摘要
通过研究钛硅分子筛TS 1在异丙醇溶剂中催化丙烯与H2O2的连续环氧化过程,考察催化剂的活性变化情况;并将失活的催化剂进行再生,活性评价表明再生后催化剂的活性基本恢复。用SEM,N2物理吸附,TG,XRD,IR和NH3 TPD等多种方法对新鲜、失活和再生后的催化剂进行表征,结果显示:催化剂失活是大分子反应副产物堵塞孔道引起的暂时性失活和部分钛流失引起的永久失活共同作用的结果。
The relationship of TS1 activity with time was investigated in a continuous epoxidation reactor, and the function curve of time to TS1 activity was observed The used catalyst was regenerated by calcination The results of the activity tests indicated that the activity of the regenerated catalyst was almost recovered The fresh, the deactivated and the regenerated were characterized by a number of techniques such as SEM, N2 physical adsorption, TG, XRD, IR and NH3TPD On the basis of the characterization, the mechanism of the deactivation was proposed The deactivation of TS1 can be attributed to the deposition of slowly diffusing organic byproducts inside TS1 channels Additionally, small amount of titanium may be leached out from the framework of the catalyst
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2003年第1期80-85,共6页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金重大项目(No 29792070)
国家重点基础研究"973"项目(G200048005)
关键词
钛硅分子筛
丙烯
环氧化
环氧丙烷
失活
催化剂
titanium silicalite (TS-1)
epoxidation of propylene
propylene oxide
deactivation.
