铈锰铂改性的4A分子筛／TiO2复合催化剂催化乙醇脱水制取乙烯.pdf

学兔兔 化 工 进 展 2009年第28卷第l1期 CHEMICAL INDUSTRY AND ENGINEERING PROGRESS ·1927· 铈锰铂改性的4A分子筛／TiO2复合催化剂 催化乙醇脱水制取乙烯 肖妍艳L ，李新军1，冯满枝 ，袁振宏 ，陈 勇 ( 中匡l科学院广州能源研究所可再生能源与天然气水合物重点实验室，广东 广州510640； 中国科学院研究生 院，北京100039) 摘 要：采用浸渍和液相沉积联合的方法制备了铈锰铂改性的4A分子筛厂rjOz复合催化剂。利用SEM、XRD和 ICP表征催化剂的物化性能，并在自制的催化剂评价装置上测试其对于乙醇脱水制取乙烯的催化性能。结果显示， 4A分子~6／TiO2复合催化剂的催化性能与4A分子筛相比显著提高，铂改性的复合催化剂能进一步促进乙烯产生， 铈一锰改性的复合催化剂比铈或锰单独改性的复合催化剂效果更好。复合催化剂中TiO 可能是通过吸收4A分子筛 上受热激发产生的电子，增加复合催化剂上的氧空穴进而促进乙烯的生成。 关键词：4A分子筛；二氧化钛；复合催化剂；改性；乙醇脱水；乙烯 中图分类号：TQ 426．94 文献标识码：A 文章编号：1000—6613(2009)11—1927—05 Catalytic dehydration of ethanol to ethylene over 4A zeolite／TiO2 composite catalysts modified with Ce，Mn and Pt XIA0 Yanyan 一，LIXinjun ，FENG Manzhi ，YUANZhenhong ，CHEN Yong ( Key Laboratory of Renewable Energy and Gas Hydrate，Guangzhou Institute of Energy Conversion，Chinese Academy ofSciences，Guangzhou 510640，Guangdong，China； Graduate University ofChineseAcademy ofSciences，Beijing 100049，China) Abstract：4A zeolite／TiO2 composite catalysts modified with Ce，Mn and Pt were prepared through impregnation and liquid phase deposition．The prepared catalysts were characterized by SEM，XRD and ICP，and their catalytic performances were evaluated with a self-made fixed bed reactor．Results showed that the catalytic performance of 4A zeolite／TiO2 composite catalyst is evidently enhanced compared with that of 4A zeolite，and the ethylene production is further improved when the composite catalyst is modified with Pt．The composite catalyst modif