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• W2088508780 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 Å. 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 of the mesostructure throughout catalysis as evidenced by a single broad reflection. Pyridine adsorption and infrared spectroscopy (IR) suggest that both Brønsted sites (∼1538 cm-1) and Lewis sites (∼1443 cm-1) coexist on the surface of these materials. The large amount of Brønsted acid sites, high BET surface areas, high acid strength Ho, and superior diffusion properties of C12 H2SO4 mesoporous Ta oxide are probably responsible for its extremely high catalytic activity and selectivity." @default.
• W2088508780 created "2016-06-24" @default.
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• W2088508780 date "2007-12-21" @default.
• W2088508780 modified "2023-09-23" @default.
• W2088508780 title "1-Hexene Isomerization over Sulfated Mesoporous Ta Oxide: The Effects of Active Site and Confinement" @default.
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• W2088508780 doi "https://doi.org/10.1021/ja076584n" @default.
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