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Catalytic partial oxidation of methane over Ni-based catalysts derived from Ni-Mg/Al ternary hydrotalcites

Catalytic partial oxidation of methane over Ni-based catalysts derived from Ni-Mg/Al ternary hydrotalcites
Catalytic partial oxidation of methane over Ni-based catalysts derived from Ni-Mg/Al ternary hydrotalcites
Ni-based catalysts derived from Ni?Mg/Al ternary hydrotalcites with low Ni-loadings have been prepared for the partial oxidation of methane (POM) to syngas. The reducibility, surface basicity, and effects of catalyst reduction on POM reactivity over these catalysts have been explored. Temperature-programmed reduction and CO2-temperature-programmed desorption results indicate that the amount of Ni-loading and the Mg/Al molar ratio exert a remarkable influence on their reducibility but have little influence on the surface basicity, with an increase in Mg/Al ratio also lessening the base strength of the alkaline sites. Reaction temperature significantly affects the reactivity of the catalysts, and high temperature reduction of the catalysts can lead to superior reactivity to those reduced at low temperature. An in situ reduction of the catalyst has been observed in the POM reaction for catalysts reduced at low temperature. Under the optimized reaction conditions, the catalysts with Ni content from 8 wt % to 15.5 wt % show similar activity in POM reactions, and this activity is much higher than for catalysts with lower Ni-loading (4 wt %), which is explained in terms of nickel reducibility and the surface basicity of the catalysts.
0887-0624
1634-1639
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Su, Jixin
ce691d63-0992-4396-a406-22ae0512168a
Jones, Martin Oven
6599e33f-3bd4-4c7c-b81c-a9240905b0cd
Shi, Huahong
3211bb9e-a404-45bd-b86b-26d680bfac00
Xiao, Tiancun
90161b4f-4483-4b4f-8db6-6614b001ac54
Edwards, Peter P.
1c8ab595-549c-4dca-b911-a46a94183e2b
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Su, Jixin
ce691d63-0992-4396-a406-22ae0512168a
Jones, Martin Oven
6599e33f-3bd4-4c7c-b81c-a9240905b0cd
Shi, Huahong
3211bb9e-a404-45bd-b86b-26d680bfac00
Xiao, Tiancun
90161b4f-4483-4b4f-8db6-6614b001ac54
Edwards, Peter P.
1c8ab595-549c-4dca-b911-a46a94183e2b

Jiang, Zheng, Su, Jixin, Jones, Martin Oven, Shi, Huahong, Xiao, Tiancun and Edwards, Peter P. (2009) Catalytic partial oxidation of methane over Ni-based catalysts derived from Ni-Mg/Al ternary hydrotalcites. Energy & Fuels, 23, 1634-1639. (doi:10.1021/ef800933j).

Record type: Article

Abstract

Ni-based catalysts derived from Ni?Mg/Al ternary hydrotalcites with low Ni-loadings have been prepared for the partial oxidation of methane (POM) to syngas. The reducibility, surface basicity, and effects of catalyst reduction on POM reactivity over these catalysts have been explored. Temperature-programmed reduction and CO2-temperature-programmed desorption results indicate that the amount of Ni-loading and the Mg/Al molar ratio exert a remarkable influence on their reducibility but have little influence on the surface basicity, with an increase in Mg/Al ratio also lessening the base strength of the alkaline sites. Reaction temperature significantly affects the reactivity of the catalysts, and high temperature reduction of the catalysts can lead to superior reactivity to those reduced at low temperature. An in situ reduction of the catalyst has been observed in the POM reaction for catalysts reduced at low temperature. Under the optimized reaction conditions, the catalysts with Ni content from 8 wt % to 15.5 wt % show similar activity in POM reactions, and this activity is much higher than for catalysts with lower Ni-loading (4 wt %), which is explained in terms of nickel reducibility and the surface basicity of the catalysts.

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Published date: 2009
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 352785
URI: http://eprints.soton.ac.uk/id/eprint/352785
ISSN: 0887-0624
PURE UUID: 738726a8-121f-45b7-97a3-a2bfc02b878f
ORCID for Zheng Jiang: ORCID iD orcid.org/0000-0002-7972-6175

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Date deposited: 21 May 2013 10:24
Last modified: 26 Nov 2019 01:35

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Contributors

Author: Zheng Jiang ORCID iD
Author: Jixin Su
Author: Martin Oven Jones
Author: Huahong Shi
Author: Tiancun Xiao
Author: Peter P. Edwards

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