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Construction of Amphiphiic/Poyoxometalate Supermolecuar and Its Application in Redox System

Author: JinBeiBei
Tutor: XiaWuJiong
School: Harbin Institute of Technology
Course: Physical and chemical
Keywords: Oxidative desulfurization Gemini Polyoxometalate Dipenylalanine
CLC: TE624.5
Type: Master's thesis
Year: 2012
Downloads: 19
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Abstract


New requirements for very low sulfur content （10ppm） in liquid motor fuelsdemand novel approaches for ultra-deep desulfurization. For production ofnear-zero-sulfur diesel and low-sulfur fuel oil, removal of refractory sulfurcompounds, like4,6-dimethyldibenzothiophene and other alkyl-substitutedthiophene derivatives, is necessary. Elimination of these compounds byhydrodesulfurization （HDS） requires high hydrogen consumption, high pressureequipment, and new catalysts. During all the alternative desulfurization methods, theoxidative desulfurization is considered to be one of the most promising ultra-deepdesulfurization methods.Fhe comments of ultra-deep desulfurization, conventional hydrodesulfurization,oxidation/extraction desulfurization were all reviewed in this paper. In recentresearches, polyoxometalates and the conventional surfactants were mainly used asthe catalysts of oxidative desulfurization, however the Gemini surfactants have notbeen reported to apply in the ultra-deep desulfurization.Five Gemini surfactants were synthesized, whose spacer length were diverse.Then, polyoxometalate(H3AsMo12O40) was compounded with Gemini surfactant byelectrostatic interaction. In this method, we developed the organic-inorganiccomplex （Gn/POM） with mesoporous phase, which could be used as catalysts in theoxidative desulfurization. The Gn/POM owned higher catalytic activity than theconventional surfactant encapsulated polyoxometalate in the desulfurization ofmodel fuel which is composed of the BT, DBT and4,6-DMDBT. The G2/POMpossessed the highest Kapp and TOP, can eliminate99%of sulfur compound of themodel fuel （DBT,1000ppm） in the mild condition （60℃,1atm.） during35min.However the conventional surfactant encapsulated polyoxometalate （STAB/POM）needed75min in the same condition.We synthesized and modified the diphenylalanine, compounded thesemolecular with polyoxometalate （H3PW12O40） by electrostatic interaction, exploredthe self-assembly of both the modified peptides and complex in diverse solutions.Modified peptides showed nanofiber and nanotube, while the hybrid complexespresented nanosphere. Owning to the redox ability of H3PW12O40, we developed theexperiment of in situ reduction and load of the nobal metal （Au）. In the co-efforts ofpolyoxometalate and UV, the Au （Ⅲ） was converted to Au （0） and well distributedon the surface of the nanosphere, characterized by SEM, TEM, Ultra-Violetanalysis.

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Petroleum refining > The refining process > Refined treatment
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