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Titolo:
IN-SITU STUDIES OF CATALYSTS UNDER REACTION CONDITIONS BY TOTAL ELECTRON-YIELD XAS - POSSIBILITIES AND LIMITATIONS OF A NEW EXPERIMENTAL-TECHNIQUE
Autore:
SCHROEDER SLM; MOGGRIDGE GD; CHABALA E; ORMEROD RM; RAYMENT T; LAMBERT RM;
Indirizzi:
UNIV CAMBRIDGE,DEPT CHEM,LENSFIELD RD CAMBRIDGE CB2 1EW ENGLAND MAX PLANCK GESELL,FRITZ HABER INST,ABT ANORGAN CHEM D-14195 BERLIN GERMANY UNIV CAMBRIDGE,DEPT CHEM ENGN CAMBRIDGE CB2 3RA ENGLAND UNIV KEELE,DEPT CHEM KEELE ST5 5BG STAFFS ENGLAND
Titolo Testata:
Faraday discussions
fascicolo: 105, , anno: 1996,
pagine: 317 - 336
SICI:
1359-6640(1996):105<317:ISOCUR>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-ABSORPTION; SCANNING TUNNELING MICROSCOPY; FINE-STRUCTURE SPECTROSCOPY; MULTIPLE-SCATTERING; XAFS MEASUREMENTS; CARBON-DIOXIDE; THIN-FILMS; EXAFS; SURFACE; ADSORPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
62
Recensione:
Indirizzi per estratti:
Citazione:
S.L.M. Schroeder et al., "IN-SITU STUDIES OF CATALYSTS UNDER REACTION CONDITIONS BY TOTAL ELECTRON-YIELD XAS - POSSIBILITIES AND LIMITATIONS OF A NEW EXPERIMENTAL-TECHNIQUE", Faraday discussions, (105), 1996, pp. 317-336

Abstract

Total electron-yield (TEY) detection has long been regarded a method for XAS investigations of surface adsorbates under ultra-high vacuum conditions. Recent work has shown, however, that the technique can alsobe applied to in situ studies of catalysts under reaction conditions. We have thoroughly investigated the TEY signal formation process under gas-flow conditions with a view to (i) characterizing the surface sensitivity of the technique, (ii) assessing the accuracy of the information acquired, and (iii) establishing the practical possibilities and limitations of true in situ measurements at elevated pressures and temperatures. We conclude that the technique opens up new possibilities particularly for XAS investigations of unsupported and/or concentrated materials that were hitherto difficult to study by other XAS detectiontechniques. In situ TEY detection is most promising for studies with medium and hard X-rays (E > 3 keV), which penetrate the gaseous environment of catalytic reactors most readily. Data are presented for iodine monolayers on Au(111): these show that monolayer studies are, in principle, possible, but represent the present limit of the technique in the medium and hard X-ray ranges. Results for a Cu-based catalyst for the synthesis of methanol are discussed to demonstrate what information can be achieved by the technique.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 00:43:35