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Titolo:
DEPENDENCE OF CATALYST DETERIORATION ON T HE NOBLE-METALS IN 3-WAY CATALYST FOR NATURAL GAS-FUELED ENGINES
Autore:
TABATA T; BABA K; OKADA O;
Indirizzi:
OSAKA GAS CO LTD,FUNDAMENTAL RES LABS,KONOHANA KU,6-19-9 TORISHIMA OSAKA 554 JAPAN OSAKA GAS CO LTD,CTR RES & DEV,KONOHANA KU OSAKA 554 JAPAN
Titolo Testata:
Nippon kagaku kaishi
fascicolo: 3, , anno: 1995,
pagine: 225 - 231
SICI:
0369-4577(1995):3<225:DOCDOT>2.0.ZU;2-X
Fonte:
ISI
Lingua:
JPN
Soggetto:
SURFACE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
6
Recensione:
Indirizzi per estratti:
Citazione:
T. Tabata et al., "DEPENDENCE OF CATALYST DETERIORATION ON T HE NOBLE-METALS IN 3-WAY CATALYST FOR NATURAL GAS-FUELED ENGINES", Nippon kagaku kaishi, (3), 1995, pp. 225-231

Abstract

The deterioration of three way catalysts for the reduction of NO, from the exhaust of natural gas-fueled engine cogeneration systems was studied using the analyses of used catalysts and accelerated tests of trial catalysts which contain a variety of species and amounts of noble metals. The results show that the catalysts for gasoline-fueled automobiles do not have sufficient activity of methane oxidation after a couple of thousands hours operation, the window in which NOx and CO are simultaneously converted shifts to a rich air/fuel (A/F) ratio, though the window still exists. This means that NOx is not removed at the controlled A/F ratio. The results of the tests using artificially deteriorated catalysts clarified that the deterioration is caused by the sintering of noble metals. Further, from the experiments varying species and amounts of noble metals, it was also proven that Pt plays an essential role in methane oxidation and that the shift of the window can be suppressed by maintaining the surface area of Pt with increases in Pt amounts and in the Pt/Rh ratio. Besides, the increase in Pt amount contributed to an increase in the oxygen storage capacity of the catalystdue to CeO2 and enabled operation under dynamic A/F control for a long time.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/08/20 alle ore 23:16:54