采用共混热解法制备了不同Sn质量分数的V-Mo-Sn/Ti催化剂，通过XRD、N₂-吸附脱附和H₂-TPR等手段对催化剂进行表征，并在模拟选择性催化还原（SCR）烟气固定床中考察了不同催化剂的脱硝性能及单质汞（Hg⁰）氧化性能。结果表明，Sn的引入降低了V-Mo/Ti催化剂的比表面积和孔容，但没有改变其晶型。相比V-Mo/Ti催化剂，V-Mo-Sn/Ti催化剂具有较高的还原性能、酸性能、脱硝活性、汞氧化效率以及较多的化学吸附氧含量。此外，HCl具有促进Hg⁰氧化的作用，含Sn催化剂提升了低HCl状态下的Hg⁰氧化性能。

V-Mo-Sn/Ti catalysts with different contents of Sn are prepared through blending thermal decomposition method. XRD, N₂-adsorption and H₂-TPR are employed to characterize the catalysts. The performances of the catalysts in denitrification and oxidation activity of elemental mercury (Hg⁰) are investigated in a simulated selective catalytic reduction (SCR) flue gas fixed bed. Results show that the addition of tin causes V-Mo/Ti catalysts to have lower BET surface area and pore volume, but has little impact on their crystal structure. Compared with V-Mo/Ti catalyst, V-Mo-Sn/Ti catalysts present higher reducibility, acidity, denitrification activity and mercury oxidation efficiency, and more amount of chemical adsorbed oxygen. In addition, HCl can promote the oxidation of mercury, and Sn-containing catalyst can improve the oxidation performance to mercury in low HCl state.

纵宇浩(1987-),男,硕士,工程师,研究方向为脱硝催化剂新产品的开发及应用,zongyh@dteg.com.cn