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Titolo:
SiO2-supported vanadium magnesium mixed oxides as selective catalysts for the oxydehydrogenation of short chain alkanes
Autore:
Solsona, B; Dejoz, A; Vazquez, MI; Marquez, F; Nieto, JML;
Indirizzi:
UPV, CSIC, Inst Tecnol Quim, Valencia 46022, Spain UPV Valencia Spain 46022 , CSIC, Inst Tecnol Quim, Valencia 46022, Spain Univ Valencia, Dept Ingn Quim, E-46100 Burjassot, Spain Univ Valencia Burjassot Spain E-46100 ngn Quim, E-46100 Burjassot, Spain
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1-2, volume: 208, anno: 2001,
pagine: 99 - 110
SICI:
0926-860X(20010214)208:1-2<99:SVMMOA>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
MG-O CATALYSTS; OXIDATIVE DEHYDROGENATION; N-BUTANE; PROPANE; ETHYLBENZENE; SYSTEM;
Keywords:
oxidative dehydrogenation of propane and butane; selective oxidation of propylene; Magnesium vanadates; SiO2-supported vanadium magnesium mixed oxides; acrolein;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Nieto, JML UPV, CSIC, Inst Tecnol Quim, Avda los Naranjos S-N, Valencia 46022, Spain UPV Avda los Naranjos S-N Valencia Spain 46022 ia 46022, Spain
Citazione:
B. Solsona et al., "SiO2-supported vanadium magnesium mixed oxides as selective catalysts for the oxydehydrogenation of short chain alkanes", APP CATAL A, 208(1-2), 2001, pp. 99-110

Abstract

Unsupported and SiO2-supported VMgO mixed oxides catalysts have been prepared. characterized and tested in the oxidation of propane, n-butane and propylene. Mg-vanadates are observed by XRD, IR and Raman spectroscopy in bothpure and supported VMgO catalysts, although the effective Mg/V ratio, in the VMgO phases formed, depends on the silica content. Since SiO2 reacts partially with MgO during the calcination step. forming Mg2SiO4, the effectiveMg/V ratio depends on the silica content. In this sense, pyro-Mg2V2O7 is mainly formed on supported catalysts with Mg/V atomic ratios lower than 4, while ortho-Mg3V2O8 is observed on supported catalysts with Mg/V atomic ratios higher than 4. For this reason, it can be concluded that the Mg/V atomicratio of crystalline VMgO phases observed on supported catalysts is lower than those observed on unsupported ones. The catalytic tests for the oxidation of propane and n-butane indicate that the catalytic behavior of supported catalysts depends on both the SiO2 content and the Mg/V atomic ratio, although a different behavior during the oxidation of n-butane or propane is observed: the most selective catalysts for the oxydehydrogenation (OXDH) ofpropane were those with ortho-Mg3V2O7/MgO or ortho-Mg3V2O8/MgO mixed phases while the most selective catalysts for the OXDH of n-butane are formed byortho-Mg3V2O8/MgO mixed phases. On the other hand, V-containing compounds with V=O double bonds are required in order to obtain selective catalysts for the oxidation of propylene to acrolein. In the selective oxidation of propylene, acrolein is not formed on catalysts in which ortho-Mg3V2O8/MgO mixed phases are mainly detected. However, acrolein was obtained on catalysts in which V=O double bonds are present. (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 07/07/20 alle ore 11:40:23