4.7 Article

Trace Co doping improves NH3-SCR performance and poisoning resistance of Ce-Mn-based catalysts

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CHEMICAL ENGINEERING JOURNAL
卷 454, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.140180

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Co-modifying; Ce-Mn-based composite metal oxide; Moisture resistance; SO2 resistance; NH3-SCR; Wide denitrification temperature window

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This study synthesized trace amounts of Co-doped Ce-Mn-based metal oxide catalysts and investigated their catalytic performance, moisture and sulfur resistance, and regeneration ability. The results showed that the Co-doped catalyst exhibited excellent activity in denitrification and catalytic combustion, as well as high sulfur resistance. Furthermore, the mechanism of the catalyst's high sulfur resistance was studied in detail.
Trace amounts of Co-doped Ce-Mn-based metal oxide catalysts with various applications were synthesized by a simple redox method. When the molar fraction of doped Co was 3 %, the catalyst possessed comparatively high contents of adsorbed oxygen species (Oads), Mn4+, Ce3+, and Co3+, and exhibited promising catalytic perfor-mance. C1M3C-3 % had a wide denitrification temperature window, achieving 80 % NO removal at 87-277 degrees C and 90 % catalytic combustion of toluene at 171 degrees C (T90% = 171 degrees C). Furthermore, the catalyst exhibited satisfactory moisture and sulfur resistance activity and can be regenerated by simple calcination (350 degrees C, 4 h). The reason for the high sulfur resistance of C1M3C-3 % was investigated in detail and a schematic diagram was provided. The NH3-SCR process was revealed to satisfy the L-H mechanism with the assistance of in situ DRIFTS. This work demonstrated that the Co-doped Ce-Mn-based catalyst had the potential for downstream of soot treatment equipment.

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