甲酸
催化作用
格式化
氢化物
化学
无机化学
金属
过渡金属
二氧化碳
金属有机骨架
光化学
有机化学
吸附
作者
Krongkwan Nilwanna,Jarinya Sittiwong,Bundet Boekfa,Piti Treesukol,Sasiwadee Boonya‐udtayan,Michael Probst,Thana Maihom,Jumras Limtrakul
标识
DOI:10.1016/j.mcat.2023.113116
摘要
Conversion of carbon dioxide (CO2) to value-added chemicals is achieving increased attention from an environmental and industrial perspective because it could reduce the dependency on petroleum as raw material and also its net emission into the atmosphere. We present mechanisms for the CO2 hydrogenation on the aluminum-based metal-organic framework DUT-5 support transition metal(II)-hydride in a detailed using density functional (DFT) calculations. Two different pathways, namely, Eley-Rideal (ER) and Langmuir-Hinshelwood (LH) mechanisms are described. The ER mechanism requires activation barriers of 8.5 and 15.1 kcal/mol for the formation of formate and of formic acid steps, respectively. The first barrier is three times lower than in the LH mechanism (27.4 kcal/mol), thus favouring the ER mechanism. Supported DUT-5 MOFs are also found to have a stabilizing effect on the intermediates and transition states formed along the reaction coordinate. Finally, we screen the catalytic activities of different metals substituted into MH-DUT-5 (M = Mn, Fe, Co, Ni, and Cu) MOFs for the hydrogenation of CO2 to formic acid. It is found that NiH-DUT-5 exhibits the highest catalytic activity, based on its barriers.
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