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Titolo:
Deactivation kinetics of V/Ti-oxide in toluene partial oxidation
Autore:
Bulushev, DA; Reshetnikov, SI; Kiwi-Minsker, L; Renken, A;
Indirizzi:
EPFL, LGRC, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland EPFL Lausanne Switzerland CH-1015 Technol, CH-1015 Lausanne, Switzerland Boreskov Inst Catalysis, Novosibirsk 630090, Russia Boreskov Inst Catalysis Novosibirsk Russia 630090 sibirsk 630090, Russia
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1-2, volume: 220, anno: 2001,
pagine: 31 - 39
SICI:
0926-860X(20011025)220:1-2<31:DKOVIT>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
VANADIA-TITANIA CATALYSTS; V2O5/TIO2 CATALYSTS; O-XYLENE; SELECTIVE OXIDATION; TRANSIENT KINETICS; SURFACE; TIO2; AMMOXIDATION; HYDROCARBONS; POTASSIUM;
Keywords:
V/Ti-oxide catalysts; toluene partial oxidation; DRIFTS in situ; kinetic modelling; deactivation; vanadia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Renken, A EPFL, LGRC, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland EPFL Lausanne Switzerland CH-1015 H-1015 Lausanne, Switzerland
Citazione:
D.A. Bulushev et al., "Deactivation kinetics of V/Ti-oxide in toluene partial oxidation", APP CATAL A, 220(1-2), 2001, pp. 31-39

Abstract

Deactivation kinetics of a V/Ti-oxide catalyst was studied in partial oxidation of toluene to benzaldehyde (BA) and benzoic acid (BAc) at 523-573 K. The catalyst consisted of 0.37 monolayer of VOx species and after oxidativepre-treatment contained isolated monomeric and polymeric metavanadate-likevanadia species under dehydrated conditions as was shown by FT Raman spectroscopy. Under the reaction conditions via in situ DRIFTS fast formation ofadsorbed carboxylate and benzoate species was observed accompanied by disappearance of the band of the monomeric species (2038 cm(-1)) (polymeric species were not controlled). Slow accumulation of maleic anhydride, coupling products and/or BAc on the surface caused deactivation of the catalyst during the reaction. Temperature-programmed oxidation (TPO) after the reaction showed formation of high amounts of CO, CO2 and water. Rate constants for the steps of the toluene oxidation were derived via mathematical modelling of reaction kinetics at low conversion and constant oxygen/toluene ratio of 20:1. The model allows predicting deactivation dynamics, steady-state ratesand selectivity. The highest rate constant was found for the transformation of BA into BAc explaining a low BA yield in the reaction. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 07:32:27