Hydrodesulfurization activity of MoP/SiO2 catalyst prepared by sol-gel method
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摘要: 以正硅酸乙酯为硅源，以钼酸铵和磷酸二氢铵为钼源和磷源，采用溶胶-凝胶法，经干燥、焙烧，程序升温还原制备得到二氧化硅负载磷化钼(MoP)催化剂。以噻吩、二苯并噻吩为模型化合物，对负载催化剂的加氢脱硫活性进行评价，考察了负载量、反应压力、反应温度等因素对催化活性的影响。实验结果表明，MoP/SiO2催化剂Mo的最佳负载量为20%，升高反应压力和温度均有利于提高二苯并噻吩的转化率，但降低了产物中联苯的含量。Abstract: A series of silica supported MoP (MoP/SiO2) catalysts with different Mo loadings were prepared by sol-gel method, followed by temperature programmed reduction treatment. The hydrodesulfurization (HDS) activity of the MoP/SiO2 catalysts was evaluated with thiophene and dibenzothiophene as model compounds. The influences of Mo loading, reaction pressure and temperature on the HDS activity were investigated. The catalysts MoP/SiO2 exhibit high activity for the HDS of thiophene and dibenzothiophene; the highest activity is observed over MoP/SiO2 with a Mo loading of 20%. An elevation of the reaction pressure or temperature can enhance the HDS of dibenzothiophene; however, it may also decrease the content of biphenyl in the products.
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Key words:
- molybdenum phosphide /
- silica /
- hydrodesulfurization (HDS) /
- sol-gel method
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