期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 121, 期 43, 页码 23988-23999出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b06373
关键词
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资金
- Consejo Nacional de Ciencia y Technologia de Mexico (CONACyT-Mexico)
- Mexican Petroleum Institute
- [SIP-20161182]
- [SIP-20161343]
- [SIP-20171266]
- [SIP-20170628]
For the first time, creation of oxygen defects in the crystalline structure of WO3/SBA-15 catalysts and its correlation with Lewis acidity and catalytic activity in the oxidation of 4,6-dimethyldibenzothiophene (4,6-DMDBT) in a model diesel were reported. All the WO3/SBA-15 catalysts predominantly contained Lewis acid sites and some oxygen defects in the crystalline structure of WO3. The oxygen defect concentration increased from 1.67% to 16.66% per lattice cell unit, and the number of Lewis acid sites varied from 92 to 458 mu tmol/g as the WO3 content increased from 5 to 25 wt %. The 4,6-DMDBT conversion was almost proportional to both the number of Lewis acid sites and oxygen defects. Formic acid addition led to formation of peroxyformic acid which coordinated with surface W6+ to generate reactive oxygen species like peroxometallic complex, improving oxidant stability and 4,6-DMDBT oxidation efficiency. More than 99% of 4,6-DMDBT was removed with the best 25 wt % WO3/SBA-15 catalyst within 15 min of reaction under the optimal condition. A reaction mechanism involving peroxometallic complexes formation, 4,6-DMDBT molecules adsorption, and surface oxidation reaction on structural defects and vanadia nanoparticles was proposed. This biphasic reaction system consisting of a catalyst bearing Lewis acid site, a green oxidant, an oxidant promoter, and a polar solvent would simultaneously perform the oxidation and separation of polyaromatic sulfur compounds in one operation which was very practical for ultralow sulfur diesel production.
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