Journal
CATALYSIS TODAY
Volume 179, Issue 1, Pages 123-129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2011.06.012
Keywords
Olefin metathesis; Ring opening metathesis polymerization; Hoveyda-Grubbs catalyst; Mesoporous molecular sieves; Hybrid catalysts
Funding
- Grant Agency of the Academy of Science of the Czech Republic [IAA400400805]
- Academy of Sciences of the Czech Republic [KAN100400701]
- Ministry of Education of the Czech Republic [MSM0021620857]
- Czech Science Foundation [203/08/H032]
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New hybrid olefin metathesis catalysts were prepared by immobilization of Hoveyda-Grubbs type catalyst (commercially available as Zhan catalyst-1B) on the surface of mesoporous molecular sieves differing in pore size and architecture (MCM-41, MCM-48, and SBA-15) and conventional silica for a comparison. The activity of these catalysts was tested in RCM of (-)-beta-citronellene, metathesis of 1-decene, ADMET of 1,9-decadiene, and in ROMP of cyclooctene and was found to increase significantly with the increasing pore size of the supports used. In all reactions, the activity of hybrid catalysts based on mesoporous molecular sieves was higher than that of catalyst using conventional silica as a support. In ROMP of cyclooctene, high molecular weight polymer (M-w = 300,000) in high yield (70-80%) was obtained with catalysts based on mesoporous supports, however, only 40% polymer yield was obtained using catalyst based on conventional silica. (C) 2011 Published by Elsevier B.V.
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