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MoO_3/SiO_2 modified its oxidative desulfurization activity

Author: LiuLuDa
Tutor: WangAnJie
School: Dalian University of Technology
Course: Industrial Catalysis
Keywords: Dibenzo thiophene bite Oxidative desulfurization Cumene peroxide, hydroxyl Citric acid Oxalic acid CeO2
CLC: TE624.55
Type: Master's thesis
Year: 2011
Downloads: 85
Quote: 0
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Abstract


With the SOx sulfur oil combustion caused increasingly serious environmental pollution, the world strictly limit the sulfur content in diesel fuel. As the steric hindrance of diesel dibenzo thiophene sulfur compounds in the conventional hydrodesulfurization process of low activity, difficult to remove. If the hydrodesulfurization method of removal of these sulfur compounds require harsh reaction conditions, thereby increasing the cost of production. As a novel oxidative desulfurization desulfurization technology, with mild reaction conditions, high desulfurization efficiency, low operating cost, simple process and become a research hotspot. This paper uses an equal volume impregnation MoO3/SiO2 supported catalyst, and were introduced citric acid (Citric acid, CA), oxalic acid (Oxalic acid, OA) and CeO2 catalyst for MoO3/SiO2 modified. By UV - visible diffuse reflectance spectroscopy (Ultraviolet-visible diffuse reflection spectrum, UV-vis), X-ray photoelectron spectroscopy (X-ray photoelectron spectroscopy, XPS), TEM (Transmission electron microscope, TEM) and low-temperature nitrogen adsorption method. MoO3/SiO2 and citric acid modified catalysts were characterized by analysis. And inductively coupled plasma atomic emission spectrometry (Inductively coupled plasma, ICP) analysis of the reaction after Mo03 load. In dibenzothiophene (Dibenzothiphene, DBT) in toluene as a model oil (sulfur content of 2000ppm), cumene peroxide, hydroxyl (Cumene hydroperoxide, CHP) as oxidant (O / S = 4, the molar ratio), the 50 ℃ under a fixed-bed flow reactor for catalytic oxidation catalyst removal of DBT research. The results showed that, 20% MoO3/SiO2 oxidation of low catalytic activity DBT, DBT the maximum conversion rate of about 65%. Using citric acid or oxalic acid catalysts prepared by impregnation of higher activity, DBT maximum conversion rate of 80%. Characterization of the catalyst by analysis, that the introduction of citric acid or oxalic acid can promote the dispersion of M003 and thus improve the catalytic activity. Citric acid or oxalic acid treatment using the modified activity of the catalyst is improved, also the highest removal rate of DBT can reach 80%. By characterization analysis, that the introduction of citric acid or oxalic acid not only affect the interaction between the active species and the carrier, during the heat treatment may also play a reducing agent, to promote the small Mo5 species generated, thus affecting the activity of the catalyst reaction. However, Mo5 CHP in the reaction will be oxidized to reduced activity. Prepared by co-impregnation can make 20% M003-CeO2/SiO2 DBT conversion rate of 90%. Analysis of CeO2 on MoO3 has dispersion, and the surface defects sites to promote the generation of reactive oxygen species. The introduction of the citric acid or oxalic acid for its modification, the catalyst activity and improved. Through characterization analysis, citric acid or oxalic acid is also formed on the surface of the catalyst Mo5, and CeO2 able to Mo5 catalytic activity play a catalytic role.

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