New Catalysts Active for the Mild Oxidation of Hydrogen Sulfide to Sulfur

Nickel iron phosphates were studied for the selective oxidation of hydrogen sulfide to sulfur. Nickel iron phosphate and Fe/Cr samples were more active than simple iron, chromium, and mixed iron–chromium oxides, which had been previously studied. Nickel iron phosphate catalyst prepared by solid–soli...

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Bibliographic Details
Published in:Journal of catalysis 1999-10, Vol.187 (2), p.385-391
Main Authors: Laperdrix, E., Costentin, G., Guyen, N.N, Saur, O., Lavalley, J.C.
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
03 NATURAL GAS
Catalysis
CATALYSTS
Catalysts: preparations and properties
CATALYTIC EFFECTS
Chemistry
CHROMIUM
CLAUS PROCESS
CRYSTAL STRUCTURE
ENVIRONMENTAL SCIENCES
Exact sciences and technology
General and physical chemistry
HYDROGEN SULFIDES
IRON
IRON PHOSPHATES
NICKEL PHOSPHATES
OXIDATION
SULFUR
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Nickel iron phosphates were studied for the selective oxidation of hydrogen sulfide to sulfur. Nickel iron phosphate and Fe/Cr samples were more active than simple iron, chromium, and mixed iron–chromium oxides, which had been previously studied. Nickel iron phosphate catalyst prepared by solid–solid method with, consequently, a very low specific surface area was intrinsically active and selective to sulfur (conversion 17%, Sn selectivity 97%); no rapid deactivation was observed. Even though higher specific surface area samples, prepared according to a solution method at various calcination temperatures, showed better performance (conversion 76%, Sn selectivity >90%), the specific activity depended on the crystallinity of the samples. The reaction is apparently structure sensitive. The structure of the catalytic material must facilitate electronic exchange, evidenced by Mössbauer Characterization. The establishment of the mixed valency Fe2+/Fe3+ under catalytic feed was shown to be an essential factor in this reaction.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1999.2607