Size-Dependent Surface Basicity of Nano-CeO2 and Desorption Kinetics of CO2 on Its Surface,Industrial & Engineering Chemistry Research

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Size-Dependent Surface Basicity of Nano-CeO2 and Desorption Kinetics of CO2 on Its Surface
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-01 , DOI: 10.1021/acs.iecr.8b01247
Zixiang Cui ₁ , Junzhen Gan ₁ , Jie Fan ₁ , Yongqiang Xue ₁ , Rong Zhang ₁

Affiliation

The desorption kinetics of nanocatalysts which is significantly influenced by particle size has crucial effects on catalytic performances. Herein, the desorption activation energy (E_d) and the desorption pre-exponential factor (A) for CO₂ on nano-CeO₂ with different particle sizes were obtained by temperature-programmed desorption. Meanwhile, we found that the particle size has a significant effect on surface basicity. The effects of particle size on E_d, A, and surface basicity were discussed, as well as the relations between desorption kinetics and surface basicity. The results indicate that with the particle size decreasing, E_d, A, the strength, and the amount of basic sites increase, and E_d, ln A, and the amount of basic sites are linearly related with the diameter. Meanwhile, the strength and the amount of basic sites increase with the surface area increasing. The influence of particle size on desorption kinetics can be attributed to the effect of particle size on surface basicity.

中文翻译：

纳米CeO _2的尺寸依赖性表面碱度及其表面上CO _2的解吸动力学

纳米催化剂的解吸动力学受到粒径的显着影响，对催化性能具有至关重要的影响。在此，通过程序升温解吸，获得了粒径不同的纳米CeO ₂上CO ₂的解吸活化能（E _d）和解吸预指数因子（A）。同时，我们发现粒度对表面碱度有显着影响。讨论了粒径对E _d，A和表面碱度的影响，以及解吸动力学和表面碱度之间的关系。结果表明，随着粒径的减小，E _d，A，强度和碱性部位的数量增加，并且E _d，ln  A和碱性部位的数量与直径线性相关。同时，强度和碱位的数量随表面积的增加而增加。粒度对解吸动力学的影响可以归因于粒度对表面碱性的影响。

更新日期：2018-08-02

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