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公开(公告)号:US5997830A
公开(公告)日:1999-12-07
申请号:US874484
申请日:1997-06-13
申请人: Takashi Itoh , Yukio Kosaki , Kazuhiko Shiokawa
发明人: Takashi Itoh , Yukio Kosaki , Kazuhiko Shiokawa
CPC分类号: B01D53/945 , B01D53/9418 , B01D53/9472 , B01J23/468 , B01J35/0006 , B01D2251/208 , B01D2255/1021 , B01D2255/1028 , B01D2255/9202 , B01D2255/9207 , Y02C20/10 , Y02T10/22 , Y02T10/24
摘要: This method comprises bringing exhaust gas from an internal combustion engine, which is operated at a fuel-lean air/fuel ratio, in contact with an iridium-containing catalyst in a first zone and then in contact with a platinum-containing catalyst in a second zone situated downstream of the first zone. This method is effective for exhaust gas from lean burn engines over a wide temperature range of 200 to 500.degree. C., produces less N.sub.2 O in a low-temperature range of 200 to 300.degree. C., and can purify exhaust gas stably and effectively even at a high temperature of 700.degree. C. or over.
摘要翻译: 该方法包括将来自内燃机的废气以无燃料的空气/燃料比操作,与第一区域中的含铱催化剂接触,然后在第二区域中与含铂催化剂接触 区位于第一区的下游。 该方法对于在200〜500℃的宽温度范围内的贫燃发动机的废气有效,在200〜300℃的低温范围内产生较少的N2O,甚至可以均匀地净化排气 在700℃以上的高温下。
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公开(公告)号:US5358916A
公开(公告)日:1994-10-25
申请号:US062196
申请日:1993-05-17
申请人: Kazuhiko Shiokawa , Takashi Itoh
发明人: Kazuhiko Shiokawa , Takashi Itoh
IPC分类号: B01D53/94 , B01J29/06 , B01J29/072 , B01J29/24 , B01J29/42 , B01J29/44 , B01J29/46 , B01J29/76 , B01J37/02 , B01J29/10 , B01J29/20
CPC分类号: B01J37/0246 , B01D53/9418 , B01J29/061 , B01J29/76 , B01D2255/102 , B01D2255/2063 , B01D2255/2065 , B01D2255/20761 , B01D2255/30 , B01D2255/504
摘要: A catalyst for purifying exhaust gas, comprising a zeolite carrier having a mole ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of from 20 to 200, and a compound oxide of copper and silicon supported on the carrier. The catalyst has high activity for elimination of nitrogen oxides (NO.sub.x) even in the presence of both oxygen and water vapor, and also has excellent durability at high temperatures. The catalyst is therefore effective in eliminating nitrogen oxides from exhaust gases from automobiles, boilers and the like.
摘要翻译: 一种用于净化废气的催化剂,其包含SiO 2 / Al 2 O 3的摩尔比为20〜200的沸石载体和负载在载体上的铜和硅的复合氧化物。 即使在氧气和水蒸气的存在下,催化剂也具有高的消除氮氧化物(NOx)的活性,并且在高温下也具有优异的耐久性。 因此,催化剂有效地从汽车,锅炉等的废气中除去氮氧化物。
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