Kang Ki Hyuk, Lee Chang Hoon, Kim Dong Baek, Jang Boknam, Song In Kyu
J Nanosci Nanotechnol. 2014 Nov;14(11):8693-8. doi: 10.1166/jnn.2014.9948.
XNiO/CeO2(0.7)-ZnO(0.3) (X = 0, 1, 5, 10, and 15) nano-catalysts were prepared by a wet impregnation method with a variation of NiO content (X, wt%). The prepared catalysts were then applied to the direct synthesis of dimethyl carbonate from methanol and carbon dioxide. Successful formation of XNiO/CeO2(0.7)-ZnO(0.3) nano-catalysts was confirmed by XRD and ICP-AES analyses. Acidity and basicity of XNiO/CeO2-ZnO were measured by NH3-TPD (temperature-programmed desorption) and CO2-TPD experiments, respectively, with an aim of elucidating the effect of acidity and basicity of the catalysts on the catalytic performance in the reaction. It was revealed that the catalytic activity of XNiO/CeO2(0.7)-ZnO(0.3) was closely related to both acidity and basicity of the catalysts. The amount of dimethyl carbonate produced over XNiO/CeO2(0.7)-ZnO(0.3) increased with increasing acidity and basicity of the catalysts. Thus, both acidity and basicity of the catalysts played important roles in determining the catalytic performance in the direct synthesis of dimethyl carbonate from methanol and carbon dioxide.
采用湿浸渍法制备了不同NiO含量（X，wt%）的XNiO/CeO2(0.7)-ZnO(0.3)（X = 0、1、5、10和15）纳米催化剂。然后将制备的催化剂应用于由甲醇和二氧化碳直接合成碳酸二甲酯的反应中。通过XRD和ICP - AES分析证实成功制备了XNiO/CeO2(0.7)-ZnO(0.3)纳米催化剂。分别通过NH3 - TPD（程序升温脱附）和CO2 - TPD实验测量了XNiO/CeO2 - ZnO的酸度和碱度，目的是阐明催化剂的酸度和碱度对反应催化性能的影响。结果表明，XNiO/CeO2(0.7)-ZnO(0.3)的催化活性与催化剂的酸度和碱度密切相关。随着催化剂酸度和碱度的增加，XNiO/CeO2(0.7)-ZnO(0.3)上生成的碳酸二甲酯量增加。因此，催化剂的酸度和碱度在由甲醇和二氧化碳直接合成碳酸二甲酯的反应中对催化性能的决定起着重要作用。
