Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 313, Issue 1-2, Pages 38-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2009.07.020
Keywords
Propene; Olefin metathesis; Mo/HBeta-Al2O3 catalyst; Mg; Promoting effect
Categories
Funding
- National Natural Science Foundation of China [20403017, 20773120]
- Ministry of Science and Technology of China through the National Key Project of Fundamental Research [2009CB623501, 2009CB623507]
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Promoting effects of Mg in heterogeneous Mo/HBeta-Al2O3 catalyst have been carefully studied for cross-metathesis of ethene and butene-2 to propene. The catalyst shows good stability with Mg content in the range of 1-2 wt%. Such effect may be attributed to the elimination of weak acid sites through introduction of Mg which suppresses the side olefin oligomerization reaction, as evidenced from NH3-TPD and H-1 MAS NMR results. Addition of more Mg content to 3 wt% may change the state and reducibility of Mo species, as indicated from the UV-vis. UV-Raman and H-2-TPR measurements. The increasing difficulty for the reduction of Mo(VI) species is closely related with the poor performance of 3 wt% Mg-4Mo/HBeta-30% Al2O3 catalyst in the metathesis reaction. (C) 2009 Elsevier B.V. All rights reserved.
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