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Co-Mn-Al onstoichiometric spinel-type catalysts derived from hydrotalcites for the simultaneous removal of soot and nitrogen oxides

Co-Mn-Al onstoichiometric spinel-type catalysts derived from hydrotalcites for the simultaneous removal of soot and nitrogen oxides
Co-Mn-Al onstoichiometric spinel-type catalysts derived from hydrotalcites for the simultaneous removal of soot and nitrogen oxides
A series of Co-Mn-Al nonstoichiometric spinel-type oxides were synthesized from hydrotalcites precursors prepared through co-precipitation method, and their catalytic activities for the simultaneous removal of soot and NOx were investigated. The solids were characterized by XRD, BET, H2-TPR, in situ FTIR and TPO techniques. Manganese carbonate was formed during the hydrotalcite synthesis for Mn containing precursors. Thermal decomposition at 800 °C led to nonstoichiometric spinel-type oxides for Co containing mixed oxides with specific surface areas ranged from 16 to 25 m2/g. CoMnAl ternary oxides exhibited much higher NOx storage capacities than CoAl and MnAl binary oxides, which may be due to the improved reducibility. The presence of NO in the feed gas significantly enhanced the soot oxidation activity. A cooperative effect between Co and Mn in the spinel oxides was found for the simultaneous catalytic removal of soot and NOx. The in situ FTIR spectroscopy over catalyst-soot mixtures in O2 indicated the presence of surface oxygen complexes (SOC), existing mainly as carboxyl species and phenol groups, in soot oxidation process. In the case of O2/NO atmosphere, NO was easily oxidized to NO2 over the mixed oxides. NO2, a more powerful oxidant, acts as an intermediate which oxidizes soot to CO2 at a lower temperature with itself reduced to NO or N2, resulting in the high catalytic performances in simultaneous soot-NOx removal.
comnal, nonstoichiometric spinel, hydrotalcites, mixed oxides, soot oxidation, nox removal
2164-6627
1449-1457
Wang, Zhongpeng
a0fb2552-42ae-4fa6-8496-5cdf5892638f
Zhang, Xiaomin
6fd4acae-72eb-47d4-a46e-e7174f19a561
Wang, Liguo
7a1e08ea-2738-4eda-be28-a0a6b5e03300
Zhang, Zhaoliang
c7bff934-7ca1-445f-829e-765ee1027a91
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Xiao, Tiancun
90161b4f-4483-4b4f-8db6-6614b001ac54
Umar, Ahmad
3543d84c-8797-4ad2-b3ad-149db80aeb7a
Wang, Qiang
115cf770-f960-46b0-ba8d-831fc28a1726
Wang, Zhongpeng
a0fb2552-42ae-4fa6-8496-5cdf5892638f
Zhang, Xiaomin
6fd4acae-72eb-47d4-a46e-e7174f19a561
Wang, Liguo
7a1e08ea-2738-4eda-be28-a0a6b5e03300
Zhang, Zhaoliang
c7bff934-7ca1-445f-829e-765ee1027a91
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Xiao, Tiancun
90161b4f-4483-4b4f-8db6-6614b001ac54
Umar, Ahmad
3543d84c-8797-4ad2-b3ad-149db80aeb7a
Wang, Qiang
115cf770-f960-46b0-ba8d-831fc28a1726

Wang, Zhongpeng, Zhang, Xiaomin, Wang, Liguo, Zhang, Zhaoliang, Jiang, Zheng, Xiao, Tiancun, Umar, Ahmad and Wang, Qiang (2013) Co-Mn-Al onstoichiometric spinel-type catalysts derived from hydrotalcites for the simultaneous removal of soot and nitrogen oxides. Advanced Science, Engineering and Medicine, 5 (10), 1449-1457. (doi:10.1166/sam.2013.1606).

Record type: Article

Abstract

A series of Co-Mn-Al nonstoichiometric spinel-type oxides were synthesized from hydrotalcites precursors prepared through co-precipitation method, and their catalytic activities for the simultaneous removal of soot and NOx were investigated. The solids were characterized by XRD, BET, H2-TPR, in situ FTIR and TPO techniques. Manganese carbonate was formed during the hydrotalcite synthesis for Mn containing precursors. Thermal decomposition at 800 °C led to nonstoichiometric spinel-type oxides for Co containing mixed oxides with specific surface areas ranged from 16 to 25 m2/g. CoMnAl ternary oxides exhibited much higher NOx storage capacities than CoAl and MnAl binary oxides, which may be due to the improved reducibility. The presence of NO in the feed gas significantly enhanced the soot oxidation activity. A cooperative effect between Co and Mn in the spinel oxides was found for the simultaneous catalytic removal of soot and NOx. The in situ FTIR spectroscopy over catalyst-soot mixtures in O2 indicated the presence of surface oxygen complexes (SOC), existing mainly as carboxyl species and phenol groups, in soot oxidation process. In the case of O2/NO atmosphere, NO was easily oxidized to NO2 over the mixed oxides. NO2, a more powerful oxidant, acts as an intermediate which oxidizes soot to CO2 at a lower temperature with itself reduced to NO or N2, resulting in the high catalytic performances in simultaneous soot-NOx removal.

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Published date: October 2013
Keywords: comnal, nonstoichiometric spinel, hydrotalcites, mixed oxides, soot oxidation, nox removal
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 355692
URI: http://eprints.soton.ac.uk/id/eprint/355692
ISSN: 2164-6627
PURE UUID: 2c77d950-7981-4cc9-9296-a30e874a1572
ORCID for Zheng Jiang: ORCID iD orcid.org/0000-0002-7972-6175

Catalogue record

Date deposited: 03 Sep 2013 15:44
Last modified: 20 Jul 2019 00:38

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Contributors

Author: Zhongpeng Wang
Author: Xiaomin Zhang
Author: Liguo Wang
Author: Zhaoliang Zhang
Author: Zheng Jiang ORCID iD
Author: Tiancun Xiao
Author: Ahmad Umar
Author: Qiang Wang

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