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Titolo:
XPS study of ceramic three-way catalysts
Autore:
Battistoni, C; Cantelli, V; Debenedetti, M; Kaciulis, S; Mattogno, G; Napoli, A;
Indirizzi:
CNR, Inst Mat Chem, I-00016 Monterotondo, Italy CNR Monterotondo Italy I-00016 nst Mat Chem, I-00016 Monterotondo, Italy Fiat Res Ctr, I-10043 Orbassano, Italy Fiat Res Ctr Orbassano Italy I-10043 t Res Ctr, I-10043 Orbassano, Italy
Titolo Testata:
APPLIED SURFACE SCIENCE
, volume: 145, anno: 1999,
pagine: 390 - 394
SICI:
0169-4332(199904)145:<390:XSOCTC>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Keywords:
X-ray photoelectron spectroscopy; thermal desorption spectroscopy; ceramics; catalysis; surface segregation; chemisorption;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Kaciulis, S CNR, Inst Mat Chem, POB 10, I-00016 Monterotondo, Italy CNR POB 10 Monterotondo Italy I-00016 016 Monterotondo, Italy
Citazione:
C. Battistoni et al., "XPS study of ceramic three-way catalysts", APPL SURF S, 145, 1999, pp. 390-394

Abstract

Three-way catalysts used in automotive exhaust converters were investigated by means of selected-area XPS. The main purpose of this study was to improve the understanding of deactivation processes occurring when the catalystis operating in gas exhaust. The washcoat of the converter (gamma-alumina with ceria and other stabilising additives) was supported on a honeycomb monolith of cordierite. Catalysts (Pd and Rh) were doped in the washcoat surface. The samples of the new converter and the same converter after various treatments were analysed. From the characteristic shape and chemical shift of the XPS peaks, the chemical state of the active elements (Ce, La, Ba, Pd, Rh) and the contaminants (P, Pb, Zn, Ca, etc.) was determined before and after the sample treatments. These results together with the data of quantitative XPS testified that, after the medium operation time of 500 h, the gas converter was deteriorated. The main reasons and the consequences of thisdegradation are revealed. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 20:23:21