Issue 60, 2016

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

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 NOX 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 NOX removal efficiency was carried out, such as time, H2O and SO2.

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

Supplementary files

Article information

Article type
Paper
Submitted
02 ⴱⵕⴰ 2016
Accepted
23 ⵎⴰⵢ 2016
First published
24 ⵎⴰⵢ 2016

RSC Adv., 2016,6, 54926-54937

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