共沉淀法制备的镁铝氧化物催化剂上丙酮气相缩合反应  

Gas-phase Aldol Condensation of Acetone over Mg-Al Oxides Prepared by Co-precipitation Methods

作　　者：马春香[1] 刘钢[1] 朱万春[1] 王丽霞[1] 李宇菲[1] 张文祥[1] 贾明君[1] 

机构地区：[1]吉林大学化学学院,吉林省表面和界面化学重点实验室,长春130012

出　　处：《高等学校化学学报》2009年第12期2429-2433,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20773050);吉林省科技发展计划项目(批准号:20060574,20070115)资助

摘　　要：采用共沉淀法,以氨水为沉淀剂制备了一系列具有不同Mg/Al摩尔比的镁铝氧化物催化剂,考察了它们在丙酮气相缩合反应中的催化性能,并通过XRD,XPS,ICP,TG-DTA和TPD等手段对催化剂的结构和性质进行了表征.实验结果表明,以反滴沉淀方式制备的Mg1.0AlO催化剂具有较高的反应活性和稳定性,在反应温度为573K条件下,反应85h后丙酮的转化率仍可以达到65%.镁铝氧化物表面存在一定量强度和密度相互匹配的弱碱和强碱中心对提高催化剂的活性和稳定性有利.Mg-Al oxide catalysts were prepared by co-precipitation method, used ammonia as the precipitating agent. The catalytic performances of these materials were investigated in the gas-phase Aldol condensation of acetone to isophorone. The structure and surface properties of the catalysts were characterized by means of XRD, XPS, ICP, TG-DTA and TPD. The Mg1.0AlO catalyst prepared by back-titration shows relatively high activity and stability, the conversion of acetone maintains at 65% even after 85 h at 573 K. The co-existence of a certain amount of weak basic centers and strong basic centers on the surface Mg-Al oxides may play an important role for improving the activity and stability of these catalysts.

关 键 词：丙酮 醇醛缩合 异佛尔酮 镁铝氧化物 

分 类 号：O643[理学—物理化学]