摘要
以负载磷酸钼为前驱体,采用程序升温还原法制备了MoP/SiO_2催化剂,以体积分数3%H_2S/H_2对其进行了硫化处理,利用XRD、CO化学吸附、NH_3-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/SiO_2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/SiO_2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/SiO_2兼具较佳硫醚化及异戊二烯选择加氢性能。
The MoP/SiO2 catalyst was prepared from the supported M o 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 M oP 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 nbutylmercaptan,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.
作者
王立稳
李风旭
李明丰
褚阳
陈吉祥
WAND Li-wen;LI Feng-xu;LI Ming-feng;CHU Yang;CHEN Ji-xiang(Department of Catalysis Science and Engineering,Tianjin Key Laboratory of Applied Catalysis Science and Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Research Institute of Petroleum Processing,SINOPEC,Beijing 100083,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2019年第5期621-628,共8页
Journal of Fuel Chemistry and Technology
基金
石油化工催化材料与反应工程国家重点实验室(中国石油化工股份有限公司石油化工科学研究院)开放基金课题资助~~
关键词
磷化钼
硫化温度
硫醚化
选择加氢
molybdenum phosphide
sulfuration temperature
thioetherification
selective hydrogenation