Journal
REACTION KINETICS MECHANISMS AND CATALYSIS
Volume 117, Issue 2, Pages 761-771Publisher
SPRINGER
DOI: 10.1007/s11144-015-0946-9
Keywords
Isobutylene; Isoprene; Formaldehyde; Prins condensation; Silicotungstic acid
Categories
Funding
- National Natural Science Foundation of China [21473074]
- Natural Science Foundation of Science and Technology Department of Jilin Province [20130101015JC]
- Jilin Province Science and Technology research plan (key scientific research project) [20150204020GX]
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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.
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