A review of in situ/operando studies of heterogeneous catalytic of to methanol

被引:13
|
作者
Li, Yuanyuan [1 ]
Wu, Zili [1 ]
机构
[1] Oak Ridge Natl Lab, Chem Sci Div, Oak Ridge, TN 37831 USA
关键词
Methanol synthesis; CO2; hydrogenation; In situ; Operando characterization; High pressure; IN-SITU TEM; CO2; HYDROGENATION; CARBON-DIOXIDE; ACTIVE-SITES; X-RAY; ATMOSPHERIC-PRESSURE; CUZN CATALYSTS; PARTICLE-SIZE; COPPER; ADSORPTION;
D O I
10.1016/j.cattod.2023.02.006
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Repurposing CO2 into chemicals, one of the Carbon Dioxide Removal (CDR) strategies, still faces significant challenges in conversion and energy efficiency due to the lack of effective catalysts and processes. Fundamental understanding through in situ/operando investigations of the reaction mechanisms and catalyst structures is pivotal for developing the efficient catalysts. This paper reviews the past and recent in situ/operando studies of methanol synthesis from heterogeneous CO2 hydrogenation over a few typical catalysts including Cu-based, oxide-based, and noble-metal-based catalysts. With the development of high-pressure reactors, in situ/operando IR, X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), neutron diffraction and imaging have been used to reveal the surface intermediates and structures of working catalysts under CO2 hydrogenation conditions. On the one hand, the combined operando techniques shed light on working mechanisms for some catalytic systems. On the other hand, due to the complexity of selective CO2 hydrogenation reaction and limited sensitivity of current accessible operando techniques to the surface structure of catalysts, it is still murky about the exact nature of the active sites at the surface/interface and how different sites promote different reaction paths. It is concluded that new methodologies for differentiating signals from different sites, and the development of surface-sensitive techniques for high pressure reactions are needed for providing structural descriptors of highly active and selective CO2 conversion catalysts.
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页数:18
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