燃料化学学报2016，Vol.44Issue(12)：1485-1493,9.
铈改性Silicalite-1分子筛催化剂上甲醇制丙烯反应性能研究
Catalytic performance of cerium modified Silicalite-1 molecular sieves in the conversion of methanol to propene
摘要
Abstract
A series of cerium modified Silicalite-1 molecular sieves were prepared by incipient wetness impregnation and used as the catalysts in the conversion of methanol to propene ( MTP) . The cerium modified Silicalite-1 catalysts were characterized by X-ray diffraction (XRD), N2 sorption, pyridine adsorption Fourier transform infrared spectroscopy (Py-FTIR) and temperature-programmed desorption of NH3(NH3-TPD); their catalytic performance in MTP was evaluated in a continuous flow fixed-bed micro-reactor at atmospheric pressure and 450 ℃, with a methanol weight hourly space velocity ( WHSV ) of 9 . 6 h-1 . The results showed that Silicalite-1 exhibits superior catalytic performance in MTP in terms of catalytic stability and selectivity to propene, in comparison with the HZSM-5 zeolite with a SiO2/Al2 O3 molar ratio of 200. The introduction of Ce can effectively adjust the acid properties and pore structure of Silicalite-1; modification with an appropriate concentration of Ce can reduce the amount of strong acid sites and then enhance the catalytic performance of Silicalite-1 in MTP. Over the cerium modified Silicalite-1 with a CeO2 content of 5. 0%, the selectivity to propene is increased from 31. 9% to 38. 2% and the catalytic lifetime is extended from 51 to 72 h, in comparison with those over the parent Silicalite-1 .关键词
甲醇/丙烯/Silicalite-1/铈/酸性Key words
methanol/propene/Silicalite-1/cerium/acidity分类
化学工程引用本文复制引用
黄慧文,张敏秀,陈晨,李春义,崔秋凯..铈改性Silicalite-1分子筛催化剂上甲醇制丙烯反应性能研究[J].燃料化学学报,2016,44(12):1485-1493,9.基金项目
The project was supported by the Major State Basic Research Development Program of China (973 program,2012CB215006).国家重点基础研究发展规划(973计划,2012CB215006)资助 （973 program,2012CB215006）
