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采用溶胶一凝胶法合成了CuO-CeO_2/TiO_2(CuCeTi)催化剂,并采用BET,XRD,XPS等分析手段对催化剂进行了表征。在固定床实验装置上研究了低温SCR气氛下催化剂对单质汞(Hg~0)的催化氧化。结果表明;SCR气氛(NO+NH_3+4%O_2)下CuCeTi催化剂可以促进Hg~0的氧化。200℃,NO与NH_3体积分数均为0.1%,空塔气速(GHSV)高达54000 h~(-1)时,CuCeTi催化剂上Hg~0的氧化效率仍可高达99%;SCR气氛可以抑制CuCeTi催化剂上Hg~0的氧化,且NO与NH_3的浓度越高,抑制作用越强,但这种抑制作用随GHSV的降低可以得到缓解甚至消除。CuCeTi催化剂在SCR气氛下具有良好的汞氧化活性与稳定性,应用该SCR催化剂有望实现燃煤烟气中NO_x与Hg~0的协同控制。
The CuO-CeO 2 / TiO 2 (CuCeTi) catalysts were synthesized by sol-gel method. The catalysts were characterized by BET, XRD and XPS. The catalytic oxidation of the elemental mercury (Hg ~ 0) in a low temperature SCR atmosphere was studied on a fixed bed reactor. The results show that CuCeTi catalyst can promote the oxidation of Hg ~ 0 under SCR atmosphere (NO + NH 3 + 4% O 2). The oxidation efficiency of Hg ~ 0 on CuCeTi catalyst can still reach as high as 99% when the volume fraction of NO and NH 3 is 0.1% and GHSV is 54000 h -1 at 200 ℃. The SCR atmosphere can restrain CuCeTi Oxidation of Hg ~ 0 on the catalyst, and the higher the concentration of NO and NH_3, the stronger the inhibition, but this inhibition can be alleviated or even eliminated with the decrease of GHSV. CuCeTi catalyst has good mercury oxidation activity and stability under SCR atmosphere. It is expected that synergistic control of NO_x and Hg ~ 0 in coal-fired flue gas will be achieved by using this SCR catalyst.