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Oxidative Desulfurization of Diesel Oil Using Mesoporous Phosphotungstic Acid/SiO 2 as Catalyst
Author(s) -
Yan XueMin,
Lei JiaHeng,
Liu Dan,
Wu YangChun,
Guo LiPing
Publication year - 2007
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200700131
Subject(s) - phosphotungstic acid , chemistry , benzothiophene , dibenzothiophene , flue gas desulfurization , catalysis , sulfur , diesel fuel , mesoporous material , inorganic chemistry , organic chemistry , thiophene
Ordered mesoporous phosphotungstic acid/SiO 2 (HPW/SiO 2 ) with Keggin‐type heteropolyacids (HPAs) encapsulated into a SiO 2 framework has been synthesized and used as the catalyst for oxidative desulfurization of diesel fuel. The sulfur compounds in diesel were oxidized and removed at a temperature range of 50–80 °C with H 2 O 2 as the oxidant and acetonitrile as the extraction agent. The sulfur content in diesel was reduced to as low as 48–86 μg/g from the initial level of 438 μg/g. The loss in catalytic activity was negligible even after five cycles of use, and the reduction of the sulfur content was enhanced with increasing the immobilized phosphotungstic acid (HPW) concentration. Oxidation of model compounds showed that in the heterogeneous system both the electron density and the steric hindrance affected the reactivity of these sulfur compounds. The reactivities of these sulfur compounds studied in this work followed the order of dibenzothiophene > 4,6‐dimethydibenzothiophene > benzothiophene.