新型超细包覆型催化剂的制备及催化苯酚氧化羰基化合成碳酸二苯酯  

PREPARATION OF NOVEL ULTRAFINE EMBEDDED CATALYST FOR OXIDATIVE CARBONYLATION OF PHENOL TO DIPHENYL CARBONATE

作　　者：薛伟[1] 张敬畅[1] 王延吉[2] 赵新强[2] 赵茜[2] 

机构地区：[1]北京化工大学理学院,北京100029 [2]河北工业大学绿色化工与高效节能河北省重点实验室,天津300130

出　　处：《化工学报》2004年第12期2076-2081,共6页CIESC Journal

基　　金：国家自然科学基金项目 (No 2 0 1760 0 8);天津市自然科学基金项目 (No 0 0 3 80 12 11)共同资助~~

摘　　要：A novel catalytic material, ultrafine silica embedded catalyst, was prepared through the hydrolysis of tetraethoxysilane (TEOS) in W/O microemulsion, which was composed of cyclohexane, polyoxyethylene (10) nonylphenyl (NP-10), hexanol and aqua ammonia of PdCl 2 and Cu(OAc) 2.It was found that the active species was wholly or partly embedded in the spherical silica particles with diameters in the range of 40—120 nm.The catalytic behavior of the catalyst in oxidative carbonylation of phenol to diphenyl carbonate (DPC) was studied. Under the optimized conditions(80℃,3.9 MPa and 8 h), the yield of DPC was 35.4%. In comparison with the catalysts prepared by the impregnation and sol-gel method, the ultrafine embedded catalyst showed high activity and long service time.When the catalyst was used at 80 ℃,3.9 MPa and 4 h for 4 times, the yield of DPC was 25.2%, 16.5%, 14.5% and 13.4%, respectively.A novel catalytic material, ultrafine silica embedded catalyst, was prepared through the hydrolysis of tetraethoxysilane (TEOS) in W/O microemulsion, which was composed of cyclohexane, polyoxyethylene (10) nonylphenyl (NP-10), hexanol and aqua ammonia of PdCl2 and Cu(OAc)2. It was found that the active species was wholly or partly embedded in the spherical silica particles with diameters in the range of 40-120 nm. The catalytic behavior of the catalyst in oxidative carbonylation of phenol to diphenyl carbonate (DPC) was studied. Under the optimized conditions (80°C, 3.9 MPa and 8 h), the yield of DPC was 35.4%. In comparison with the catalysts prepared by the impregnation and sol-gel method, the ultrafine embedded catalyst showed high activity and long service time. When the catalyst was used at 80°C, 3.9 MPa and 4 h for 4 times, the yield of DPC was 25.2%, 16.5%, 14.5% and 13.4%, respectively.

关 键 词：超细包覆型催化剂 W/O微乳液 碳酸二苯酯 氧化羰基化 

分 类 号：O648.1[理学—物理化学] TQ032[理学—化学]