Zirconia and sulfate in NOx traps to improved trapping and sulfu

Details Zirconia and sulfate in NOx traps to improved trapping and sulfu Zirconia and sulfate in NOx traps to improved trapping and sulfu

1996-11-29

1998-05-19

Tran, Hien

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422171, 60297, 502439, 502217, 502328, 502339, B01D 5334

Patent

active

057531927

ABSTRACT:
The invention is a nitrogen oxide trap comprising a porous support loaded with 6-15 wt. % strontium oxide and thereon, a mixture of: 0.5-5 wt. % precious metal catalyst selected from platinum, palladium, rhodium or mixtures thereof loaded, 3.5-15 wt. % zirconium and 15-30 wt. % sulfate, where preferably the ratio of zirconium to sulfate ranges from about 1:1 to 1:7; each wt. % being individually based on the weight of the support. The trap may be used in an internal combustion engine exhaust gas catalyst system. During lean-burn operation of the engine the trap sorbs nitrogen oxides (NOx) and releases the nitrogen oxides during decreased oxygen concentration in the exhaust gas, the desorbed NOx being converted to N.sub.2 and O.sub.2.

REFERENCES:
patent: 4771028 (1988-09-01), Arai et al.
patent: 5402641 (1995-04-01), Katoh et al.
patent: 5472673 (1995-12-01), Goto et al.

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