锰铈钛纳米管复合催化剂低温SCR活性和抗SO₂性能研究  

Research on Low-Temperature SCR Activity and SO2 Resistance Performance of Manganese-Cerium-Titanium Nanotube Composite Catalysts

作　　者：刘峰[1] 王秋麟[1] 黄升俞 刘占鑫 项锐 

机构地区：[1]上海理工大学能源与动力工程学院,上海

出　　处：《物理化学进展》2024年第2期200-209,共10页Journal of Advances in Physical Chemistry

摘　　要：本文采用溶胶凝胶法水热法相结合的方法制备TiO2纳米管(TiNTs)为载体MnOx-CeO2为活性组分的MnOx-CeO2/TiNTs催化剂(记作MnCe/TiNTs)用于NH3-SCR反应。结果表明,水热温度为150℃、水热时间为24 h是MnCe/TiNTs催化剂水热阶段的最佳工况。MnCe/TiNTs催化剂具有优异的低温活性和较宽的温度窗口,在150~350℃范围内NO脱除效率达95%以上。一方面,归因于TiNTs的大比表面积能促进催化剂活性组分在其内外壁面高度分散,提高催化剂氧化还原能力;另一方面,TiNTs的量子尺寸效应能使催化剂活性组分中更多原子由晶相内部暴露于表面,增加催化剂表面活性位点;此外,TiNTs的毛细作用能使反应物分子进入其管道内部,增强催化剂对反应物的捕获能力,促进NH3-SCR反应。In this paper, MnOx-CeO2/TiNTs catalysts (denoted as MnCe/TiNTs) with TiO2 nanotubes (TiNTs) as the carrier and MnOx-CeO2 as the active component were prepared by a combination of the sol-gel method and the hydrothermal method for the NH3-SCR reaction. The results showed that the MnCe/TiNTs catalysts with a hydrothermal temperature of 150 ˚C and a hydrothermal time of 24 h exhibited the best low-temperature catalytic activity and resistance to sulfur poisoning. The NO removal efficiency was above 95% in the temperature range of 150~350 °C. This is mainly attributed to the more significant enhancement of the low-temperature activity of the catalyst by TiNTs as a carrier. On the one hand, the large specific surface area of TiNTs can promote the high dispersion of catalyst active components on its inner and outer wall surfaces, which improves the redox ability of the catalyst;On the other hand, the quantum size effect of TiNTs can make more atoms in the catalyst active components exposed on the surface from the inside of the crystalline phase, which increases the active sites on the surface of the catalyst;In addition, the capillarity of TiNTs can make it easy for the reactant molecules to enter into its tubular channels, which this enhances the catalyst’s ability to capture the reactants and accelerates the catalytic reaction rate.

关 键 词：TiO₂纳米管 锰铈复合催化剂 低温脱硝 抗硫中毒 

分 类 号：O64[理学—物理化学]