SULFUR RESISTANT NOX TRAP HIGHLY CHARGED WITH SODIUM OR POTASSIUM

PROBLEM TO BE SOLVED: To increase resistance to poisoning by a sulfur in waste gas of an internal combustion engine by forming a NOx trap from a specified wt.% platinum and sodium. potassium or their mixture with a significantly many sodium or potassium incorporated more than conventional amount. SO...

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Bibliographische Detailangaben
Hauptverfasser:	HEPBURN JEFFREY SCOTT, WATKINS WILLIAM LEWIS HENDERSON
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 CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To increase resistance to poisoning by a sulfur in waste gas of an internal combustion engine by forming a NOx trap from a specified wt.% platinum and sodium. potassium or their mixture with a significantly many sodium or potassium incorporated more than conventional amount. SOLUTION: The NOx trap for the waste gas of the internal combustion engine is constituted by incorporating a porous supporting body impregnated with an alkali metal selected among sodium, potassium and their mixture and platinum. A thin coated film such as alumina is applied on a substrate, and after drying and burning the film, each catalyst of sodium or potassium and platinum is stuck and charged by an impregnating method, etc., on the coated film by at least 30wt.% alkali metal and 0.2-4wt.% platinum to porous supporting body weight, and the NOx trap is obtained by drying and burning the material in air. In such a way, the poisoning due to the sulfur is markedly overcome, and a NOx capturing efficiency of this catalyst is maintained.