Effects of MO_x（M=Mn,Cu,Sb,La）on V-Mo-Ce/Ti selective catalytic reduction catalysts

Daojun Zhang^1,2，Ziran Ma²，Baodong Wang²，Qi Sun²，Wenqiang Xu²，Tao Zhu³

1. State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology2. National Institute of Clean-and-Low-Carbon Energy3. School of Chemical & Environmental Engineering,China University of Mining & Technology (Beijing)

摘 要：A series of MO_x-V₂O₅-MoO₃-CeO₂/TiO₂（M=Mn,Cu,Sb,and La） catalysts were prepared via an impregnation method.The physico-chemical properties of the catalysts were characterized and their NH₃-SCR of NO performance was compared.The Mn-loaded catalyst（Mn5V1Mo3Ce7/Ti） exhibits a large number of acid sites of varying strength,and together with good reducibility of the catalyst,contributes to the optimal SCR performance.The sulphate species formed in the presence of SO₂ significantly enhance the H₂O and SO₂ tolerance of Mn5V1Mo3Ce7/Ti.The Cu-loaded catalyst（Cu5V1Mo3Ce7/Ti）demonstrates potential in flue gas applications in the absence of SO₂ at low temperatures because of the excellent redox ability observed and the high degree of weak acid sites.The Sb and La loaded catalysts（Sb5V1Mo3Ce7/Ti and La5V1Mo3Ce7/Ti）,especially La5V1Mo3 Ce7/Ti,exhibit the largest number of acid sites and the lowest reducibility,and therefore,may be suitable for use in high temperature denitrification applications.

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