Abstract
Vanadium oxide supported on MSU-1, with VOx loading ranging from 2.5 to 17.5 wt. %, was developed as a highly active catalyst in dehydrogenation of isobutane with CO2. The obtained catalysts of VOx/MSU-1 were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, and H2-temperature programmed reduction (H2-TPR) methods and the results showed that the large surface area of MSU-1 was favorable for the dispersion of VOx species and the optimal loading of VOx was 12.0 wt. %. Meanwhile, the catalytic activity of VOx/MSU-1 was investigated, and VOx/MSU-1 with 12.0 wt. % VOx content was found to be the best one, with the conversion of isobutane (58.8%) and the selectivity of isobutene (78.5%) under the optimal reaction conditions. In contrast with the reaction in the absence of CO2, the presence of CO2 in the reaction stream could obviously enhance the isobutane dehydrogenation, which raised the conversion of reaction and the stability of VOx/MSU-1.
Highlights
IntroductionDehydrogenation of lower alkanes to alkenes is always attractive research around the world [1,2,3,4]
Dehydrogenation of lower alkanes to alkenes is always attractive research around the world [1,2,3,4].With the use of downstream products of isobutene increasing [5,6], the demand of isobutene is rapidly growing, so the dehydrogenation of isobutane to isobutene is becoming one of the important ways to produce isobutene
Compared with undoped MSU-1, the intensity of diffraction peak of VOx -containing MSU-1 gradually decreased with VOx content increasing
Summary
Dehydrogenation of lower alkanes to alkenes is always attractive research around the world [1,2,3,4]. The direct dehydrogenation of isobutane to isobutene has been achieved in industrialization [7], but there are still some serious technical problems, such as high production cost, complex processing, and deactivation of the catalyst by carbon deposition. The oxidative dehydrogenation of isobutane (ODB) has received more and more attention, recently [8,9]. Research of Ma et al [25] on V2 O5 /Al2 O3 and V2 O5 /SiO2 catalyst showed that vanadium species with higher dispersion had better catalytic activity. In the early work of our group, the catalysts had been prepared by loading chromium on MSU-x for catalytic dehydrogenation of propane and ethane [27,28,29,30], which had showed high catalytic activity. The catalytic performance of VOx /MSU-1 was investigated for the dehydrogenation of isobutane with or without CO2
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