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Titolo:
Partial oxidation of methane on potassium-promoted WO3/SiO2 and on K2WO4/SiO2 catalysts
Autore:
Erdohelyi, A; Nemeth, R; Hancz, A; Oszko, A;
Indirizzi:
Univ Szeged, Inst Solid State & Radiochem, H-701 Szeged, Hungary Univ Szeged Szeged Hungary H-701 tate & Radiochem, H-701 Szeged, Hungary Hungarian Acad Sci, React Kinet Res Grp, H-701 Szeged, Hungary Hungarian Acad Sci Szeged Hungary H-701 t Res Grp, H-701 Szeged, Hungary
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1, volume: 211, anno: 2001,
pagine: 109 - 121
SICI:
0926-860X(20010316)211:1<109:POOMOP>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELECTIVE PARTIAL OXIDATION; MOLYBDENUM OXIDE CATALYSTS; SILICA-SUPPORTED MOO3; MOLYBDATE CATALYSTS; MOO3/SIO2 CATALYST; RAMAN-SPECTROSCOPY; TUNGSTEN-OXIDE; V2O5 CATALYSTS; NITROUS-OXIDE; FORMALDEHYDE;
Keywords:
partial oxidation; WO3/SiO2; K2WO4/SiO2; methane oxidation; Raman spectra of K2WO4; XP spectra of K2WO4;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Erdohelyi, A Univ Szeged, Inst Solid State & Radiochem, POB 168, H-701 Szeged, Hungary Univ Szeged POB 168 Szeged Hungary H-701 701 Szeged, Hungary
Citazione:
A. Erdohelyi et al., "Partial oxidation of methane on potassium-promoted WO3/SiO2 and on K2WO4/SiO2 catalysts", APP CATAL A, 211(1), 2001, pp. 109-121

Abstract

The partial oxidation of methane to formaldehyde or ethane and ethylene was studied on K2WO4 deposited on various supports, on potassium-promoted WO3/SiO2 and for comparison on WO3/SiO2 in a fixed-bed continuous-flow reactorat 860-923 K using O-2 as oxidant. The catalysts were characterised by Raman, XP spectroscopy and TPR method. It was found that the original structure of potassium tungstate remained on K2WO4/SiO2, whereas K2W2O7 was very likely formed on K + WO3/SiO2. The main products of the reaction besides the carbon oxides were HCHO on WO3/SiO2 while on K-containing samples mainly the C-2 hydrocarbons were formed. The product distribution of the oxidation reaction was markedly influenced by the nature of the support. The highest activity was measured for alumina-supported catalyst. In this case, however,only traces of partially oxidised products were formed. Formaldehyde, in alarger quantity, was produced on WO3/SiO2 but C-2 in higher selectivity onK2WO4/SiO2 was formed. A possible mechanism for the oxidative conversion of methane is also discussed. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 03/07/20 alle ore 00:41:14