Prins condensation for the synthesis of isoprene from isobutylene and formaldehyde over sillica-supported H3SiW12O40 catalysts

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• 作者：Xue Yu ; Wanchun Zhu ; Shubo Zhai ; Qiang Bao…
• 关键词：Isobutylene ; Isoprene ; Formaldehyde ; Prins condensation ; Silicotungstic acid
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：117
• 期：2
• 页码：761-771
• 全文大小：958 KB
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• 作者单位：Xue Yu (1) (2)
  Wanchun Zhu (1)
  Shubo Zhai (3)
  Qiang Bao (1)
  Dongdong Cheng (1)
  Yanyang Xia (1)
  Zhenlu Wang (1)
  Wenxiang zhang (1)
  
  1. Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University, Jiefang Road 2519, Changchun, 130021, People’s Republic of China
  2. Jilin Institute of Chemical Technology, Jilin, 132022, People’s Republic of China
  3. First Hospital of Jilin University, Changchun, 130021, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1878-5204

文摘

The Prins condensation of isobutylene with formaldehyde over scillica-supported silicotungstic acid catalysts has been investigated. The catalysts were characterized via XRD, FTIR, Py-IR, NH₃-TPD and TG–DSC techniques. It was found that the catalyst with 5 wt% silicotungstic acids loading exhibited the best isobutene conversion and isoprene selectivity, and excessive silicotungstic acid was not conducive to improve the catalytic performance. It was proposed that the concentration and strength of acid sites could affect the catalytic properties. An appropriate amount of weak Lewis acid sites were the active site for the condensation of isobutene with formaldehyde, and the medium-strong acid sites could cause the side reactions and coke deposits.