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Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites

Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites
Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites
Novel Cu-Mg/Al mixed oxides (designated as i-CMAO-800) were prepared by calcinations of Cu-Mg/Al hydrotalcites [(Cu2+ +Mg2+)/Al3+= 3] at 800 °C. Their performance for the catalytic combustion of methane was investigated. The oxides and their precursors were characterized by XRD, TG-DSC, TPR and N2 adsorption/desorption techniques. The results showed that BET surface areas and the stability of the resultant oxides were greatly influenced by the copper contents in hydrotalcite precursors, bringing about difference in their activities for methane catalytic combustion. XRD results indicated that Cu was highly dispersed in hydrotalcite precursors in case of low copper contents, (Cu 40 wt%). For higher Cu contents, Cu(OH)2 was formed, and, consequently, a separate phase of CuO was detected in the oxide catalysts after calcination. As indicated by the TG-DSC results, different decomposition behaviors were observed for various hydrotalcites. Thermal calcination promoted the formation of copper aluminates and segregation of CuO from the bulk phases. TPR results showed 15CMAO-800 has the highest reduction rate, and the catalytic activities of iCMAO-800 mixed oxides depend on both the reduction rates and the amounts of copper ions in mixed oxides. The catalyst 15-CMAO-800 showed the best performance.
1011-372X
157-163
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Hao, Zhengping
ddb48896-0a13-41b1-9eb0-bc7ec1c4cdec
Yu, Junjie
1557c0a2-0a37-4ffc-85f1-17498b63865f
Hou, Hongxia
c370ea77-2b63-4ad7-8df8-0f619ddbc009
Hu, Chun
64ad5d38-5768-480a-97a0-739cab58f4c0
Su, Jixin
ce691d63-0992-4396-a406-22ae0512168a
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Hao, Zhengping
ddb48896-0a13-41b1-9eb0-bc7ec1c4cdec
Yu, Junjie
1557c0a2-0a37-4ffc-85f1-17498b63865f
Hou, Hongxia
c370ea77-2b63-4ad7-8df8-0f619ddbc009
Hu, Chun
64ad5d38-5768-480a-97a0-739cab58f4c0
Su, Jixin
ce691d63-0992-4396-a406-22ae0512168a

Jiang, Zheng, Hao, Zhengping, Yu, Junjie, Hou, Hongxia, Hu, Chun and Su, Jixin (2005) Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites. Catalysis Letters, 99 (3-4), 157-163. (doi:10.1007/s10562-005-2108-6).

Record type: Article

Abstract

Novel Cu-Mg/Al mixed oxides (designated as i-CMAO-800) were prepared by calcinations of Cu-Mg/Al hydrotalcites [(Cu2+ +Mg2+)/Al3+= 3] at 800 °C. Their performance for the catalytic combustion of methane was investigated. The oxides and their precursors were characterized by XRD, TG-DSC, TPR and N2 adsorption/desorption techniques. The results showed that BET surface areas and the stability of the resultant oxides were greatly influenced by the copper contents in hydrotalcite precursors, bringing about difference in their activities for methane catalytic combustion. XRD results indicated that Cu was highly dispersed in hydrotalcite precursors in case of low copper contents, (Cu 40 wt%). For higher Cu contents, Cu(OH)2 was formed, and, consequently, a separate phase of CuO was detected in the oxide catalysts after calcination. As indicated by the TG-DSC results, different decomposition behaviors were observed for various hydrotalcites. Thermal calcination promoted the formation of copper aluminates and segregation of CuO from the bulk phases. TPR results showed 15CMAO-800 has the highest reduction rate, and the catalytic activities of iCMAO-800 mixed oxides depend on both the reduction rates and the amounts of copper ions in mixed oxides. The catalyst 15-CMAO-800 showed the best performance.

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Published date: February 2005
Organisations: Faculty of Engineering and the Environment

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Local EPrints ID: 352782
URI: http://eprints.soton.ac.uk/id/eprint/352782
ISSN: 1011-372X
PURE UUID: d915d7ae-b18e-4891-a571-aca0a2d33820
ORCID for Zheng Jiang: ORCID iD orcid.org/0000-0002-7972-6175

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Date deposited: 10 Jun 2013 15:11
Last modified: 03 Dec 2019 01:36

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Author: Zheng Jiang ORCID iD
Author: Zhengping Hao
Author: Junjie Yu
Author: Hongxia Hou
Author: Chun Hu
Author: Jixin Su

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