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通过溶胶-凝胶法制得氟掺杂氧化钛载体,然后负载活性组分氧化钒,制得了不同氟掺杂量的氧化钒/氧化钛催化剂,并对这些催化剂进行了活性测试和表征.结果表明:氟掺杂能大幅度提高催化剂的低温选择性催化还原(SCR)性能,且氟掺杂量为[F]/[Ti]=1.35×10-2时,催化活性最好;在453 K时,该催化剂对NO的脱除效率为61%,在483 K时,NO的脱除效率为97%;SO2和H2O对氟掺杂催化剂上的低温SCR反应存在协同抑制效应,且该抑制效应是可逆的;催化剂活性得到提高的原因在于,氟掺杂增强了活性组分氧化钒与载体氧化钛之间的相互作用,有利于提高催化剂的氧化还原性能,同时促进了超氧自由基的形成,有利于中间产物NO2-和NO3-的生成.
The fluorine-doped titania carrier was prepared by sol-gel method, and then the active component vanadium oxide was loaded to prepare the vanadium oxide / titania catalyst with different fluorine doping amount. The activity of these catalysts was tested and characterized. : Fluorine doping can greatly improve the low temperature selective catalytic reduction (SCR) performance of the catalyst, and the best catalytic activity is obtained when the content of fluorine is [F] / [Ti] = 1.35 × 10-2; , The NO removal efficiency of the catalyst is 61%, and the removal efficiency of NO is 97% at 483 K. The synergistic inhibition effect of SO2 and H2O on the SCR reaction of low-temperature fluorine-doped catalysts exists and the inhibition effect is Reversible. The reason for the increase of the catalyst activity is that fluorine doping enhances the interaction between the vanadium oxide as active component and the carrier titanium oxide, which is favorable for improving the redox performance of the catalyst and promoting the formation of superoxide radicals. Conducive to the formation of NO2- and NO3-.