期刊
FUEL
卷 319, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.123763
关键词
NH3-SCR reaction; Sm and Fe Co-doping; Pb-resistance; Mn-Ce/AC catalyst; Low-temperature SCR
资金
- National Natural Science Foundation of China [51874058, 52174298]
- Chongqing Talents: Exceptional Young Talents Project [CQYC201905017]
- Fund of Chongqing Science and Technology [cx2020028, cstc2019jscx-msxmX0215]
By co-doping Sm and Fe into the Mn-Ce/AC catalyst, the resistance to Pb poisoning was enhanced, leading to improved low-temperature NH3-SCR performance.
A novel anti-Pb poisoning Sm and Fe co-doped Mn-Ce/AC catalyst was prepared by impregnation method for low-temperature NH3-SCR of NO reaction. Maintaining the excellent low-temperature activity of Mn-Ce/AC catalyst, Sm and Fe co-doping remarkably enhanced the catalyst's Pb-resistance with NO conversion up to 77%. Sm and Fe co-doped poisoning-catalysts exhibited large specific surface area and pore volume, and the crystallinity of the MnOx and CeOx reduced. The redox properties and surface acidity of the lead poisoned SmFeMnCe/AC catalyst were effectively retained, which could promote NO oxidation and NH3 activation, further benefiting the SCR reaction. In situ DRTFTS results indicated that the low-temperature NH3-SCR mechanism of all poisoned catalysts followed both L-H mechanism and E-R mechanism, and the L-H mechanism was dominated. On the one hand, the extraordinary lead resistance of Sm weakened the damage of lead species on the physicochemical properties of the catalyst; on the other hand, the high oxidation properties and surface acidity of Fe enhanced the catalytic activity of the poisoned catalyst. Finally, a possible synergistic mechanism model of Sm and Fe co-doping on Mn-Ce/AC catalyst against Pb-poisoning was proposed.
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