Mechanisms and Energetics of Complete Ethylene Oxidation on a PdAu Bimetallic Catalyst from a Theoretical Perspective
Mechanisms and Energetics of Complete Ethylene Oxidation on a PdAu Bimetallic Catalyst from a Theoretical Perspective
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理论视角下 PdAu 双金属催化剂上乙烯完全氧化的机理和能量
DOI:
10.1021/acs.jpcc.2c01277
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发表时间:
2022-05
影响因子:
3.7
通讯作者:
Haisheng Ren
中科院分区:
文献类型:
--
作者:
Yuyue Gao;Xiaoliu Huo;Tao Li;Rongpei Jiang;Quan Zhu;Haisheng Ren
The complete catalytic oxidation of ethylene at low temperatures is of great significance for the preservation of agricultural products during transportation. Au-based catalysts with various Pd ensembles have recently shown promise in catalytic oxidation. In this work, the catalytic mechanisms and energetics for ethylene oxidation on a PdAu bimetallic catalyst with a second neighboring Pd configuration were systematically investigated from a theoretical perspective. It is found that the PdAu bimetallic catalyst can produce seven adsorption sites for ethylene oxidation. The entire reaction network consists of four processes: C–O bond formation, C–C bond cleavage, CO2formation, and H2O formation, which involve a total of 21 adsorbed species and 35 elementary reactions. Among the several possible oxygenates, CH2CO is an important intermediate and has the lowest energy barrier of the C–C bond cleavage. The second neighboring Pd configuration makes O active in C–O bond formation. Finally, the most energetically favorable pathway of complete ethylene oxidation was determined as CH2CH2→ CH2CH2O(OME) → CH2CHO → CH2CO → CH2→ CH → CHO → CO → CO2. In all, the PdAu bimetallic catalyst shows high activity for the complete oxidation of ethylene. We hope that this comprehensive work can provide a deeper understanding of the hydrocarbon oxidation on bimetallic catalysts.
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影响因子:
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通讯作者:
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影响因子:
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