The state of iron in the Fe-ZSM-5-N2O system for selective oxidation of methane to methanol from data of Mossbauer spectroscopy

Authors
Ovanesyan, NS Shteinman, AA Dubkov, KA Sobolev, VI Panov, GI
Citation
Ns. Ovanesyan et al., The state of iron in the Fe-ZSM-5-N2O system for selective oxidation of methane to methanol from data of Mossbauer spectroscopy, KINET CATAL, 39(6), 1998, pp. 792-797
Citations number
6
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
KINETICS AND CATALYSIS
ISSN journal
00231584 → ACNP
Volume
39
Issue
6
Year of publication
1998
Pages
792 - 797
Database
ISI
SICI code
0023-1584(199811/12)39:6<792:TSOIIT>2.0.ZU;2-G
Abstract
Mossbauer spectra of Fe-ZSM-5 zeolite treated successively with N2O to obta in active alpha-oxygen and then with CH4 were recorded. In air, the paramet ers of spectra significantly changed because Fe2+ changed its coordination from tetrahedral to octahedral. It was found that, when alpha-oxygen reacte d with CH4 in the absence of air, Fe3+ previously formed by the reaction th at yields alpha-oxygen from N2O is partially reduced to Fe2+. The nature of active states of iron and the mechanism of methane oxidation are discussed .