Infrared and Raman imaging of heterogeneous catalysts

Stavitski, Eli; Weckhuysen, Bert M.

doi:10.1039/c0cs00064g

Cited by 178 publications

(147 citation statements)

References 69 publications

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“…Assessing morphological properties allows to review the preparation conditions of a material for better performance, since structural heterogeneities limit the screening speed in heterogeneous catalysis [116], decrease the resolution of chemical separations [26,27], and shorten the lifetime of catalysts, batteries, and fuel cells [107, 117 -119]. Fig.…”

Section: Evaluation Of New Silica Monolith Morphologiesmentioning

confidence: 99%

Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

Enke

Gläser

Tallarek

2016

Chemie Ingenieur Technik

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This work draws attention to both prospects and challenges for silica monoliths in solid-liquid catalysis at ultrahigh efficiency. The fundamental advantages of silica monoliths as support structure over particulate fixed beds and organicpolymer monoliths are illustrated as well as recent applications as flow-through microreactors for the production of fine chemicals. Preparation routes to sol-gel and porous glass-based silica monoliths featuring a hierarchical pore structure are described and their potential use as short-contact-time reactors is highlighted together with a view on the multiscale characterization and their rational design by establishing quantitative synthesis-morphology-transport relationships.

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Section: Evaluation Of New Silica Monolith Morphologiesmentioning

confidence: 99%

Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

Enke

Gläser

Tallarek

2016

Chemie Ingenieur Technik

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“…Since the active centers in catalysis often possess the dimension feature of nanometer to atomic scale, imaging catalysts at working condition has attracted much attention nowadays [120,121]. As a powerful technique, Raman imaging has been used for the preparation and characterization of catalysts [122][123][124]. However, the spatial resolution is still too low owing to the diffraction limit.…”

Section: Uv Raman Spectroscopic Study On the Phase Transformation Of mentioning

confidence: 99%

UV Raman Spectroscopic Characterization of Catalysts and Catalytic Active Sites

et al. 2014

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UV Raman spectroscopy has been demonstrated to be a powerful technique in catalysis because it can avoid the fluorescence interference occurring in visible Raman spectroscopy and concurrently enhance the Raman scattering intensity owing to the short wavelength of the excitation laser and resonance Raman effect. This article briefly reviews the recent advances in the study on heterogeneous catalysis by UV Raman spectroscopy, including the identification of isolated transition metal ions in molecular sieves, in situ study of zeolite assembly mechanisms and catalytic reaction mechanisms, and the monitoring of the surface phase transformation of metal oxide photocatalysts. UV (resonance) Raman spectroscopy, with the power of resonance enhancement for Raman signal and the advantage of high sensitivity for surface structure, coupling with in situ methodology, can provide the information about the active sites/phase and their assembling mechanisms, which are helpful for the understanding of heterogeneous catalysis and the rational design of highly active and selective catalysts.

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“…[7][8][9][10][11] In situ X-ray photoelectron spectroscopy (XPS) in the mbar pressure range is an excellent tool for studying the electronic structure of the catalyst surface under reaction conditions. 12 It has provided numerous insights into the surface and subsurface (carbides, hydrides) chemistry of the widely used Pd-based catalysts in alkyne hydrogenation.…”

Section: -4mentioning

confidence: 99%

Surface state during activation and reaction of high-performing multi-metallic alkyne hydrogenation catalysts

et al. 2011

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In partial hydrogenation of highly unsaturated compounds, high-performance heterogeneous catalysts usually consist of multi-metallic systems providing enhanced selectivity. These materials often undergo complex segregation phenomena and to understand their function, a surface-sensitive in situ methodology is crucial. Recently, we reported a novel family of ternary Cu-Ni-Fe catalysts for propyne hydrogenation with exceptional selectivity to propene. Herein, we detail our study on the surface composition and electronic state of two representative samples (Cu 2.75 Ni 0.25 Fe and Cu 3 Fe) using in situ X-ray photoelectron (XPS) and X-ray absorption (XAS) spectroscopies. Surface segregation phenomena during activation of the catalyst precursors (calcination and reduction) and hydrogenation reaction were evaluated. The multiple functions of nickel in the catalyst, which account for the extraordinary alkene selectivity, are unravelled.

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Infrared and Raman imaging of heterogeneous catalysts

Cited by 178 publications

References 69 publications

Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

UV Raman Spectroscopic Characterization of Catalysts and Catalytic Active Sites

Surface state during activation and reaction of high-performing multi-metallic alkyne hydrogenation catalysts

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