发明名称 |
Catalyst for treatment of diesel exhaust particulate. |
摘要 |
<p>A preferred catalytically-active solid acid material, zeolite, forms the basis of a washcoat effective for treating diesel-fuelled engine exhaust to reduce emission of particulate material therein. In a preferred method, hydrocarbons present in the exhaust are cracked and oxidised in the presence of a zeolite/silica washcoat mixture catalyst-coated with precious metal. A preferred Y-type zeolite provides acidic (cationic) sites having releasable cations which are exchanged with precious metal to form catalyst-coated zeolite. A preferred method of making the catalyst-coated zeolite/silica washcoat is provided, whereby colloidal silica is disposed as a barrier over the catalyst-coated washcoat, limiting the exposure of the catalyst metal in the washcoat to sulphur constituents in the exhaust.</p> |
申请公布号 |
EP0596552(A1) |
申请公布日期 |
1994.05.11 |
申请号 |
EP19930202919 |
申请日期 |
1993.10.18 |
申请人 |
GENERAL MOTORS CORPORATION |
发明人 |
BECKMEYER, RICHARD FREDERICK;TSANG, CHIH-HAO MARK |
分类号 |
B01D53/94;B01J23/40;B01J29/08;B01J37/02;F02B3/06;(IPC1-7):B01J37/02;B01J29/06 |
主分类号 |
B01D53/94 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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