Process for rejuvenating automobile emission control catalysts

A method for the rejuvenation of an automobile emission control catalyst poisoned with compounds of lead and/or phosphorus comprising (a) initially extracting lead sulfate deposits from the catalyst with an aqueous ammonium salt (preferrably ammonium acetate) solution; (b) exposing the catalyst to a...

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Bibliographische Detailangaben
Hauptverfasser:	MCARTHUR, DENNIS P
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	A method for the rejuvenation of an automobile emission control catalyst poisoned with compounds of lead and/or phosphorus comprising (a) initially extracting lead sulfate deposits from the catalyst with an aqueous ammonium salt (preferrably ammonium acetate) solution; (b) exposing the catalyst to an atmosphere containing SO2, or SO2 and air, at 300 DEG to 700 DEG C. until other lead compounds are substantially converted to lead sulfate, and phosphorus compounds are substantially converted to gaseous P2O5; and finally (c) removing at least a portion of the lead sulfate formed in (b) by a second extraction with an aqueous ammonium salt solution.