4.7 Article

A highly active VOx-MnOx/CeO2 for selective catalytic reduction of NO The balance between redox property and surface acidity

期刊

JOURNAL OF RARE EARTHS
卷 39, 期 11, 页码 1370-1381

出版社

ELSEVIER
DOI: 10.1016/j.jre.2020.09.006

关键词

Redox property; Surface acidity; Highly active catalyst; NH3-SCR; Rare earths

资金

  1. National Natural Science Foundation of China [21576054]
  2. Science and Technology Planning Project of Guangdong Province [2016B020241003]
  3. Natural Science Foundation of Guangdong Province [2018A030310563]
  4. Foundation of Higher Education of Guangdong Province [2018KZDXM031]

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The study has successfully designed a highly active VOx-MnOx/CeO2 material to meet the specific requirements of catalyst for selective catalytic reduction of NO with ammonia, achieving excellent activity and stability.
Excellent catalysts with low-temperature activity and relatively wide temperature window for selective catalytic reduction of NO with ammonia (NH3-SCR) are highly demanded in view of the practical treatment of NO. Herein, we have designed a highly active VOx-MnOx/CeO2 material based on the intrinsic requirement of SCR reaction for catalyst, namely redox sites and surface acid sites. The vanadium oxide and manganese oxide are highly dispersed over the ceria mesosphere via simple incipient wetness impregnation. The loading of manganese could introduce acid sites and enhance the redox property remarkably, while the loading of vanadium increases acid sites and weakens redox property. Through tentatively controlling the appropriate loading ratio of the two components, the optimal catalyst achieves a balance between redox property and surface acidity. The work shed light on the development of new SCR catalyst with superior low temperature activity, wide work temperature window and good hydrothermal stability. (C) 2021 The Authors. Published by Elsevier B.V.

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