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Lanthanum-promoted copper-based hydrotalcites derived mixed oxides for NOx adsorption, soot combustion and simultaneous NOx-soot removal

Lanthanum-promoted copper-based hydrotalcites derived mixed oxides for NOx adsorption, soot combustion and simultaneous NOx-soot removal
Lanthanum-promoted copper-based hydrotalcites derived mixed oxides for NOx adsorption, soot combustion and simultaneous NOx-soot removal
La-promoted Cu-based hydrotalcites derived mixed oxides were prepared and their catalytic activities for NOx adsorption, soot oxidation, and simultaneous NOx-soot removal were investigated. The catalysts were characterized by XRD, DTG, BET, FTIR, H2-TPR, TPD and TPO techniques. The oxides catalysts exhibited mesoporous properties with specific surface area of 45–160 m2/g. The incorporation of La and Cu decreased the amount of basic sites due to the large decrease in surface areas. Under O2 atmosphere, La incorporation is dominant for soot oxidation activity, while Cu favors high selectivity to CO2 formation. A synergetic effect between La and Cu for catalyzed soot oxidation lies in the improved redox property and suitable basicity. The presence of NO in O2 significantly promoted soot oxidation on the catalysts with the ignition temperature decreased to about 300 °C. In O2/NO atmosphere, NO2 acts as an intermediate which oxidizes soot to CO2 at a lower temperature with itself reduced to NO or N2, contributing to the high catalytic performance in simultaneous removal of NOx and soot.
layered compounds, oxides, chemical synthesis, x-ray diffraction, catalytic properties
0025-5408
119-127
Wang, Zhongpeng
a0fb2552-42ae-4fa6-8496-5cdf5892638f
Yan, Xiaotong
13d016a6-29d7-468f-a5a4-549eb8fa070c
Bi, Xinlin
68f99717-d1f1-4802-8d7b-2d49e1ffba9f
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
Yan, Xiaotong
13d016a6-29d7-468f-a5a4-549eb8fa070c
Bi, Xinlin
68f99717-d1f1-4802-8d7b-2d49e1ffba9f
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, Yan, Xiaotong, Bi, Xinlin, Wang, Liguo, Zhang, Zhaoliang, Jiang, Zheng, Xiao, Tiancun, Umar, Ahmad and Wang, Qiang (2014) Lanthanum-promoted copper-based hydrotalcites derived mixed oxides for NOx adsorption, soot combustion and simultaneous NOx-soot removal. Materials Research Bulletin, 51, 119-127. (doi:10.1016/j.materresbull.2013.12.003).

Record type: Article

Abstract

La-promoted Cu-based hydrotalcites derived mixed oxides were prepared and their catalytic activities for NOx adsorption, soot oxidation, and simultaneous NOx-soot removal were investigated. The catalysts were characterized by XRD, DTG, BET, FTIR, H2-TPR, TPD and TPO techniques. The oxides catalysts exhibited mesoporous properties with specific surface area of 45–160 m2/g. The incorporation of La and Cu decreased the amount of basic sites due to the large decrease in surface areas. Under O2 atmosphere, La incorporation is dominant for soot oxidation activity, while Cu favors high selectivity to CO2 formation. A synergetic effect between La and Cu for catalyzed soot oxidation lies in the improved redox property and suitable basicity. The presence of NO in O2 significantly promoted soot oxidation on the catalysts with the ignition temperature decreased to about 300 °C. In O2/NO atmosphere, NO2 acts as an intermediate which oxidizes soot to CO2 at a lower temperature with itself reduced to NO or N2, contributing to the high catalytic performance in simultaneous removal of NOx and soot.

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Published date: March 2014
Keywords: layered compounds, oxides, chemical synthesis, x-ray diffraction, catalytic properties
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 363723
URI: http://eprints.soton.ac.uk/id/eprint/363723
ISSN: 0025-5408
PURE UUID: d3600801-f675-43d1-acec-cd539abd6519
ORCID for Zheng Jiang: ORCID iD orcid.org/0000-0002-7972-6175

Catalogue record

Date deposited: 01 Apr 2014 14:26
Last modified: 26 Nov 2019 01:35

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Contributors

Author: Zhongpeng Wang
Author: Xiaotong Yan
Author: Xinlin Bi
Author: Liguo Wang
Author: Zhaoliang Zhang
Author: Zheng Jiang ORCID iD
Author: Tiancun Xiao
Author: Ahmad Umar
Author: Qiang Wang

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