Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 148, Issue -, Pages 114-122Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2013.10.049
Keywords
Low temperature NO-SCR; Nickel and manganese mixed oxides; Surface Mn4+ active species; Lewis acid sites
Funding
- National Key Basic Research Program of China (973 Program) [2013CB933200]
- National Natural Science Foundation of China [21001043, 21073059, 51372084]
- Fundamental Research Funds for the Central Universities [222201313010]
- Nano-Special Foundation for Shanghai Committee of Science and Technology [12nm0502600]
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A series of nickel-manganese bi-metal oxide catalysts of different Ni/Mn ratios were prepared by a co-precipitation method for the low temperature selective catalytic reduction (SCR) of NO with NH3 in the presence of excess O-2. The NO conversion over different catalysts decreased in the following sequence of Ni(0.4)-MnOx > MnOx >> Ni(1)-MnOx > Ni(2.5)-MnOx > NiOx. The Ni(0.4)-MnOx catalyst showed the highest catalytic activity, 85% of NO conversion at 95 degrees C and 100% from 120 to 240 degrees C, among the catalysts investigated. The TPR, XPS, NH3-TPD and in situ FTIR results revealed that Mn4+ was the main active species for SCR reaction and the addition of nickel species enhanced the surface concentration and acidity of Lewis acid sites. A possible synergetic catalytic effect was proposed for the low temperature SCR reaction through the electron transfer between Mn and Ni ions. (C) 2013 Elsevier B.V. All rights reserved.
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