超临界CO_2条件下碱性添加物对大晶粒TS-1催化丙烯环氧化反应的影响  

Effect of Alkaline Additive on Propylene Epoxidation Catalyzed by Large Grain Size TS-1 in Supercritical CO_2

作　　者：张耀日[1] 唐娜[1] 吴玉龙[2] 杨明德[2] 

机构地区：[1]天津科技大学海洋科学与工程学院,天津300457 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《天津科技大学学报》2011年第3期16-19,共4页Journal of Tianjin University of Science & Technology

基　　金：国家自然科学基金资助项目(20506011);中国石油科技创新基金项目(2010D-5006-0406)

摘　　要：为解决在超临界CO2(scCO2)反应介质中,大晶粒钛硅分子筛(TS–1)催化丙烯环氧化制备环氧丙烷(PO)的反应存在的H2O2分解和环氧丙烷选择性较低等问题,研究了添加氢氧化钠、碳酸氢钠、尿素和碳酸铵等碱性组分对反应的影响.在加入各碱性组分后,环氧丙烷选择性均有了不同程度的提高,缓解了H2O2的分解及副产物生成,在加入0.054,1,mmol碳酸铵后,H2O2转化率、PO选择性和H2O2利用率分别达到了98.7%9、5.2%和94.3%.The propylene epoxidation catalyzed by large grain size TS-1 still existed some problems in supercritical CO2（scCO2）as reaction mediums,uch as decomposition of hydrogen peroxide and poor selectivity of PO.The effect of alkaline components on the reaction was systematically investigated.As a result,alkaline components had positive effect on the selectivityt,hey can decrease the decomposition of hydrogen peroxide and increase the selectivity of PO as well.0.054,1,mmol（NH4）2CO3 additive could raise the selectivity of PO,conversion and utilization of H2O2 to 95.2%,98.7% and 94.3% respectively.

关 键 词：大晶粒TS–1 丙烯环氧化 碱性添加剂 超临界CO2 

分 类 号：TQ203.2[化学工程—有机化工]