Catalytic oxidation-extractive desulfurization for model oil using inorganic oxysalts as oxidant and Lewis acid-organic acid mixture as catalyst and extractant

Authors:   Hongyan Song, Jiajun Gao, Xingyu Chen, Jing He, Chunxi Li

Abstract:
The catalytic oxidation-extractive desulfurization (COEDS) performance for benzothiophene (BT-) and dibenzothiophene (DBT-) containing oils is studied at room temperature with respect to three inorganic oxysalt oxidants (KMnO₄, K₂Cr₂O₇, and NaClO₄) under the catalysis of an acid mixture being composed of different kinds and amounts of Lewis acid (FeCl₃, ZnCl₂ or CuCl₂) and organic acid (formic, acetic or propionic acid). The results show that both KMnO₄ and K₂Cr₂O₇ are efficient oxidants, and their oxidizability can be adjusted effectively by the types and tuned slightly by the amounts of the Lewis acid used, and acetic acid is an appropriate organic acid. DBT is oxidized only to DBTO₂, while BT is converted to two to over six oxidized S-species depending on the Lewis acid used. 1-hexene presented in oil can slightly lower the S-conversion, but a promising desulfurization rate of over 92% for both BT and DBT can be also achieved under appropriate conditions.

Keywords:
Catalytic oxidation extractive desulfurization
Benzothiophene
Dibenzothiophene
Model oil
Lewis acid

Published in: Applied catalysis A: General  (Volume 456, Pages 1-248, 10 April 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Catalytic oxidation-extractive desulfurization for model oil using inorganic oxysalts as oxidant and Lewis acid-organic acid mixture as catalyst and extractant

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