Journal
MOLECULAR CATALYSIS
Volume 442, Issue -, Pages 49-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mcat.2017.08.019
Keywords
Metathesis; Isomerization; Catalysis; Tungsten oxide; Magnesium oxide
Categories
Funding
- National Natural Science Foundation of China [21306227]
- Science Foundation of China University of Petroleum, Beijing [C201604]
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Different feedstocks were adopted to undergo reactions catalyzed by WO3/SiO2 and WO3/SiO2-MgO catalysts to better understand the effect of MgO on the process. The results of 1-butene self-metathesis show that, although the isomerization of 1-butene was clearly enhanced by MgO, the propylene selectivity was not improved because of insufficient 1-butene or ethylene. The main route to produce propylene in this system is through cross-metathesis of 1-butene and 2-butene. When propylene was used as the feed, more 2-butene, which was produced from propylene self-metathesis, was transformed into 1-butene by the addition of MgO, resulting in an improved metathesis performance between 1-butene and propylene. The cross-metathesis of 2-butene and ethylene, however, did not show an significant enhancement by MgO. In addition, the analysis on n-butene isomers distribution reveals that the presence of MgO is helpful in keeping the isomers at their theoretical values, leading to the good stability of the reactions. Lastly, a further comparison for the reactions between trans-2-butene and cis-2-butene demonstrates that there is little difference in their metathesis reactivity. (C) 2017 Published by Elsevier B.V.
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