氧化镁对乙苯脱氢催化剂的促进作用  

Promotion of Magnesium Oxide on Catalyst for Ethylbenzene Dehydrogenation to Styrene

作　　者：魏育才[1] 袁成龙[1] 王伟明[1] 甘玉花[1] 方维平[1,2] 杨意泉[1,2] 

机构地区：[1]厦门大学化学化工学院 [2]醇醚酯清洁生产国家工程实验室(厦门大学),福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2013年第3期382-387,共6页Journal of Xiamen University：Natural Science

摘　　要：制备了一系列不同Mg含量的Fe-K-Ce-Mg乙苯脱氢催化剂,并以XRD、CO2-TPD、NH3-TPD和BET等方法对催化剂进行表征,考察MgO对乙苯脱氢催化剂表面结构、酸碱性以及催化性能的影响.结果表明,添加适量的MgO可以增大催化剂的孔径和孔容,降低比表面积,形成的MgFe2O4新相有助于分散催化剂表面的活性相KFeO2和KFe11O17,并增加催化剂表面CeO2的含量,同时也调节催化剂表面的酸碱度,降低催化剂表观活化能,在水油体积比1.3且空速为1h-1时,MgO的质量分数为6%的催化剂活性最高.A series of Fe-K-Ce-Mg based catalysts for ethylbenzene （EB） dehydrogenation to styrene were prepared and character- ized by means of X-ray diffraction（XRD）, temperature-program desorption（CO2-TPD, N Ha-TPD） ,BET techniques. The effect of the content of magnesium oxide added on the performance of the catalysts for the reaction was investigated. The catalyst activity of the MG-6 catalyst containing 6% magnesium oxide was found to he best for the reaction under the conditions of water-oil volume ratio a- bout 1.3 and space velocity 1 h t. The characterization results showed that the pore size and pore volume of the catalyst increased as increasing the content of magnesium oxide,while, the surface area decreased by adding magnesium oxide;new phase MgFe2 04 promo- ted the formation of KFeO2 and KFe11O17 and increased the content of CeO2 on the catalyst surface,adding magnesium oxide also ad- justed the acidity-alkalinity of catalyst surface and decreased the apparent activation energy values,which was found to be responsible for the improvement of the catalyst.

关 键 词：乙苯脱氢 MGO 乙苯 苯乙烯 

分 类 号：O643.3[理学—物理化学]