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V-K/γ-Al2O3 catalyst with sulfur introduction: high-performance for non-oxidative dehydrogenation of isobutane

Abstract

Sulfur was first introduced into V-K/γ-Al2O3 catalysts, and the performance for non-oxidative dehydrogenation (DH) of isobutane was promoted remarkably. After sulfidation, the isobutene yield increased from 29.6% to 49.8%. Many attempts have been made to thoroughly explain the promoting effect of sulfidation to DH activity over V-K/γ-Al2O3 catalysts. Our studies demonstrate that both metallic and acid properties of vanadium-based catalysts were affected by sulfidation. The introduce of sulfur with lower electronegativity made the bond energy of V-S lower than that of V-O. Therefore, it became easier for vanadium species to get reduced after sulfidation. More V3+ and V4+ species, serving as active DH sites, appeared on surface of catalysts. After sulfidation, the increased acid strength resulted in easily activating the C-H bond of isobutane, which also contributed to the increase of isobutane conversion. Meanwhile, the decrease of acidic sites inhibited side reactions, which devoted higher isobutene selectivity to the sulfide catalyst compared to the oxidation state. The sulfide V-K/γ-Al2O3 catalyst, presenting ideal activity, stability and space-time yield, provides a promising alternative to produce environmental friendly and economically industrial DH catalysts.

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Publication details

The article was received on 30 Jun 2018, accepted on 12 Aug 2018 and first published on 13 Aug 2018


Article type: Paper
DOI: 10.1039/C8CY01354C
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    V-K/γ-Al2O3 catalyst with sulfur introduction: high-performance for non-oxidative dehydrogenation of isobutane

    Y. Tian, Y. Liu, X. Liu and Z. Yan, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01354C

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