Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, PR China.
Nanoscale. 2013 Jun 21;5(12):5582-8. doi: 10.1039/c3nr00831b.
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.
本文通过无模板水热法合成了具有八面体、纳米棒、纳米立方体和纺锤形形态的氧化铈催化剂。通过场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）、X 射线衍射（XRD）和氨和二氧化碳程序升温脱附（NH3-TPD 和 CO2-TPD）研究了表面形态、晶面和物理化学结构。在不同暴露面上的这些氧化铈催化剂上测试了用于从 CO2 和甲醇合成碳酸二甲酯（DMC）的催化性能。结果表明，具有纺锤形的 CeO2 表现出最高的 DMC 产率，其次是纳米棒、纳米立方体和纳米八面体。提出暴露（111）面、缺陷位和酸碱位之间的协同作用对于获得高 DMC 形成反应性至关重要。
