title: Catalytic Degradation of Benzene over Nanocatalysts containing Cerium and Manganese.
abstract: A Ce-Mn composite oxide possessing a rod-like morphology (with a fixed molar ratio of Ce/Mn=3:7) was synthesized through a hydrothermal method. Mn ions were doped into a CeO2framework to replace Ce ions, thereby increasing the concentration of oxygen vacancies. The formation energies of O vacancies for the Ce-Mn composite oxide were calculated by applying density functional theory (DFT). The data showed that it was easier to form an O vacancy in the composite. The catalytic behavior of the Ce-Mn composite oxide for benzene degradation was researched in detail, which exhibited a higher activity than the pure phases. Based on this, the Ce-Mn composite oxide was chosen as a supporter to load PdO nanoparticles. The activity was enhanced further compared with that of the supporter alone (for the supporter, the reaction rateR214 °C=0.68×10-4mol gcat-1s-1and apparent activation energyEa=12.75 kJ mol-1; for the supporting catalyst,R214 °C=1.46×10-4mol gcat-1s-1,Ea=10.91 kJ mol-1). The corresponding catalytic mechanism was studied through in situ Raman and FTIR spectroscopy, which indicated that the process of benzene oxidation was related to different types of oxygen species existing at the surface of the catalysts.
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 P. R. China.
authors: Zhen
authors: Z
authors: Wang
authors: State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China; University of Chinese Academy of Sciences Beijing 100049 P. R. China.
authors: Yuzhou
authors: Y
authors: Deng
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 P. R. China.
authors: Genli
authors: G
authors: Shen
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 P. R. China; University of Chinese Academy of Sciences Beijing 100049 P. R. China.
authors: Sadia
authors: S
authors: Akram
authors: State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China.
authors: Ning
authors: N
authors: Han
authors: State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China.
authors: Yunfa
authors: Y
authors: Chen
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 P. R. China.
authors: Qi
authors: Q
authors: Wang
keywords: Ce–Mn composite oxide; PdO; benzene oxidation; density functional calculations; oxygen vacancies