发明名称 |
NOx trapping by metal-zirconia materials during lean-burn automotive engine operation |
摘要 |
The invention is a method for treating exhaust gas containing carbon monoxide, hydrocarbons, and nitrogen oxides generated by a lean burn internal combustion engine. It includes bringing the exhaust gas into contact with a particular metal-zirconium oxide material made by sol-gel processing and which includes at least 0.1 wt. % precious metal. The alkoxides include heterometallic alkoxides containing zirconium and alkali metal or alkaline earth metal. Optionally the oxide may contain a lanthanide metal. Under lean-burn conditions nitrogen oxides are absorbed on the oxide and when the oxygen concentration is lowered the absorbed nitrogen oxide are desorbed and reduced over the precious metal.
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申请公布号 |
US6139813(A) |
申请公布日期 |
2000.10.31 |
申请号 |
US19980216459 |
申请日期 |
1998.12.18 |
申请人 |
FORD GLOBAL TECHNOLOGIES, INC. |
发明人 |
NARULA, CHAITANYA KUMAR;NAKOUZI-PHILLIPS, SABINE RITA |
分类号 |
B01D53/56;B01D53/94;B01J20/02;B01J21/06;B01J23/40;B01J23/58;B01J23/63;B01J37/03;F01N3/08;F01N3/10;F01N3/28;(IPC1-7):B01J8/02 |
主分类号 |
B01D53/56 |
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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