Title:
SOx耐性NOx捕捉触媒およびその製造方法および使用方法
Document Type and Number:
Japanese Patent JP2004505751
Kind Code:
A
Abstract:
The present invention relates to sulfur tolerant catalyst composites useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved NOx trap catalysts for use in diesel engines as well as lean burn gasoline engines. The sulfur tolerant NOx trap catalyst composites comprise a platinum component, a support, a NOx sorbent component, and a spinel material prepared by calcining as anionic clay material represented by the formula MmNn(OH)(2m+2n)Aa.bH2O, wherein the formula is defined herein. The sulfur tolerant NOx trap catalyst composites are highly effective with a sulfur containing fuel by trapping sulfur oxide contaminants which tend to poison conventional NOx trap catalysts used to abate other pollutants in the stream. The sulfur tolerant NOx trap catalyst composites are suitable for diesel engines because the composites can be regenerated at moderate temperatures with rich pulses, rather than at high temperatures.
Inventors:
Li, Yuejin
Application Number:
JP2002517194A
Publication Date:
February 26, 2004
Filing Date:
July 31, 2001
Export Citation:
Assignee:
ENGELHARD CORPORATION
International Classes:
F01N3/10; B01D53/86; B01D53/94; B01J23/00; B01J23/89; B01J37/02; B01J23/42; (IPC1-7): B01J23/89; B01D53/86; B01D53/94; B01J37/02; F01N3/10
Attorney, Agent or Firm:
Heikichi Odashima