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Titolo:
Interaction of HCOOH with stoichiometric and reduced SrTiO3(100) surfaces
Autore:
Wang, LQ; Ferris, KF; Herman, GS; Engelhard, MH;
Indirizzi:
Battelle Mem Inst, Pacific NW Labs, Environm & Hlth Sci Div, Richland, WA 99352 USA Battelle Mem Inst Richland WA USA 99352 h Sci Div, Richland, WA 99352 USA
Titolo Testata:
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS
fascicolo: 4, volume: 18, anno: 2000,
parte:, 2
pagine: 1893 - 1899
SICI:
0734-2101(200007/08)18:4<1893:IOHWSA>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
FORMIC-ACID DECOMPOSITION; CATALYTIC DECOMPOSITION; TIO2(110) SURFACE; REACTION PATHS; TIO2; FORMALDEHYDE; SRTIO3(001); ADSORPTION; SWITCHOVER; OXIDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, LQ Battelle Mem Inst, Pacific NW Labs, Environm & Hlth Sci Div, POB 999, Richland, WA 99352 USA Battelle Mem Inst POB 999 Richland WA USA 99352and, WA 99352 USA
Citazione:
L.Q. Wang et al., "Interaction of HCOOH with stoichiometric and reduced SrTiO3(100) surfaces", J VAC SCI A, 18(4), 2000, pp. 1893-1899

Abstract

interaction of formic acid with stoichiometric (TiO2-terminated) and reduced SrTiO3(100) surfaces has been investigated using temperature programmed desorption (TPD), and x-ray photoelectron spectroscopy (XPS). Formic acid was dissociated to form formate and a surface proton below 250 K on both stoichiometric and reduced SrTiO3(100) surfaces. Formate was decomposed primarily through dehydration to produce CO and H2O, instead of through dehydrogenation to produce CO2 and H-2, on both surfaces. Formaldehyde produced fromdecomposition of formate was also observed on both surfaces. On stoichiometric surfaces, formaldehyde was produced through bimolecular coupling of two formates on low-coordination Ti cation sites: However, on the reduced surface, formaldehyde formation involves the reduction of surface formates through the oxidation of reduced Ti cations. XPS results show that surface defects on reduced SrTiO3(100) surfaces were reoxidized significantly upon exposure to 30 L HCOOH at 300 K, in contrast to defects on reduced TiO2(110) surfaces where no reduction in defect intensity was observed under identicalconditions. The TPD peak of formaldehyde on a reduced SrTiO3(100) surface is shifted to lower temperature and is significantly broader (down to below300 K) compared to on the stoichiometric surface. The adsorption and decomposition of HCOOH on SrTiO3(100) surfaces are compared with those on TiO2 sur faces. (C) 2000 American Vacuum Society. [S0734-2101(00)10204-0].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 22:03:43