Preparation of MoO3-x/SiO2 catalysts and application in oxidative desulfurization
LIU Hong-li1, SHAN Yuan-yuan2, DU Zhen-yi1
1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China; 2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Abstract: A series of supported MoO3-x/SiO2 catalysts are prepared via equal volume immersion method by using hydrophilic SiO2 as supporter and ammonium molybdate as precursor.The prepared catalysts are characterized by mean of N2 adsorption-desorption,X-ray diffraction,Raman spectroscopy,UV-Vis spectroscopy,X-ray photoelectron spectroscopy and hydrogen temperature-programmed reduction.In an oxidative desulfurization process using acetonitrile as extractant and H2O2 as oxidant,the intrinsic rule relationship between the catalytic activity and the surface properties of the catalyst is studied.Study results indicate that the agglomeration of MoO3-x active is the main reason to inhibit the oxidative desulfurization activity.A suitable calcination temperature is important to obtain the catalysts with desired active sites,high dispersion for the rapid activation of H2O2 and an improved desulfurization rate.The removal rates of benzothiophene,dibenzothiophene and 4,6-dimethyldibenzothiophene are 77.2%,99.3% and 96.4%,respectively under the conditions that the calcination temperature is 350oC,the optimal O/S ratio is 3 and the optimal reaction temperature is 60℃.Advantageously,the present catalytic system can achieve China's national desulfurization standard (<10 ppm) with respect to benzothiophene.
刘红利, 单媛媛, 杜朕屹. MoO3-x/SiO2催化剂的制备及其在氧化脱硫中的应用[J]. 现代化工, 2023, 43(2): 173-179.
LIU Hong-li, SHAN Yuan-yuan, DU Zhen-yi. Preparation of MoO3-x/SiO2 catalysts and application in oxidative desulfurization. Modern Chemical Industry, 2023, 43(2): 173-179.
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