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Titolo:
ACTIVE-SITE DENSITY AND REACTIVITY FOR THE PHOTOCATALYTIC DEHYDROGENATION OF 2-PROPANOL AN TIO2 (110)
Autore:
BRINKLEY D; ENGEL T;
Indirizzi:
UNIV WASHINGTON,DEPT CHEM,BOX 351700 SEATTLE WA 98195
Titolo Testata:
Surface science
fascicolo: 3, volume: 415, anno: 1998,
pagine: 1001 - 1006
SICI:
0039-6028(1998)415:3<1001:ADARFT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELATIVE PHOTONIC EFFICIENCIES; ALIPHATIC-ALCOHOLS; SURFACE-DIFFUSION; MOLECULAR-BEAM; DESORPTION; KINETICS; ADSORPTION; TIO2(110); TITANIA; PT(111);
Keywords:
ALCOHOLS; ALKENES; ATOM-SOLID SCATTERING AND DIFFRACTION-INELASTIC; CHEMISORPTION; COMPOUND FORMATION; KETONES; LOW INDEX SINGLE-CRYSTAL SURFACES; PHOTOCHEMISTRY; SURFACE CHEMICAL REACTIONS; SURFACE PHOTOCHEMISTRY; TITANIUM OXIDE;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
D. Brinkley e T. Engel, "ACTIVE-SITE DENSITY AND REACTIVITY FOR THE PHOTOCATALYTIC DEHYDROGENATION OF 2-PROPANOL AN TIO2 (110)", Surface science, 415(3), 1998, pp. 1001-1006

Abstract

By combining molecular beam experiments at 350 K with low temperatureexperiments on an immobile adlayer, we determine the fraction of surface sites active for the photocatalytic dehydrogenation of 2-propanol to acetone to be 0.08 on a fully oxidized surface. We also find that the reaction probability at these sites is essentially unity. The presence of oxygen vacancies (approximate to 0.1 monolayer) increases the fraction of active sites to 0.15 without changing the reaction probability, reaction kinetics, or product distribution. From this, we conclude that only sites which can bind O-2 strongly are active for the reaction. Candidates for such sites include steps and kinks on fully oxidized surfaces and oxygen lattice vacancies on reduced surfaces. (C) 1998Elsevier Science B.V. All rights reserved.

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Documento generato il 29/03/20 alle ore 01:16:29