<i>In‐situ</i>Infrared Spectroscopy on Model Catalysts

Mudiyanselage, Kumudu; Stacchiola, Darı́o

doi:10.1002/9781118355923.ch8

Cited by 12 publications

(6 citation statements)

References 70 publications

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“…This is due to its very intense IR signal (high absorption coefficient of the ν(CO) mode) and high sensitivity to the chemical state, the geometry, and the coordinative unsaturation degree of the adsorption site. Therefore, CO probing IR spectroscopy is atomically sensitive, and the type of metal, the number of metal atoms involved in the adsorption site (on-top, bridge, three- and 4-fold hollow), the oxidation states, the local geometric, and the electronic environments would cause the frequency shift of C–O vibration that can be recorded. ,,− Moreover, thanks to the superior infrared light response of most metal oxides, and together with the easy availability of the IR spectrometer in most laboratories compared with AC-STEM and XAS and the high sensitivity to low metal loading, ,, CO probe IR spectroscopy (CO-IR) is perhaps the most available technique in the development and/or the catalytic study of oxide supported SACs.…”

Section: Characterization Of Metal–metal Oxide Sacsmentioning

confidence: 99%

Single-Atom Catalysts Based on the Metal–Oxide Interaction

et al. 2020

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Metal atoms dispersed on the oxide supports constitute a large category of single-atom catalysts. In this review, oxide supported single-atom catalysts are discussed about their synthetic procedures, characterizations, and reaction mechanism in thermocatalysis, such as water–gas shift reaction, selective oxidation/hydrogenation, and coupling reactions. Some typical oxide materials, including ferric oxide, cerium oxide, titanium dioxide, aluminum oxide, and so on, are intentionally mentioned for the unique roles as supports in anchoring metal atoms and taking part in the catalytic reactions. The interactions between metal atoms and oxide supports are summarized to give a picture on how to stabilize the atomic metal centers, and rationally tune the geometric structures and electronic states of single atoms. Furthermore, several directions in fabricating single-atom catalysts with improved performance are proposed on the basis of state-of-the-art understanding in metal-oxide interactions.

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Section: Characterization Of Metal–metal Oxide Sacsmentioning

confidence: 99%

Single-Atom Catalysts Based on the Metal–Oxide Interaction

et al. 2020

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“…Polarization-modulation infrared reflection-absorption spectroscopy (PM-IRAS) has been extensively used to study well-defined model catalytic systems at elevated pressures and temperatures in conventional thermal catalysis . PM-IRAS is a reflectance-mode IR technique with high surface sensitivity that arises from the selective absorption of s - and p -polarized light by the surface and gas-phase species.…”

Section: Introductionmentioning

confidence: 99%

“…Polarization-modulation infrared reflection-absorption spectroscopy (PM-IRAS) has been extensively used to study welldefined model catalytic systems at elevated pressures and temperatures in conventional thermal catalysis. 34 PM-IRAS is a reflectance-mode IR technique with high surface sensitivity that arises from the selective absorption of s-and p-polarized light by the surface and gas-phase species. Using a photoelastic modulator (PEM), the polarization is modulated between ppolarized light, parallel to the plane of incidence, and spolarized light, perpendicular to the plane of incidence.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of Plasma-Stimulated Activation of Surface Species Using Multimodal In Situ/Operando Spectroscopy Combining Polarization-Modulation Infrared Reflection-Absorption Spectroscopy, Optical Emission Spectroscopy, and Mass Spectrometry

Lee

O’Brien

2021

ACS Appl. Mater. Interfaces

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Nonthermal plasmas (NTPs) produce reactive chemical environments, including electrons, ions, radicals, and vibrationally excited molecules, that can drive chemistry at temperatures at which such species are thermally inaccessible. There has been growing interest in the integration of conventional catalysis with reactive NTPs to promote novel chemical transformations. Unveiling the full potential of plasma-catalytic processes requires a comprehensive understanding of plasma-catalytic synergies, including characterization of plasma-catalytic surface interactions. In this work, we report on a newly designed multimodal spectroscopic instrument combining polarization-modulation infrared reflection-absorption spectroscopy (PM-IRAS), mass spectrometry, and optical emission spectroscopy (OES) for the investigation of plasma–surface interactions such as those found in plasma catalysis. In particular, this tool has been utilized to correlate plasma-phase chemistry with both surface chemistry and gas-phase products in situ (1) during the deposition of carbonaceous surface species via NTP-promoted nonoxidative coupling of methane and (2) during subsequent activation of surface deposits with an atmospheric pressure and temperature argon plasma jet on both nickel (Ni) and silicon dioxide (SiO2) surfaces. For the first time, the activation of carbonaceous surface species by a NTP on Ni and SiO2 surfaces to form hydrogen gas and C2 hydrocarbons was directly observed, where both PM-IRAS and OES measurements suggest that they may form through different pathways. This unique tool for studying plasma–surface interactions could enable more rational design of plasma-stimulated catalytic processes.

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“…Finally, reflection-absorption infrared spectroscopy (RAIRS) measures the difference in reflectivity of the surface with (R adsorbates ) and without (R 0 ) adsorbed molecules. [52,53] Studying adsorbed monolayer and submonolayer on metal surfaces by RAIRS allows accessing information about their molecular structure, their chemical identity and adsorption site.…”

Section: Experimental Realizationmentioning

confidence: 99%

Experimental and Computational Aspects of Electrochemical Reflection Anisotropy Spectroscopy: A Review

et al. 2023

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Electrode/electrolyte interfaces play a crucial role in many electrochemical energy conversion and storage technologies. Hence, a deep understanding of the interfacial structure, energetic alignment and processes is of high relevance and has triggered the development of a number of in situ and operando techniques. One approach for gaining information about the change in surface chemistry and structure on an atomic scale is reflection anisotropy spectroscopy (RAS). This review presents and discusses the continuing effort to develop RAS as an in situ optical probe for solid‐liquid interfaces under applied potentials. Experimental and computational basic principles are presented and key challenges of electrochemical RAS are highlighted. Furthermore, we exemplarily demonstrate the potential of the method for spectroelectrochemistry, focusing on indium phosphide‐ and gold‐aqueous electrolyte interfaces as exemplary case studies, and outline research directions for battery systems.

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In‐situInfrared Spectroscopy on Model Catalysts

Cited by 12 publications

References 70 publications

Single-Atom Catalysts Based on the Metal–Oxide Interaction

Single-Atom Catalysts Based on the Metal–Oxide Interaction

Direct Observation of Plasma-Stimulated Activation of Surface Species Using Multimodal In Situ/Operando Spectroscopy Combining Polarization-Modulation Infrared Reflection-Absorption Spectroscopy, Optical Emission Spectroscopy, and Mass Spectrometry

Experimental and Computational Aspects of Electrochemical Reflection Anisotropy Spectroscopy: A Review

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