Molecular-level insights into the electronic effects in platinum-catalyzed carbon monoxide oxidation.
Molecular-level insights into the electronic effects in platinum-catalyzed carbon monoxide oxidation.
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铂催化一氧化碳氧化中电子效应的分子水平洞察
DOI:
10.1038/s41467-021-27238-z
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发表时间:
2021-11-25
影响因子:
16.6
通讯作者:
Duan X
中科院分区:
文献类型:
--
作者:
Chen W;Cao J;Yang J;Cao Y;Zhang H;Jiang Z;Zhang J;Qian G;Zhou X;Chen D;Yuan W;Duan X
A molecular-level understanding of how the electronic structure of metal center tunes the catalytic behaviors remains a grand challenge in heterogeneous catalysis. Herein, we report an unconventional kinetics strategy for bridging the microscopic metal electronic structure and the macroscopic steady-state rate for CO oxidation over Pt catalysts. X-ray absorption and photoelectron spectroscopy as well as electron paramagnetic resonance investigations unambiguously reveal the tunable Pt electronic structures with well-designed carbon support surface chemistry. Diminishing the electron density of Pt consolidates the CO-assisted O2dissociation pathway via the O*-O-C*-O intermediate directly observed by isotopic labeling studies and rationalized by density-functional theory calculations. A combined steady-state isotopic transient kinetic and in situ electronic analyses identifies Pt charge as the kinetics indicators by being closely related to the frequency factor, site coverage, and activation energy. Further incorporation of catalyst structural parameters yields a novel model for quantifying the electronic effects and predicting the catalytic performance. These could serve as a benchmark of catalyst design by a comprehensive kinetics study at the molecular level.
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影响因子:
8.6
作者:
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通讯作者:
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