Premium
Mössbauer study of carbon‐supported spinel clusters catalysing oxidative decomposition of hydrogen sulphide: role of the labile surface oxygen
Author(s) -
Maksimov Yu. V.,
Tsodikov M. V.,
Perederii M. A.,
Bukchtenko O. V.,
Suzdalev I. P.,
Navio J. A.
Publication year - 2000
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/1096-9918(200008)30:1<74::aid-sia748>3.0.co;2-f
Subject(s) - magnetite , nanoclusters , stoichiometry , decomposition , chemistry , spinel , oxygen , carbon fibers , hydrogen , inorganic chemistry , mössbauer spectroscopy , sulfur , catalysis , crystallography , materials science , metallurgy , organic chemistry , composite number , composite material
Activity–structure relationships have been studied in the oxidative decomposition of hydrosulphur. Structure‐organized magnetic nanoclusters of non‐stoichiometric magnetite Fe 3 O 4+δ with mean sizes 〈 d 〉 ∼ 10–15 nm and non‐stoichiometry parameters δ ∼ 0.12–0.13 were shown to be active compositions of carbon‐supported catalysts. For the gas flow of air (1.5 vol.%), CH 4 (98.0 vol.%) and H 2 S (0.5 vol.%) the coal‐supported magnetite nanoclusters were found to convert 100% H 2 S into elemental sulphur at 150 °C and atmospheric pressure. A model of the surface‐active centres is discussed in terms of the anion vacancy and surface labile oxygen formation. Copyright © 2000 John Wiley & Sons, Ltd.