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Titolo:
Photoactivation of CO in Ti silicalite molecular sieve
Autore:
Yeom, YH; Frei, H;
Indirizzi:
Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Mailstop Calvin Lab, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 vin Lab, Berkeley, CA 94720 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 22, volume: 105, anno: 2001,
pagine: 5334 - 5339
SICI:
1089-5639(20010607)105:22<5334:POCITS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
FT-IR SPECTROSCOPY; PHOTOCATALYTIC REDUCTION; TITANIUM SILICALITE; FRAMEWORK TI(IV); ZEOLITE; LIGHT; H2O; MECHANISMS; TI-MCM-41; ALKOXIDES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Frei, H Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Mailstop Calvin Lab, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA94720 Berkeley, CA 94720 USA
Citazione:
Y.H. Yeom e H. Frei, "Photoactivation of CO in Ti silicalite molecular sieve", J PHYS CH A, 105(22), 2001, pp. 5334-5339

Abstract

Irradiation at 266 nm of Ti silicalite (TS-1) molecular sieve loaded with CO and CH3OH gas at 173 K gave methyl formate as the main product. The photoreaction was monitored in situ by FT-IR spectroscopy and was attributed toreduction of CO at LMCT-excited framework Ti centers under concurrent oxidation of methanol. Infrared product analysis based on experiments with (CO)-O-18, (CO)-C-13, and (CH3OH)-C-13 revealed that carbon monoxide is incorporated into the eater as a carbonyl moiety. It is proposed that CO is photoreduced by transient Ti3+ to HCO radical in the primary redox step. This finding opens up the possibility for synthetic chemistry of carbon monoxide intransition metal materials by photoactivation of framework metal centers.

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Documento generato il 30/09/20 alle ore 07:11:17