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Titolo:
TPD STUDY OF LABILE OXYGEN ON A (VO)(2)P2O7 CATALYST ACTIVE IN N-BUTANE PARTIAL OXIDATION
Autore:
JOLY JP; MEHIER C; BERE KE; ABON M;
Indirizzi:
UNIV LYON 1,UM 5634 CNRS,LAB APPLICAT CHIM ENVIRONM F-69622 VILLEURBANNE FRANCE INST RECH CATALYSE,CNRS F-69626 VILLEURBANNE FRANCE
Titolo Testata:
Applied catalysis. A, General
fascicolo: 1, volume: 169, anno: 1998,
pagine: 55 - 63
SICI:
0926-860X(1998)169:1<55:TSOLOO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-OXIDE CATALYSTS; VANADYL PYROPHOSPHATE; MALEIC-ANHYDRIDE; PROGRAMMED DESORPTION; ADSORPTION; ACIDITY;
Keywords:
OXYGEN TPD; N-BUTANE OXIDATION; VANADYL PYROPHOSPHATE CATALYST; LABILE OXYGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
J.P. Joly et al., "TPD STUDY OF LABILE OXYGEN ON A (VO)(2)P2O7 CATALYST ACTIVE IN N-BUTANE PARTIAL OXIDATION", Applied catalysis. A, General, 169(1), 1998, pp. 55-63

Abstract

The interaction of oxygen with the surface of vanadyl pyrophosphate has been studied by Temperature-Programmed Desorption (TPD) under vacuum between 300 and 1000 K. It is shown that the adsorption of oxygen onto the catalyst does not occur at temperatures in the range 300-570 K and that it is activated. The behaviour of the main TPD peak around 850 K agrees with second order desorption kinetics showing that adsorption is dissociative. The use of Intermittent TPD (ITPD), which is a particular threshold method, shows that the labile superficial oxygen desorbing up to 900 K is virtually homogeneous with an activation energy of desorption of 327 KJ/mol O-2. Adsorption sites are tentatively assigned to cus V4+, acting as Lewis acid centers, located in the (100) plane of the (VO)(2)P2O7 structure, in the prolongation of the vanadyl columns. The role of labile oxygen in the catalytic oxidation of butaneinto maleic anhydride is discussed. (C) 1998 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 17:49:12