期刊论文

Fan, G.-Z.

中文

化学工程

1005-9954

2009

37

10

36-38+42

10.3969/j.issn.1005-9954.2009.10.010

(2007ABA369):湖北省自然科学基金资助项目 (080989):武汉工业学院***科研启动项目

本校为第一且通讯机构

以正硅酸乙酯和钛酸正丁酯作前体,通过均匀沉淀法制备了SiO2-TiO2复合氧化物,并采用X射线粉末衍射（XRD）对复合氧化物进行了表征。采用浸渍制备了复合氧化物负载的钯催化剂Pd/SiO2-TiO2,并考察了负载催化剂在Suzuki反应中的催化性能。当投料摩尔比n（Pd）∶n（PhBr）∶n[PhB（OH）2]∶n（K2CO3）为1∶70∶105∶140,Ti/Si摩尔比和钯质量分数分别为0.5和2.0%时,回流反应10 h,联苯产率达92.8%。负载催化剂通过简单过滤即可回收利用,在5次循环使用过程中,催化活性除第1次有明显降低外,其后基本保持不变。

SiO2-TiO2 mixed oxide was prepared by the homogeneous precipitation method using tetraethoxysilane and tetrabutyl titanate as precursors, and the structure of the products was characterized by X-ray diffraction (XRD). Palladium catalyst supported on Pd/SiO2-TiO2 was prepared by incipient wetness impregnation method and the catalytic characteristic in Suzuki reaction was investigated. The yield of biphenyl reaches 92.8% under the conditions that the molar ratio of n(Pd): n(PhBr): n[PhB(OH)2]: n(K2CO3)=1: 70: 105: 140, the molar ratio of Ti/Si is 0.5 and the mass fraction of palladium is 2.0%, a...