Yuxiang Rao, Junjie Kang, D. Antonelli
Jan 16, 2008
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0
Influential Citations
33
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Journal
Journal of the American Chemical Society
Abstract
The isomerization of 1-hexene at 343 K was conducted over a series of sulfated mesoporous Ta oxides with pore sizes ranging from 12 to 30 A. The results were compared to the popular industrial catalysts HY-zeolite, H-ZSM5, and Amberlyst 15. The conversion of 1-hexene to trans/cis-2-isomers can reach 95.89% in 4 h, which is roughly 2 times faster than Amberlyst 15 and 20 times faster than HY-zeolite and H-ZSM5. GC analysis confirmed that trans- and cis-2-hexene isomers formed through a double bond shift process as the only two principal products. The molar ratio of trans/cis-2-hexene isomers varies with pore size, clearly showing confinement effects in this process. The selectivity of our best material toward the trans-isomer is at least 3 times greater than that of either zeolite or Amberlyst 15. The best catalytic results in this study were achieved when using C12 H2SO4 mesoporous Ta oxide, which possesses a pKa of −8.2 and 19.8 mmol/g acid sites. The X-ray diffraction pattern showed complete retention o...