首页|Revealing M(M = Cu,Co and Zr)oxides doping effects on anti-PbC^ poisoning over Mn-Ce/AC catalysts in low-temperature NH3-SCR reaction
Revealing M(M = Cu,Co and Zr)oxides doping effects on anti-PbC^ poisoning over Mn-Ce/AC catalysts in low-temperature NH3-SCR reaction
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Lead salts poisoning was a great challenge for the catalysts application in selective catalytic reduction(SCR)reaction of NOx with NH3 in stationary sources.Herein,several typical transition metal(Cu,Co and Zr)oxides modified Mn-Ce/AC catalysts were prepared by impregnation method,and the effects of Cu,Co and Zr doping on resistance PbCl2 poisoning for the catalyst were investigated.The addition of three transition metal oxides improved the PbCl2 resistance of Mn-Ce/AC catalyst and maintained excellent low-temperature denitrification activity of the catalyst.The lead resistance performance of the three metal oxides followed:Cu>Co>Zr oxides.The NO conversion of Cu-doping catalyst after PbCl2 poisoning was only ca.10% lower than that of fresh Mn-Ce/AC catalyst at 225 ℃.Cu,Co and Zr doping could decrease the loss of specific surface area caused by poisoning,while Cu-doped catalyst showed lowest crystallinity of active components.Meanwhile,the contents of Mn~(4+)and chemisorbed oxygen in Cu-doped catalyst were higher than those in Co-or Zr-doped catalysts.Cu,Co and Zr doping improved the surface acidity and redox performance of the poisoned catalysts,with Cu-doped poisoned catalyst exhibiting nearly the same surface acidity and redox performance as the fresh Mn-Ce/AC catalyst.Furthermore,Cu doping could also improve NO adsorption and was in favor to the SCR process.Besides,in situ DRIFTS results showed that the catalytic reaction pathways of all the poisoned or modified catalysts were in accordance with both Langmuir-Hinshelwood(L-H)and Eley-Rideal(E-R)mechanisms.Finally,a possible anti-PbCl2 poisoning mechanistic model of(Cu,Co and Zr)oxides modified on Mn-Ce/AC catalyst was proposed.
Transition-metal oxidesMn-Ce/AC catalystLow temperature SCRpbCl2-resistance
Rui-tang Guo、Shan Ren、Mingming Wang
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College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China
College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
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