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Removal of Thiophenic Sulfurs Using an Extractive Oxidative Desulfurization Process with Three New Phosphotungstate Catalysts

By Hongxing Zhang (209372), Jiajun Gao (2083183), Hong Meng (82691) and Chun-Xi Li (2025484)

Abstract

Three Keggin-type phosphotungstates, i.e. [C<sub>5</sub>H<sub>5</sub>NH]<sub>3</sub>PW<sub>12</sub>O<sub>40</sub>, [C<sub>4</sub>H<sub>6</sub>N<sub>2</sub>H]<sub>3</sub>PW<sub>12</sub>O<sub>40</sub>·3C<sub>4</sub>H<sub>6</sub>N<sub>2</sub> and [(C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>N]<sub>3</sub>PW<sub>12</sub>O<sub>40</sub>, were synthesized and characterized by elemental analysis, X-ray diffraction, and infrared spectra, meanwhile their catalysis in an extractive catalytic oxidative desulfurization process was studied with ionic liquid (IL) as extractant and H<sub>2</sub>O<sub>2</sub> as oxidant. The main factors affecting the desulfurization process were investigated, including temperature, hydrophobicity of IL, and variety of S-compounds, as well as the amount of catalyst, IL, and H<sub>2</sub>O<sub>2</sub>. Under the optimal conditions, the S-content of DBT oil can be decreased from 1000 to 2 ppm. A new interpretation is proposed for the current process, in which IL is assumed as a reaction phase, and the amount of the extracted S-compound and the peroxidized catalyst wherein greatly affect the desulfurization rate. Besides, the IL with the dissolved catalyst can be reused many times and regenerated easily

Topics: Biochemistry, Science Policy, Virology, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, oxidative desulfurization process, catalyst, Extractive Oxidative Desulfurization Process, H 2O, 4H, IL, DBT, 5H
Year: 2012
DOI identifier: 10.1021/ie3004545.s001
OAI identifier: oai:figshare.com:article/2522197
Provided by: FigShare
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