Getting Insights into the Influence of Crystal Plane Effect of Shaped Ceria on Its Catalytic Performances

被引：46
作者：
Cao, Yuan [1 ,2 ]
Zhao, Li [3 ]
Gutmann, Torsten [3 ]
Xu, Yeping [3 ]
Dong, Lin [1 ,2 ]
Buntkowsky, Gerd [3 ]
Gao, Fei [1 ,2 ]
机构：
[1] Nanjing Univ, Sch Chem & Chem Engn, Lab Mesoscop Mat Sci, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Sch Environm, Ctr Modern Anal, Jiangsu Key Lab Vehicle Emiss Control, Nanjing 210093, Jiangsu, Peoples R China
[3] Tech Univ Darmstadt, Eduard Zintl Inst Inorgan Chem & Phys Chem, Alarich Weiss Str 4, D-64287 Darmstadt, Germany
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2018年 / 122卷 / 35期
基金：
中国国家自然科学基金;
关键词：
DYNAMIC NUCLEAR-POLARIZATION; SOLID-STATE NMR; TRANSFORM INFRARED-SPECTROSCOPY; GAS SHIFT REACTION; O-17; NMR; QUADRUPOLAR NUCLEI; CEO2; NANOPARTICLES; H2O DISSOCIATION; WATER-ADSORPTION; ROOM-TEMPERATURE;
D O I：
10.1021/acs.jpcc.8b06138
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ceria nanoparticles with rodlike (ceria-rod), octahedral (ceria-octahedron), and cubic (ceria-cube) morphologies and similar crystallite dimensions have been synthesized. Transmission electron microscopy results revealed that ceria-octahedra and ceria-cubes are well-faceted, mainly enclosed with {111} and {100} facets, respectively. On the contrary, ceria-rods are not well-faceted. By CO adsorption, in situ Fourier transform infrared, and O-17 solid-state NMR (ssNMR) experiments on (H2O)-O-17-enriched ceria, it is shown that the adsorption behavior of CO/H2O is highly crystal-plane-selective. These results are well-supported by surface-enhanced dynamic nuclear polarization O-17 ssNMR A correlation between the formation of oxygen vacancies (isolated vacancies and vacancy clusters) and the surface properties of ceria is proposed.
引用
收藏
页码：20402 / 20409
页数：8
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