Structure–performance relationships of MnO2 nanocatalyst for the low-temperature SCR removal of NOX under ammonia

Yi Li; Yanping Li; Yuan Wan; Sihui Zhan; Qingxin Guan; Yang Tian

doi:10.1039/C6RA03108K

Structure–performance relationships of MnO₂ nanocatalyst for the low-temperature SCR removal of NO_X under ammonia†

Yi Li,*^a Yanping Li,^a Yuan Wan,^a Sihui Zhan,*^b Qingxin Guan^b and Yang Tian^c

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* Corresponding authors

^a Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China
E-mail: liyi@tju.edu.cn

^b College of Environmental Science and Engineering, Nankai University, Tianjin 300071, P. R. China
E-mail: sihuizhan@nankai.edu.cn
Fax: +86-22-23502756
Tel: +86-22-23502756

^c Department of Chemistry, Capital Normal University, Beijing 100048, P. R. China

Abstract

To investigate the corresponding relationship between catalytic efficiency and structure, MnO₂ nanomaterials (nanospheres, nanosheets, nanorods) have been prepared successfully, and were thoroughly characterized by SEM and TEM. Furthermore, the selective catalytic reduction (SCR) performance of NO_X under ammonia was used as an indicative reaction. Among the MnO₂ nanomaterials with different morphologies, it was found that their SCR activities showed an interesting variation tendency: nanospheres > nanosheets > nanorods of MnO₂. The NO conversion ratio of the MnO₂ nanospheres could reach 100% from 200 to 350 °C. Moreover, in order to study the probable mechanism for the best removal efficiency of the nanospheres, XRD, H₂-TPR, NH₃-TPD, BET, XPS and in situ DRIFTS were performed in detail. It is found that surface chemisorbed oxygen, specific surface area, reducibility and acid sites have great influence on the NO removal efficiency in the SCR reaction. In addition, how several process parameters affect the NO_X removal efficiency was carried out, such as time, H₂O and SO₂.

This article is part of the themed collection: Zeolites and 3D Porous Solids

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Article information

DOI: https://doi.org/10.1039/C6RA03108K
Article type: Paper
Submitted: 02 Feb 2016
Accepted: 23 May 2016
First published: 24 May 2016

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RSC Adv., 2016,6, 54926-54937

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Structure–performance relationships of MnO₂ nanocatalyst for the low-temperature SCR removal of NO_X under ammonia

Y. Li, Y. Li, Y. Wan, S. Zhan, Q. Guan and Y. Tian, RSC Adv., 2016, 6, 54926 DOI: 10.1039/C6RA03108K

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