CO2 hydrogenation over Co/Al2O3 catalysts prepared via a solid-state reaction of fine gibbsite and cobalt precursors

Natpakan Srisawad; Wasu Chaitree; Okorn Mekasuwandumrong; Artiwan Shotipruk; Bunjerd Jongsomjit; Joongjai Panpranot

doi:10.1007/s11144-012-0459-8

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Reaction Kinetics, Mechanisms and Catalysis

Volume/Issue:: Volume 107: Issue 1

CO₂ hydrogenation over Co/Al₂O₃ catalysts prepared via a solid-state reaction of fine gibbsite and cobalt precursors

Authors:

Natpakan Srisawad

Natpakan Srisawad Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

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Wasu Chaitree

Wasu Chaitree Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

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Okorn Mekasuwandumrong

Okorn Mekasuwandumrong Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakorn Pathom 73000, Thailand

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Artiwan Shotipruk

Artiwan Shotipruk Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

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Bunjerd Jongsomjit

Bunjerd Jongsomjit Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

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Joongjai Panpranot

Joongjai Panpranot Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

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Pages:: 179–188

Online Publication Date:: 27 May 2012

Publication Date:: 01 Oct 2012

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s11144-012-0459-8

Keywords:: Cobalt precursors; Solid-state reaction; Cobalt aluminate; CO2 hydrogenation

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Abstract

The properties of Co/Al₂O₃ catalysts prepared by the solid-state reaction between gibbsite and various cobalt salts such as cobalt acetate (CoAc), cobalt acetylacetonate, cobalt chloride, and cobalt nitrate (CoNT) were investigated in the hydrogenation of carbon dioxide at 270 °C and atmospheric pressure and characterized by N₂ physisorption, X-ray diffraction, X-ray photoelectron spectroscopy, and H₂-temperature programmed reduction. Compared to the catalyst prepared by conventional impregnation of aqueous solution of cobalt nitrate on alumina (CoNT-Imp), the solid-state catalysts (CoNT and CoAc) exhibited much higher activity in the CO₂ hydrogenation with comparable CH₄ and CO selectivity. Unlike the impregnation catalysts, in which most of the Co₃O₄ particles/clusters were located deep inside the pores of alumina, the solid-state reaction resulted in the dispersion of cobalt oxides mostly on the external surface of alumina. As a consequence, CO₂ adsorption and dissociation to adsorbed CO and O (the initial steps in CO₂ hydrogenation) were not limited by the slow diffusion of CO₂ so high CO₂ hydrogenation activity was obtained. As revealed by the XRD and H₂-TPR results, the average crystallite size of Co₃O₄ and the metal-support interaction depended on the cobalt precursor used during the solid-state synthesis. Nevertheless, the solid-state reaction of gibbsite and cobalt chloride at 650 °C resulted in very poor CO₂ hydrogenation activity due to the formation of inactive cobalt aluminate.

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Reaction Kinetics, Mechanisms and Catalysis

Print ISSN:: 1878-5190

Online ISSN:: 1878-5204

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Reaction Kinetics, Mechanisms and Catalysis
Language	English
Size	B5
Year of Foundation	1974
Volumes per Year	1
Issues per Year	6
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	1878-5190 (Print)
ISSN	1878-5204 (Online)