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2D, 3D mesostructured silicas templated mesoporous manganese dioxide for selective catalytic reduction of NOx with NH3

Gao, Jinsuo, Han, Yanling, Mu, Jincheng, Wu, Shouchun, Tan, Feng, Shi, Yong, Li, Xinyong
Journal of colloid and interface science 2018 v.516 pp. 254-262
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ammonia, catalysts, catalytic activity, manganese dioxide, manganese monoxide, nitrogen oxides, physicochemical properties, porous media, sulfur dioxide, surface area, transmission electron microscopy
Employing nanocasting method, mesoporous MnO2 catalysts with large specific surface area and regular pore structure were synthesized by using three different types of mesostructure silicas (KIT-6, SBA-15, MCM-41) as hard templates. The physical and chemical properties of the three different mesostructured manganese oxide materials were comparatively and systematically characterized by using XRD, FT-IR, N2 adsorption-desorption, TEM, NH3-TPD, H2-TPR, XPS. The NH3-SCR performance of the mesoporous MnO2 was also evaluated on SCR self-assembly device. It was discovered that the mesostructure of the template would influence the amount and the kind of acid site, the reduction ability and then influence the catalytic performance of the materials. Mesoporous MnO2 templated from KIT-6 exhibited better catalytic performance than other mesoporous MnO2, indicating that the mesostructure of the materials has significant influence on the NH3-SCR performance. The KIT-6 templated MnO2 could induce 100% NOx conservation ratio range from 75 °C to 275 °C and exhibit good resistance of SO2 and H2O.