Catalytic behaviors of combined oxides derived from Mg/AlxFe1−x-Cl layered double hydroxides for H2S selective oxidationElectronic supplementary information (ESI) available. See DOI: 10.1039/c5cy00689a
A series of Mg 2 Al x Fe 1− x LDH compounds was synthesized by a one-step method. The structural and chemical properties were studied by various methods and the derived oxides were tested for H 2 S selective oxidation. It was observed that the iron species existed mainly in the form of isolated Fe 3...
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Main Authors | , , , , , , |
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Format | Journal Article |
Language | English |
Published |
19.10.2015
|
Online Access | Get full text |
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Summary: | A series of Mg
2
Al
x
Fe
1−
x
LDH compounds was synthesized by a one-step method. The structural and chemical properties were studied by various methods and the derived oxides were tested for H
2
S selective oxidation. It was observed that the iron species existed mainly in the form of isolated Fe
3+
species, α-Fe
2
O
3
, γ-Fe
2
O
3
and Fe
3
O
4
. Moreover, the nature of the iron oxides was varied with the rise in the iron content. Significantly, the catalysts exhibited high catalytic activity and reasonable durability at a relatively lower temperature and higher GHSV. The catalysts obeyed the step-wise mechanism for H
2
S selective catalytic oxidation. And the chemically adsorbed oxygen on the oxygen vacancies participated in the H
2
S selective oxidation reaction and played a key role in the H
2
S selective oxidation into elemental sulfur. The catalyst deactivation was due mainly to the deposit of elemental sulfur. Additionally, the small amount of the formed less active Fe
2
(SO
4
)
3
species also led to catalyst deactivation.
H
2
S was firstly adsorbed on the moderated basic site and then oxidized into elemental sulfur by Fe
3+
. |
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Bibliography: | 10.1039/c5cy00689a Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2044-4753 2044-4761 |
DOI: | 10.1039/c5cy00689a |