Cobalt oxide with flake-like morphology as efficient passive NOx adsorber

Guohao Wu; Bingbing Chen; Zhifeng Bai; Qi Zhao; Zhihui Wang; Chunshan Song; Xinwen Guo; Chuan Shi

Catalysis Communications (Jan 2021)

Cobalt oxide with flake-like morphology as efficient passive NOx adsorber

Guohao Wu,
Bingbing Chen,
Zhifeng Bai,
Qi Zhao,
Zhihui Wang,
Chunshan Song,
Xinwen Guo,
Chuan Shi

Affiliations

Guohao Wu: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Bingbing Chen: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Zhifeng Bai: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Qi Zhao: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Zhihui Wang: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Chunshan Song: EMS Energy Institute, Department of Energy & Mineral Engineering and Chemical Engineering, PSU-DUT Joint Center for Energy Research, Pennsylvania State University, University Park, PA 16802, United States; Corresponding authors.
Xinwen Guo: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China; Corresponding authors.
Chuan Shi: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China; Corresponding authors.

Journal volume & issue: Vol. 149
p. 106203

Abstract

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A series of Co-based oxides were synthesized and investigated as passive NOx adsorbers (PNAs). The morphology variation of Co3O4 oxide from nanoparticle to flake shape enhanced the NOx storage efficiency (NSE) and improved the NOx desorption capability. The enhanced NSE of the flake-like sample is related to its abundant surface oxygen species and large surface area. DRIFTS and CO2-TPD experimental results indicated that Co3O4-flake and Co7Ni3Ox-flake samples with moderate basicity could store NOx as nitrite species, which facilitated NOx desorption at lower temperatures.

Published in Catalysis Communications

ISSN: 1566-7367 (Print); 1873-3905 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Chemistry
Website: https://www.journals.elsevier.com/catalysis-communications

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