一步法合成二甲醚整体式催化剂的制备及反应性能研究  

Preparation and catalytic properties of a monolithic catalyst for one step synthesis of dimethyl ether

作　　者：李超[1,2] 李琢[1,2] 李建青[1] 杨成[1] 吴晋沪[1] 

机构地区：[1]中国科学院青岛生物能源与过程研究所生物燃料重点实验室,山东青岛266101 [2]中国科学院研究生院,北京100049

出　　处：《燃料化学学报》2011年第4期287-292,共6页Journal of Fuel Chemistry and Technology

基　　金：中国科学院知识创新工程重要方向项目(KGCX2-YW-329);山东省自主创新重大科技专项计划项目(06GG2209052)

摘　　要：以蜂窝陶瓷为载体、γ-Al2O3为惰性涂层、C301/HZSM-5为活性组分制备出一种整体式合成二甲醚催化剂。BET、XRD和SEM分析结果表明,活性组分均匀负载在载体表面上,催化剂具有良好的结构和织构特点。在固定床反应器中考察了整体式催化剂上CO加氢一步法合成二甲醚的反应性能,并与C301/HZSM-5颗粒(粉末)催化剂进行了比较。在温度260℃、压力4.0MPa、合成气空速1 500mL/(g.h)的条件下,整体式催化剂上CO转化率达到79.62%,二甲醚选择性为70.58%,分别比C301/HZSM-5颗粒催化剂高出7.78%和9.44%。100h的稳定性实验结果表明,整体式催化剂可以保持较高的活性和选择性,而颗粒状催化剂的活性有明显的下降。A monolithic catalyst was prepared by loading C301/HZSM-5 on honeycomb ceramic with γ-Al2O3 coating.The prepared catalysts and the supports were characterized by SEM,XRD and BET methods.It was found that a thin uniform layer of C301/HZSM-5 was coated on honeycomb ceramic,thus the monolithic catalysts showed good structural and textual properties.A comparison study between the monolithic catalyst and C301/HZSM-5 particle/powderous catalyst for one step synthesis of dimethyl ether from syngas was carried out using a fixed-bed reactor.The results showed that CO conversion and DME selectivity on the monolithic catalyst were 79.62% and 70.58%,respectively,which were 7.78% and 9.44% higher than that on C301/HZSM-5 particle catalyst under the reaction conditions of 260℃,4.0MPa and 1500mL/（g·h）.Moreover,the monolithic catalyst kept high activity and high selectivity for 100h running,while remarkable deactivation was occurred on C301/HZSM-5 catalyst.

关 键 词：C301/HZSM-5 整体式催化剂 一步法 二甲醚 

分 类 号：O643[理学—物理化学]