对UiO-66对铜集群的封闭效应进行计算调查:CO2的初始化
Zechen Ye1, Wenxuan Xie2, Hongyan Chen3
1Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore. chekawis@nus.edu.sg.
在铜催化剂上,UiO-66封闭增强了二氧化碳吸附,用于酸盐生产. 封闭主要影响化步骤,而不是CO2激活本身.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
背景情况:
- 甲酸盐是二氧化碳转化为甲醇的关键中间体,特别是在铜催化剂中.
- 以前已经证明UiO-66的限制会影响铜集群上的H2解离.
- 在二氧化碳化过程中UiO-66成分的具体作用仍然不太清楚.
研究的目的:
- 阐明UiO-66部分 (Zr节点和有机链接体) 在二氧化碳化途径中的作用.
- 为了比较二氧化碳对不同尺寸 (Cu4,Cu8,Cu16,Cu32) 铜集群的非封闭式与UiO-66封闭式的成型转换.
主要方法:
- 用密度函数理论 (DFT) 的计算来研究二氧化碳化.
- 对封闭和非封闭铜集群的电子结构和反应路径进行比较.
- 关键相互作用的分析,包括Cu HOMO-CO2 LUMO+1重叠和H-吸附.
主要成果:
- 在赤裸的Cu集群上,CO2的低活性与Cu HOMO和CO2 LUMO+1.1之间不够的重叠有关.
- UiO-66部分可以改善二氧化碳吸附,但对二氧化碳激活和化提供最小的增强.
- 封闭效应通过促进H-吸附和加强C-H相互作用,显著影响化步骤.
结论:
- UiO-66的封闭主要调节CO2中的化步骤以形成转化.
- 铜集群上的内在CO2激活受到电子因素的限制,UiO-66分量没有显著改善.
- 了解这些封闭效应是设计有效的催化剂利用二氧化碳的关键.
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