J29/56 |
主分类号 |
B01D53/94 |
代理机构 |
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