title: High Catalytic Activity and Chemoselectivity of Sub-nanometric Pd Clusters on Porous Nanorods of CeO2 for Hydrogenation of Nitroarenes.
abstract: Sub-nanometric Pd clusters on porous nanorods of CeO2 (PN-CeO2) with a high Pd dispersion of 73.6% exhibit the highest catalytic activity and best chemoselectivity for hydrogenation of nitroarenes to date. For hydrogenation of 4-nitrophenol, the catalysts yield a TOF of ∼44059 h(-1) and a chemoselectivity to 4-aminophenol of >99.9%. The superior catalytic performance can be attributed to a cooperative effect between the highly dispersed sub-nanometric Pd clusters for hydrogen activation and unique surface sites of PN-CeO2 with a high concentration of oxygen vacancy for an energetically and geometrically preferential adsorption of nitroarenes via nitro group. The high concentration of surface defects of PN-CeO2 and large Pd dispersion contribute to the enhanced catalytic activity for the hydrogenation reactions. The high chemoselectivity is mainly governed by the high Pd dispersion on the support. The catalysts also deliver high catalytic activity and selectivity for nitroaromatics with various reducible substituents into the corresponding aminoarenes.
authors.affiliation: Center for Applied Chemical Research, Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Sai
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Institute of Industrial Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Chun-Ran
authors.initials: CR
authors.lastname: Chang
authors.affiliation: Institute of Industrial Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Zheng-Qing
authors.initials: ZQ
authors.lastname: Huang
authors.affiliation: Center for Applied Chemical Research, Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Material Science and Engineering, Centre of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310028, China.
authors.forename: Zhemin
authors.initials: Z
authors.lastname: Wu
authors.affiliation: Center for Applied Chemical Research, Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Center for Applied Chemical Research, Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: School of Material Science and Engineering, Centre of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310028, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Center for Applied Chemical Research, Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, China.|MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Yongquan
authors.initials: Y
authors.lastname: Qu