Effects of Acidic-Basic Properties on Catalytic Activity for the Oxidative Dehydrogenation of Isobutane on Calcium Phosphates, Doped and Undoped with Chromium

Takuya Ehiro; Hisanobu Misu; Shinya Nitta; Yuzo Baba; Masahiro Katoh; Yuuki Katou; Wataru Ninomiya; Shigeru Sugiyama

doi:10.1252/jcej.16we217

Chemical Reaction Engineering

Effects of Acidic-Basic Properties on Catalytic Activity for the Oxidative Dehydrogenation of Isobutane on Calcium Phosphates, Doped and Undoped with Chromium

Takuya Ehiro, Hisanobu Misu, Shinya Nitta, Yuzo Baba, Masahiro Katoh, Yuuki Katou, Wataru Ninomiya, Shigeru Sugiyama

Author information

Takuya Ehiro
Department of Chemical Science and Technology, Tokushima University
Hisanobu Misu
Department of Chemical Science and Technology, Tokushima University
Shinya Nitta
Department of Chemical Science and Technology, Tokushima University
Yuzo Baba
Department of Applied Chemistry, Graduate School of Science and Technology, Tokushima University
Masahiro Katoh
Department of Applied Chemistry, Graduate School of Science and Technology, Tokushima University
Yuuki Katou
Otake Research Laboratories, Mitsubishi Rayon Co., Ltd.
Wataru Ninomiya
Otake Research Laboratories, Mitsubishi Rayon Co., Ltd.
Shigeru Sugiyama Corresponding author
Department of Applied Chemistry, Graduate School of Science and Technology, Tokushima University
Department of Resource Circulation Engineering, Center for Frontier Research of Engineering, Tokushima University

Keywords: Oxidative Dehydrogenation, Isobutane, Calcium Hydroxyapatite, Acidic Property, Basic Property

JOURNAL RESTRICTED ACCESS

2017 Volume 50 Issue 2 Pages 122-131

DOI https://doi.org/10.1252/jcej.16we217

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Abstract

Catalytic activities of calcium hydroxyapatite (HAp) and β-type tricalcium phosphate (β-TCP) were examined for use in the oxidative dehydrogenation (ODH) of isobutane. β-TCP was catalytically inactive for the ODH of isobutane, but stoichiometric HAp afforded a high isobutene yield (5.6%). The isobutane conversion and isobutene selectivity of HAp depended on the atomic ratio of Ca/P. HAp with Ca/P=1.67 showed the highest isobutene selectivity and isobutene yield among the HAp catalysts with different Ca/P ratios. The characterization of the acidic-basic properties showed that these properties affect the catalytic performance of HAp, and that its basicity is necessary for high catalytic activity. To improve the catalytic activities of calcium phosphates, they were impregnated with Cr. Despite a much lower surface area for β-TCP, Cr-impregnated β-TCP showed a higher isobutene yield (up to 8.4%) than that of Cr-impregnated HAp. The results of the XPS measurement showed that the Cr³⁺ species on calcium phosphates, owing to basicity, worked as active sites in the ODH of isobutane.

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