TY - JOUR
T1 - Insights into the structure-activity relationships of highly efficient CoMn oxides for the low temperature NH3-SCR of NOx
AU - Zhao, Qi
AU - Chen, Bingbing
AU - Li, Jin
AU - Wang, Xianbin
AU - Crocker, Mark
AU - Shi, Chuan
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/11/15
Y1 - 2020/11/15
N2 - A series of CoMn composite oxides with lamellar morphology was prepared by co-precipitation for low temperature selective catalytic reduction of NOx with NH3. CoMn oxide calcined at 250 °C (CoMn-LS-250) exhibited high activity, giving 91 % NOx conversion at 60 °C with good SO2 resistance (300 °C). The excellent activity of CoMn-LS-250 is related to its abundance of Lewis acid sites as well as its superior redox ability; consequently, the catalyst is able to trap NH3 and oxidize NH3(ad) to NH2(ad), this being the initial step for NH3-SCR of NOx. NH2(ad) subsequently combines with NO to form the key intermediate, NH2NO(ad), which decomposes at low temperature (ca. 85 °C) with release of N2. Residual OH(ad) reacts with gaseous O2 to complete the redox cycle.
AB - A series of CoMn composite oxides with lamellar morphology was prepared by co-precipitation for low temperature selective catalytic reduction of NOx with NH3. CoMn oxide calcined at 250 °C (CoMn-LS-250) exhibited high activity, giving 91 % NOx conversion at 60 °C with good SO2 resistance (300 °C). The excellent activity of CoMn-LS-250 is related to its abundance of Lewis acid sites as well as its superior redox ability; consequently, the catalyst is able to trap NH3 and oxidize NH3(ad) to NH2(ad), this being the initial step for NH3-SCR of NOx. NH2(ad) subsequently combines with NO to form the key intermediate, NH2NO(ad), which decomposes at low temperature (ca. 85 °C) with release of N2. Residual OH(ad) reacts with gaseous O2 to complete the redox cycle.
KW - CoMn oxide
KW - NH-SCR
KW - NO
KW - Structure-Activity relationships
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U2 - 10.1016/j.apcatb.2020.119215
DO - 10.1016/j.apcatb.2020.119215
M3 - Article
AN - SCOPUS:85086759211
SN - 0926-3373
VL - 277
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 119215
ER -