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Titolo:
The chemistry of sulfoxy species on clean, oxygenated, and caesiated Ag{100}: A study of surface reactivity by fast XPS and TPR
Autore:
Santra, AK; Bird, DPC; Sykes, ECH; Williams, FJ; Goldoni, A; Baraldi, A; Lambert, RM;
Indirizzi:
Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England Univ Cambridge Cambridge England CB2 1EW hem, Cambridge CB2 1EW, England Sincrotrone Trieste, I-34012 Trieste, Italy Sincrotrone Trieste Trieste Italy I-34012 rieste, I-34012 Trieste, Italy INFM Lab, TASC, I-34012 Trieste, Italy INFM Lab Trieste Italy I-34012INFM Lab, TASC, I-34012 Trieste, Italy Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy Univ Trieste Trieste Italy I-34127 artimento Fis, I-34127 Trieste, Italy
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 41, volume: 105, anno: 2001,
pagine: 10062 - 10068
SICI:
1520-6106(20011018)105:41<10062:TCOSSO>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SULFUR-DIOXIDE; ETHYLENE EPOXIDATION; SELECTIVE OXIDATION; SO2 ADSORPTION; ALKALI-METAL; CS; PT(111); SILVER; SPECTROSCOPY; PROMOTERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Lambert, RM Univ Cambridge, Dept Chem, Lensfield Rd, Cambridge CB2 1EW, England Univ Cambridge Lensfield Rd Cambridge England CB2 1EW England
Citazione:
A.K. Santra et al., "The chemistry of sulfoxy species on clean, oxygenated, and caesiated Ag{100}: A study of surface reactivity by fast XPS and TPR", J PHYS CH B, 105(41), 2001, pp. 10062-10068

Abstract

High-resolution XPS, including time- and temperature-dependent measurements, and temperature-programmed reactions, including O-18 isotope mixing studies, have been used to study the sulfoxy species formed on Ag-{100} in the absence and presence of Cs. On the alkali-free preoxygenated surface, SO2 adsorbs to form a surface sulfite which decomposes at similar to 460 K releasing gaseous SO2 and dissolved oxygen. Cs induces the formation of a more strongly bound alkali sulfite which reacts further to form alkali sulfate. The alkali sulfite and sulfate decompose at similar to 525 and similar to 575 K, respectively, releasing gaseous SO2, dissolved oxygen, and a small amount of adsorbed sulfur. Isotope mixing data indicate that the sulfoxy species formed in the presence of alkali have a higher bond order with the Ag surface than the sulfite formed on the alkali-free surface. All these speciesare labile with respect to oxygen release in the temperature regime relevant to oxyanion-promoted ethene epoxidation, and a reaction scheme is proposed that accounts for their formation, interconversion, and decomposition.

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Documento generato il 05/04/20 alle ore 06:15:57