Regeneration of catalyst/absorber
DCFirst Claim
1. A method of regenerating a devitalized catalyst/absorber comprising an oxidation catalyst component selected from platinum, palladium, rhodium, cobalt, nickel, iron, copper, molybdenum or combinations thereof disposed on a high surface area support and an absorber material selected from a hydroxide, carbonate, bicarbonate or mixture thereof of an alkali or alkaline earth or mixtures thereof and having nitrogen oxides absorbed therein or thereon, said method comprising the steps of:
- providing a stream of regenerating gas comprising hydrocarbon and an inert carrier gas; and
passing said stream of regenerating gas over said devitalized catalyst/absorber for an effective time, at an effective temperature and at an effective space velocity to remove said nitrogen oxides from said devitalized absorber to form a regenerated catalyst/absorber.
5 Assignments
Litigations
1 Petition
Reexamination
Accused Products
Abstract
Hydrocarbon in a carrier of nitrogen or steam is passed over a devitalized supported noble metal/alkali or alkaline earth catalyst/absorber, such as Pt on an alumina monolith coated with potassium carbonate, which has sorbed NOx from engine exhaust to restore and regenerate the devitalized catalyst/absorber for reuse. The hydrocarbon undergoes a shift reaction to produce CO in situ which is the reactant gas for the regeneration.
46 Citations
16 Claims
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1. A method of regenerating a devitalized catalyst/absorber comprising an oxidation catalyst component selected from platinum, palladium, rhodium, cobalt, nickel, iron, copper, molybdenum or combinations thereof disposed on a high surface area support and an absorber material selected from a hydroxide, carbonate, bicarbonate or mixture thereof of an alkali or alkaline earth or mixtures thereof and having nitrogen oxides absorbed therein or thereon, said method comprising the steps of:
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providing a stream of regenerating gas comprising hydrocarbon and an inert carrier gas; and passing said stream of regenerating gas over said devitalized catalyst/absorber for an effective time, at an effective temperature and at an effective space velocity to remove said nitrogen oxides from said devitalized absorber to form a regenerated catalyst/absorber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification