期刊
APPLIED SURFACE SCIENCE
卷 467, 期 -, 页码 802-810出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.10.191
关键词
Layered double hydroxides (LDHs) templates; CoMnAl mixed metal oxides; MnO2/CoAl-LDO; CoMnAl-LDO; low-temperature NH3-SCR; DeNOx
类别
资金
- National Natural Science Foundation of the China [21073131]
- Shanxi Provincial [201601D10207]
LDHs templates (marked as CoAl-MnO2-LDH and CoMnAl-CO3 -LDH) were fabricated via ion-exchange/redox reaction and hexamethylenetetramine (HMT) hydrolysis methods respectively. CoMnAl mixed metal oxides (marked as MnO2/CoAl-LDO and CoMnAl-LDO) from the as-prepared LDHs templates were novelly prepared and tested as low-temperature NH3-SCR catalysts. Catalytic evaluation pronouncedly affirmed that the catalytic performances of the as-acquired catalysts were vulnerable to the preparation method of precursor template, where MnO2/CoAl-LDO presented preferable DeNOx activity (over 90% NOx conversion), N-2 selectivity and SO2 resistance in much broader working temperature window (90-300 degrees C) than CoMnAl-LDO. Multiple characterizations revealed that the excellent catalytic performance of the MnO2/CoAl-LDO could be attributed to its higher specific surface area which could promote dispersion of abundant Mn(4+)and Co3+ species, and resultantly afforded stronger redox ability and more acid sites. Moreover, dynamic calculation confirmed that the relatively lower activation energy on MnO2/CoAl-LDO for low-temperature NH3 -SCR reaction should be closely related to the occurrence of a more rapid redox cycle and in agreement with the excellent DeNOx performance.
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