Morphology control of manganese-based catalysts for low-temperature selective catalytic reduction of NOx

•Different crystal facets are exposed with adding different capping agents.•(200) crystal facet shows the best chemical adsorption characteristic and activity.•The order of low-temperature SCR activity corresponds with that of NH3- and NO-TPD. The low-temperature selective catalytic reduction (SCR)...

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Bibliographic Details
Published in:Materials letters 2018-12, Vol.233, p.250-253
Main Authors: Jiang, Haoxi, Wang, Yaodong, Zhou, Jiali, Chen, Yifei, Zhang, Minhua
Format: Article
Language:English
Subjects:
Exposed crystal facets
Low-temperature SCR
MnO2
Nanoparticles
Nanorod
Surfaces
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Summary:•Different crystal facets are exposed with adding different capping agents.•(200) crystal facet shows the best chemical adsorption characteristic and activity.•The order of low-temperature SCR activity corresponds with that of NH3- and NO-TPD. The low-temperature selective catalytic reduction (SCR) of NOx by ammonia is an efficient purification technique to eliminate NOx from stationary combustion sources. In this paper, the different exposed crystal facets of α-MnO2 catalyst were controllably synthesized by using of capping agents of PVP, P123, HAc and CTAB. It was found that all α-MnO2 catalyst prepared using various capping agents are with the same nanorods morphology but different exposed crystal facets. The structure-activity relationship of the catalyst was investigated and the exposed crystal facets showed strong effects of on its activity of SCR for deNOx. The α-MnO2 catalyst with exposed (200) facets has the highest surface acidity, strongest NH3 and NO adsorption and therefore the best low-temperature SCR activity, with 98% NO conversion at 160 °C.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.09.004