表面活性剂对Co-Pd/TiO_2催化剂催化CH_4-CO_2两步反应合成乙酸的影响  

Surfactant effect on performance of Co-Pd/TiO_2 catalysts in synthesis of acetic acid by a two-step route

作　　者：黄颖[1] 黄伟[1] 汪正祥[1] 裴红红[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《应用化工》2010年第7期962-965,共4页Applied Chemical Industry

基　　金：国家"九七三"计划项目(2005CB221204);国家自然科学基金资助(20676085)

摘　　要：采用溶胶-凝胶法,通过添加不同表面活性剂制备了Co-Pd/TiO2催化剂,考察了其在CH4-CO2两步法合成乙酸的催化性能,用X射线粉末衍射、氨程序升温脱附和氮吸附等对其进行表征。结果表明,添加不同的表面活性剂对催化剂性能有显著的影响。表面活性剂的加入能提高催化剂的比表面积、增强表面酸性、促进活性金属在催化剂表面的分散,进而提高催化剂在两步法合成乙酸反应中的催化性能。其中以添加了阳离子表面活性剂十六烷基三甲基溴化铵的CoPd/TiO2催化剂活性最好,其乙酸的生成速率为20.06 mg/(gcat.h),碳原子选择性达到了70.80%。Co-Pd/TiO2 catalysts added with different surfactants were prepared by sol-gel method,and characterized by means of X-ray diffraction,N2 adsorption,NH3 temperature-programmed desorption.The results indicate that the surfactant has significantly influences on catalyst property.The addition of surfactant can promote the specific surface,increase the strength of catalyst surface acid,enhance the dispersion of active metal on the catalyst surface,which increases catalytic activity of synthesizing acetic acid.The Co-Pd/TiO2 catalyst with the cationic surfactant hexadecyl trimethyl ammonium bromide has higher catalytic activity,and the formation rate and selectivity of acetic acid is up to 20.06 mg/（gcat·h） and 70.80%,respectively.

关 键 词：乙酸 表面活性剂 溶胶-凝胶法 两步法 CoPd/TiO2 

分 类 号：TQ203.2[化学工程—有机化工]