The characterization of CrCe-doped on TiO2-pillared clay nanocomposites for NO oxidation and the promotion effect of CeOx
作者： Jingxin Zhang , Shule Zhang , Wei Cai , Qin Zhong
DOI: 10.1016/J.APSUSC.2012.12.169
关键词: Chromium 、 Doping 、 Space velocity 、 Catalysis 、 Inorganic chemistry 、 Materials science 、 Oxygen 、 Phase (matter) 、 Nuclear chemistry 、 X-ray photoelectron spectroscopy 、 Nanocomposite
摘要: a b s t r c A series of chromium-ceria doped on TiO2-pillared clay nanocomposites catalysts with various Cr/Ce ratios were investigated in the oxidation NO. This study aimed to not only synthesize CrCe/TiO2PILC nanocomposites, but also figure out promotion effect Ce process and interaction between chromium ceria surface TiO2-PILC. The samples characterized by XRD, SEM, TEM, XPS H2-TPR methods. best catalyst Cr(1)Ce(0.25)/TiO2-pillared yielded 69% NO NO2 conversion at 350 ◦ C (in condition GHSV = 35,400 h −1 ). With content increasing, increased significantly while when equaled 1:1, activity decreased. oxides well dispersed support. Analysis indicated that addition could promote formation chemisorbed oxygen raise quantivalency Cr. powerful electron withdrawing ability made density around Ti atoms decrease. result showed CeOx enhanced metal–support interaction. H2TPR proper reducible phase was beneficial reaction. Moreover, good resistance SO2 H2O. When H2O added feed gas, catalytic decreased removed, recovered.
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