Title:
ENHANCED SULFUR OXIDE/NITROGEN OXIDE TRAP FOR PROTECTING NITROGEN OXIDE STORAGE-REDUCTION CATALYST FROM SULFUR POISONING
Document Type and Number:
Japanese Patent JP2014138927
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To develop an enhanced exhaust gas purification system for a combustion source, including a hydrogen generation system, a sulfur oxide trap, and nitrogen storage-reduction (NSR) catalyst trap and an enhanced exhaust gas purification method.SOLUTION: A water-gas shift catalyst is arranged between a sulfur oxide trap and an NSR catalyst trap and a purification catalyst is arranged downstream of the NSR catalyst trap. Furthermore, a sulfur trap regenerable at an intermediate temperature rather than a high temperature by a rich pulse is arranged. Sulfur emitted from the sulfur trap is passed through the nitrogen oxide trap without or with hardly poisoning NOocclusion and reduction points. This is appropriate for substantially improving a life and a performance of the NSR catalyst trap, satisfying a future exhaust standard, and for use in an internal combustion engine operating at a lean gas-fuel ratio in almost all operation periods.
Inventors:
WEISSMAN WALTER
EL MEKKI EL MALKI
EL MEKKI EL MALKI
Application Number:
JP2013249736A
Publication Date:
July 31, 2014
Filing Date:
December 03, 2013
Export Citation:
Assignee:
EXXONMOBIL RES & ENG CO
International Classes:
B01D53/94; B01D53/50; B01D53/81; B01D53/86; B01J23/10; B01J23/34; B01J23/63; B01J23/78; B01J23/89; F01N3/023; F01N3/035; F01N3/08; F01N3/10; F01N3/20; F01N3/24
Domestic Patent References:
| JPH11169708A | 1999-06-29 | |||
| JP2000297671A | 2000-10-24 | |||
| JPH07259542A | 1995-10-09 | |||
| JP2001516835A | 2001-10-02 | |||
| JPH11350945A | 1999-12-21 |
Foreign References:
| US7389638B2 | 2008-06-24 | |||
| US6745560B2 | 2004-06-08 |
Attorney, Agent or Firm:
Kenji Kawabi
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