Weiman Li, Haidi Liu, Yunfa Chen
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences Beijing 100190 China
University of Chinese Academy of Sciences No. 19A Yuquan Road Beijing 100049 China.
RSC Adv. 2019 Apr 16;9(21):11912-11921. doi: 10.1039/c9ra00731h. eCollection 2019 Apr 12.
In this study, different preparation methods including an oxalate route, a nano-casting strategy and a traditional co-precipitation route were applied to obtain MnOx-CeO mixed oxides for selective catalytic reduction (SCR) of NO with NH. The catalyst prepared from the oxalate route showed improved performance for NOx conversion and SO + HO durability. To further improve the SO and HO resistance of catalysts, ternary oxides were prepared from the oxalate route. The catalysts were studied by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, X-ray photoelectron spectroscopy (XPS), H temperature-programmed reduction (H-TPR), NH temperature-programmed desorption (NH-TPD), SO temperature-programmed desorption (SO-TPD), and diffuse reflectance infrared fourier transform spectroscopy ( DRIFTS). The nickel-manganese-cerium ternary oxide showed the best SO and HO durability. The reason can be ascribed to its smaller pores, amorphous structure, and moderate amount of surface Mn/oxygen species, which could decrease chemical adsorption of SO.
在本研究中，采用了不同的制备方法，包括草酸盐路线、纳米铸造策略和传统共沉淀路线，以获得用于NH3选择性催化还原（SCR）NO的MnO x -CeO混合氧化物。通过草酸盐路线制备的催化剂在NOx转化和SO2 + H2O耐久性方面表现出改进的性能。为了进一步提高催化剂的抗SO2和H2O性能，通过草酸盐路线制备了三元氧化物。通过X射线衍射（XRD）、布鲁诺尔-埃米特-泰勒（BET）表面积分析、X射线光电子能谱（XPS）、H2程序升温还原（H2-TPR）、NH3程序升温脱附（NH3-TPD）、SO2程序升温脱附（SO2-TPD）和漫反射红外傅里叶变换光谱（DRIFTS）对催化剂进行了研究。镍-锰-铈三元氧化物表现出最佳的抗SO2和H2O耐久性。原因可归因于其较小的孔径、无定形结构和适量的表面Mn/氧物种，这可以减少SO2的化学吸附。
