Xu Chi, Liu Jian, Zhao Zhen, Yu Fei, Cheng Kai, Wei Yuechang, Duan Aijun, Jiang Guiyuan
State Key Laboratory of Heavy Oil, China University of Petroleum, Beijing 102249, China.
State Key Laboratory of Heavy Oil, China University of Petroleum, Beijing 102249, China.
J Environ Sci (China). 2015 May 1;31:74-80. doi: 10.1016/j.jes.2014.09.040. Epub 2015 Mar 26.
Selective catalytic reduction technology using NH3 as a reducing agent (NH3-SCR) is an effective control method to remove nitrogen oxides. TiO2-supported vanadium oxide catalysts with different levels of Ce and Sb modification were prepared by an impregnation method and were characterized by X-ray diffractometer (XRD), Brunauer-Emmett-Teller (BET), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), Raman and Hydrogen temperature-programmed reduction (H2-TPR). The catalytic activities of V5CexSby/TiO2 catalysts for denitration were investigated in a fixed bed flow microreactor. The results showed that cerium, vanadium and antimony oxide as the active components were well dispersed on TiO2, and the catalysts exhibited a large number of d-d electronic transitions, which were helpful to strengthen SCR reactivity. The V5CexSby/TiO2 catalysts exhibited a good low temperature NH3-SCR catalytic activity. In the temperature range of 210 to 400°C, the V5CexSby/TiO2 catalysts gave NO conversion rates above 90%. For the best V5Ce35Sb2/TiO2 catalyst, at a reaction temperature of 210°C, the NO conversion rate had already reached 90%. The catalysts had different catalytic activity with different Ce loadings. With the increase of Ce loading, the NO conversion rate also increased.
以NH₃作为还原剂的选择性催化还原技术（NH₃-SCR）是一种去除氮氧化物的有效控制方法。采用浸渍法制备了不同Ce和Sb改性水平的TiO₂负载氧化钒催化剂，并通过X射线衍射仪（XRD）、布鲁诺尔-埃米特-泰勒（BET）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（UV-Vis DRS）、拉曼光谱和氢气程序升温还原（H₂-TPR）对其进行了表征。在固定床流动微反应器中研究了V₅CexSby/TiO₂催化剂的脱硝催化活性。结果表明，铈、钒和锑的氧化物作为活性组分在TiO₂上分散良好，催化剂表现出大量的d-d电子跃迁，这有助于增强SCR反应活性。V₅CexSby/TiO₂催化剂表现出良好的低温NH₃-SCR催化活性。在210至400°C的温度范围内，V₅CexSby/TiO₂催化剂的NO转化率高于90%。对于最佳的V₅Ce₃₅Sb₂/TiO₂催化剂，在反应温度为210°C时，NO转化率已达到90%。不同Ce负载量的催化剂具有不同的催化活性。随着Ce负载量的增加，NO转化率也随之增加。
