Insight into the properties of MnO2-Co3O4-CeO2 catalyst series for the selective catalytic reduction of NOx by C3H6 and NH3

Minh Thang Le; Sharanjit Singh; Minh Nguyen-Quang; Anh Binh Ngo; Angelika Brückner; Udo Armbruster

doi:10.1016/j.scitotenv.2021.147394

Insight into the properties of MnO₂-Co₃O₄-CeO₂ catalyst series for the selective catalytic reduction of NO_x by C₃H₆ and NH₃

Sci Total Environ. 2021 Aug 25:784:147394. doi: 10.1016/j.scitotenv.2021.147394. Epub 2021 Apr 29.

Authors

Minh Thang Le¹, Sharanjit Singh², Minh Nguyen-Quang², Anh Binh Ngo³, Angelika Brückner³, Udo Armbruster³

Affiliations

¹ Department of Organic and Petrochemical Technology, School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi 10000, Viet Nam. Electronic address: thang.leminh@hust.edu.vn.
² Department of Organic and Petrochemical Technology, School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi 10000, Viet Nam.
³ Leibniz Institute for Catalysis, Albert-Einstein-Straße 29a, D-18059 Rostock, Germany.

PMID: 34088029
DOI: 10.1016/j.scitotenv.2021.147394

Abstract

A series of MnO₂-Co₃O₄-CeO₂ catalysts with different ceria loading (0.75, 1.26 and 1.88 Ce/Mn molar ratio) were synthesized by a co-precipitation technique and the catalytic activity was tested for selective catalytic reduction of NO_x by C₃H₆ or NH₃. The catalysts were characterized by various physicochemical techniques to examine the effect of ceria loading on the properties of catalysts, such as crystallinity of metal species, surface area, porosity, and acidity using physical adsorption analysis, SEM-EDX, H₂-TPR, XRD, NH₃-TPD and in-situ FTIR spectroscopy. Ceria loading had a significant effect on the reduction of NO_x, with the catalyst having low amount of ceria loading (Ce/Mn = 0.75) showing excellent performance at low-temperature conditions, but the activity declined at higher temperature. The high ceria loading (Ce/Mn = 1.88) catalyst showed poor activity compared to the counterparts owing to the lower number of acid sites and the resulting lower adsorption capacity.

Keywords: In-situ FTIR; Manganese-cobalt-cerium metal oxides; Nitrogen oxides; Redox shuttle; Selective catalytic reduction.