溶胶-凝胶法制备MoP/SiO_2催化剂及其加氢脱硫催化活性的研究

Preparation of MoP/SiO_2 catalyst by sol-gel method and its performance in hydrodesulfurization

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、焙烧处理后,程序升温还原制备得到二氧化硅负载磷化钼(MoP)催化剂,并以二苯并噻吩为模型化合物,对催化剂的加氢脱硫活性进行初步评价,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。结果表明,溶胶-凝胶法制备负载催化剂最佳磷化钼负载量为20%(质量分数);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。

A series of silica-supported molybdenum phosphide(MoP) catalysts with different loading are synthesized via temperature programmed reaction of oxidic precursors,which are preapred by sol-gel method.The performance of these synthesized catalyst in hydrodesulfurization (HDS) is evaluated with dibenzothiophene as model compounds in autoclave with 300℃ and 7 MPa as topic reaction temperature and pressure,respectively.These results indicate that some factors,including total loading,reaction pressure and temperature have great influence on the HDS performance of these MoP/SiO2 catalysts.And there is an optimal total loading of 20% (mass fraction) for supported catalysts.The increase of reaction pressure and temperature both favor to HDS of dibenzothiophene,but the content of biphenyl in products is decreasing with the increasing of reaction pressure or temperature.