H2S/H2硫化温度对MoP/SiO2催化剂硫醚化性能的影响

以负载磷酸钼为前驱体，采用程序升温还原法制备了MoP/SiO₂催化剂，以体积分数3%H₂S/H₂对其进行了硫化处理，利用XRD、CO化学吸附、NH₃-TPD、HRTEM-EDX、ICP-AES以及XPS等手段对催化剂进行了表征，研究了硫化温度对MoP/SiO₂催化剂结构和异戊二烯与正丁硫醇硫醚化性能的影响。结果表明，即使在400℃硫化处理也未改变MoP/SiO₂催化剂中MoP体相结构；随着硫化温度提高，催化剂表面酸量增加、金属位数量减少，降低了催化剂C-S键氢解及异戊二烯深度加氢活性，但同时也提高了催化剂烯烃聚合活性。经120℃硫化处理的MoP/SiO₂兼具较佳硫醚化及异戊二烯选择加氢性能。

Effect of H2S/H2 sulfuration temperature on performance of MoP/SiO2 catalyst for thioetherification

The MoP/SiO₂ catalyst was prepared from the supported Mo phosphate by the H₂-TPR method and treated with 3%H₂S/H₂ at different temperatures. The as-prepared catalysts were characterized by means of XRD, HRTEM-EDX, XPS, NH₃-TPD, ICP-AES and CO chemisorption and tested for the thioetherification of isoprene and n-butylmercaptan. The effects of sulfuration temperature on the MoP/SiO₂ catalyst structure and thioetherification performance were investigated. The results showed that the MoP phase was still stable even at the sulfuration temperature of 400 ℃. As the sulfuration temperature increased, the acid amount of the catalysts increased while the surface metal site density decreased. As a result, in the thioetherification of isoprene and n-butylmercaptan, the C-S bond hydrogenolysis and the over-hydrogenation of isoprene were suppressed on the sulfurized catalysts, while the olefin polymerization was promoted. Relatively, the MoP/SiO₂ catalyst sulfurized at 120 ℃ had better performance for the thioetherification and the selective hydrogenation of isoprene.