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Preparation,characterization of H6P2W18O62/SiO2 and catalyzing synthesis of tetrahydrofuran |
1.College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China; 2. College of Chemical and Environmental Engineering, Jiujiang University, Jiujiang, Jiangxi 332005, China; 3.School of Biochemical and Environmental Engineering, Nanjing Xiaozhuang University, Nanjing, Jiangsu 211171, China |
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Abstract Phosphotungstic acids with Dawson structure(H6P2W18O62) supported on SiO2 were prepared by sol-gel method. The Dawson structure of phosphotungstic acids after loading on SiO2 and 30% H6P2W18O62 loading quantity are confirmed, and H6P2W18O62 can be well dispersed on the SiO2 support. The catalytic performance of H6P2W18O62/SiO2 was investigated by the catalytic synthesis of tetrahydrofuran from 1,4butanediol. The results of orthogonal experiments and simple factor experiments show that H6P2W18O62/SiO2 exhibits good catalytic performance for catalytic synthesis of tetrahydrofuran from 1,4butanediol. Under the optimal conditions with H6P2W18O62 of 66% relative to the dosage of 1,4butanediol, reaction temperature of 185~190 ℃ and reaction time of 40 min, the isolated yield of tetrahydrofuran can reach 91.70%. The catalyst can be reused for five times with no evident decline of catalytic performance, and the isolated yield of tetrahydro-furan is still above 90.90%.
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Received: 10 June 2012
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