title: Morphology control of ceria nanocrystals for catalytic conversion of CO2 with methanol.
abstract: This paper describes the synthesis of ceria catalysts with octahedron, nanorod, nanocube and spindle-like morphologies via a template-free hydrothermal method. The surface morphologies, crystal plane and physical-chemical structures were investigated via field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and temperature-programmed desorption of ammonia and carbon dioxide (NH3-TPD and CO2-TPD). The catalytic performance over these ceria catalysts with different exposed planes were tested for dimethyl carbonate (DMC) synthesis from CO2 and methanol. The results showed that the spindle-like CeO2 showed the highest DMC yields, followed by nano-rods, nano-cubes and nano-octahedrons. A synergism among the exposed (111) plane, defect sites, and acid-basic sites was proposed to be crucial to obtaining the high reactivity of DMC formation.
authors.affiliation: Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, PR China.
authors.forename: Shengping
authors.initials: S
authors.lastname: Wang
authors.forename: Lifang
authors.initials: L
authors.lastname: Zhao
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Yujun
authors.initials: Y
authors.lastname: Zhao
authors.forename: Guanglin
authors.initials: G
authors.lastname: Zhang
authors.forename: Xinbin
authors.initials: X
authors.lastname: Ma
authors.forename: Jinlong
authors.initials: J
authors.lastname: Gong
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry; D005561:Formates / Q000138:chemical synthesis / Q000737:chemistry; D055772:Green Chemistry Technology; D000432:Methanol / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*
chemical_list: D005561:Formates; D002245:Carbon Dioxide; D002563:Cerium; C030583:ceric oxide; C023025:methyl carbonate; D000432:Methanol