发明名称 |
Exhaust gas cleaning method, exhaust gas cleaning catalyst and exhaust gas cleaning device for internal combustion engine |
摘要 |
<p>The present invention provides a method, device and catalyst to remove nitrogen oxides contained in the exhaust gas of lean-burn automobiles at a high efficiency. NOx and CO adsorbent components are contained in the exhaust gas cleaning catalyst which captures NOx when the air-fuel ratio of exhaust gas is higher than theoretical air-fuel ratio and reduces said captured NOx when the air-fuel ratio of exhaust gas is equal to or smaller than theoretical air-fuel ratio. Said catalyst is placed in the exhaust gas path; said catalyst characterized in that the maximum CO desorption temperature reaches 200 to 220 DEG C when the temperature is raised in He gas flow at the rate of 5 to 10 DEG C/min after CO has been adsorbed by saturation at 100 DEG C; wherein exhaust gas having an air-fuel ratio higher than theoretical air-fuel and exhaust gas having an air-fuel ratio equal to or smaller than theoretical air-fuel ratio are alternately made to flow to said catalyst. <IMAGE></p> |
申请公布号 |
EP1020217(A2) |
申请公布日期 |
2000.07.19 |
申请号 |
EP20000100185 |
申请日期 |
2000.01.13 |
申请人 |
HITACHI, LTD. |
发明人 |
IIZUKA, HIDEHIRO;OKUDE, KOJIRO;KANEEDA, MASATO;NAGAYAMA, KOUSEI;YAMASHITA, HISAO;KURODA, OSAMU;KITAHARA, YUICHI |
分类号 |
F01N9/00;B01D53/94;B01J21/06;B01J23/00;B01J23/56;B01J23/58;F01N3/08;F01N3/10;F01N3/20;(IPC1-7):B01D53/94 |
主分类号 |
F01N9/00 |
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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