The H6P2W18O62/TiO2composite catalyst was prepared by the combination of nonionic surfactant C18H37(OCH2CH2)10OH(Brij-76)as the template and the sol-gel method.As-synthesized composite was characterized by FT-TR,SEM,N...The H6P2W18O62/TiO2composite catalyst was prepared by the combination of nonionic surfactant C18H37(OCH2CH2)10OH(Brij-76)as the template and the sol-gel method.As-synthesized composite was characterized by FT-TR,SEM,N2 absorption-desorption and NH3-TPD.The results showed that the composite H6P2W18O62/TiO2 was mesoporous material(ca.3.3 nm),and large surface area(99.78 m2/g).Additionally,the aggregation of TiO2 particles was effectively inhibited,and the surface acidity was increased substantially.The photocatalytic elimination of monochlorobenzene was used as model reaction to evaluate the photocatalytic activity of the composite catalyst under visible light separately.Photocatalytic experimental results showed that the composite H6P2W18O62/TiO2 can effectively degradate monochlorobenzene.展开更多
文摘The H6P2W18O62/TiO2composite catalyst was prepared by the combination of nonionic surfactant C18H37(OCH2CH2)10OH(Brij-76)as the template and the sol-gel method.As-synthesized composite was characterized by FT-TR,SEM,N2 absorption-desorption and NH3-TPD.The results showed that the composite H6P2W18O62/TiO2 was mesoporous material(ca.3.3 nm),and large surface area(99.78 m2/g).Additionally,the aggregation of TiO2 particles was effectively inhibited,and the surface acidity was increased substantially.The photocatalytic elimination of monochlorobenzene was used as model reaction to evaluate the photocatalytic activity of the composite catalyst under visible light separately.Photocatalytic experimental results showed that the composite H6P2W18O62/TiO2 can effectively degradate monochlorobenzene.
基金2013年国家级大学生创新创业训练计划项目(201313256001)湖北师范学院硕士研究生创新科研基金项目(1051320130216)+1 种基金National Undergraduate Training Programs for Innovation and Entrepreneurship(201313256001)Postgraduate Innovation Scientific Research Foundation of Hubei Normal University(1051320130216)
文摘利用浸渍法以Ti O_2为载体负载Dawson型杂多酸H_6P_2Mo_9W_9O_(62)制备了催化剂H_6P_2Mo_9W_9O_(62)/TiO_2,采用XRD、IR等技术对其进行表征,以催化合成乙酸异戊酯为探针反应,系统考察了煅烧温度、杂多酸负载量、煅烧时间等制备条件对催化活性的影响。实验表明:制备催化剂的适宜条件为煅烧温度为200℃,杂多酸负载量为20%,煅烧时间为3h.利用该条件下制备的催化剂H_6P_2Mo_9W_9O_(62)/TiO_2合成乙酸异戊酯,正交实验结果表明,在n(异戊醇):n(乙酸)=1.6∶1.0,环己烷的用量为8.0 m L,催化剂H_6P_2Mo_9W_9O_(62)/TiO_2的用量为总质量的1.2%,反应时间为120 min的优化条件下,乙酸异戊酯平均收率可达74.8%.在最优反应条件下,乙酸乙酯的收率为56.3%,乙酸正丙酯的收率为74.6%,乙酸正丁酯的收率为76.1%,乙酸正戊酯的收率为90.1%.
