Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeOx/Pt/Al2O3 during CO oxidation

Gibson, Emma K.; Crabb, Eleanor M.; Gianolio, Diego; Russell, Andrea E.; Thompsett, David; Wells, Peter P.

doi:10.1080/2055074x.2017.1278890

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…The absorption bands at 2077, 2083 and 2085 cm −1 for 0.25%, 0.1% and 0.025% Pt/CZ catalysts, respectively, probably refer to the linear adsorption of CO on Pt 0 centers. Typically, the position of the Pt 0 –CO band is noted in the range 2050–2090 cm −1 ; 28,29 the shift of this band may indicate a small size of the Pt particles or even the presence of a metal in a cluster form 29–31 . It can also be a result of electronic interaction between platinum and a Ce‐containing support 28,32 .…”

Section: Resultsmentioning

confidence: 99%

Heterogeneous additive‐free highly selective synthesis of 2,5‐bis(hydroxymethyl)furan over catalysts with ultra‐low Pt content

Виканова

Chernova

Редина

et al. 2021

J of Chemical Tech & Biotech

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Ultra‐low‐loaded supported Pt catalysts showed an extremely high activity in selective hydrogenation of bioavailable 5‐hydroxymethylfurfural (5‐HMF) to the corresponding diol, i.e. 2,5‐bis(hydroxymethyl)furan (BHMF); among the synthesized catalysts with a Pt content varying in the range 0.025–0.25 wt%, the most active one appeared to be the sample 0.1% Pt/CeO2–ZrO2, which allows us to obtain BHMF with a 97% yield and 100% selectivity from 5‐HMF without the use of alkali or any other additives at a temperature of 170 °C and H2 pressure of 1 MPa, with the 5‐HMF:Pt ratio higher than 1000 mol mol–1. © 2021 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

Heterogeneous additive‐free highly selective synthesis of 2,5‐bis(hydroxymethyl)furan over catalysts with ultra‐low Pt content

Виканова

Chernova

Редина

et al. 2021

J of Chemical Tech & Biotech

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“…Furthermore, the exploration of structural characterizations at the bulk and surfaces of catalysts is difficult to perform using only a single technique. With the continuous efforts made by researchers, the XAFS technique can be combined with other measurement results to present full-scale details, such as XAFS-XRD, − XAFS/DRIFTS/MS (DRIFT, diffuse reflectance infrared Fourier transform spectroscopy; MS, mass spectrometry) − and the SAXS/XRD/XAFS combined technique . As shown in Figure , the signals of synchrotron radiation-based combined techniques can be obtained simultaneously.…”

Section: Discussionmentioning

confidence: 99%

Applications of X-ray Absorption Fine Structure Spectroscopy in the Photocatalytic Conversion of Small Molecules

et al. 2023

ACS Catal.

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The conversion of small molecules (H2, CO, CH4, NH3, etc.) in energy-related systems offers enormous potential in the conversion and storage of renewable energy. X-ray absorption fine structure spectroscopy (XAFS) is indispensable in probing the geometric and electronic microenvironments of catalysts, providing the necessary assistance to reveal reaction mechanisms and active sites at the atomic level. Our summary highlights the recent advancements in utilizing XAFS in the photocatalytic conversion of small molecules, including but not limited to water splitting of H2 production, CO2 reduction, and N2 fixation. Furthermore, we discuss future prospects for the development of XAFS-based combined techniques to guide their utilization.

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H₂[Pt(C₂O₄)₂] as a Tailor‐made Halide‐free Precursor for the Preparation of Diesel Oxidation Catalysts: Nanoparticles Formation, Thermal Stability and Catalytic Performance

Spolaore,

Hengst,

Dornhaus

et al. 2023

ChemCatChem

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The aim of this study was to investigate a tailor‐made metal precursor and its chemical properties to tune the properties of supported metal nanoparticles (NPs) and their catalytic performance when used as Diesel Oxidation Catalyst (DOC). The formation of extremely small Pt NPs from a new halide‐free Pt complex was investigated, namely bis(oxalato)platinate, H2[Pt(C2O4)2]. The size evolution of the supported NPs, from the formation upon the Pt precursor decomposition on γ‐alumina to the sintering of the NPs at high temperatures, was followed by thermogravimetric analysis coupled with mass spectrometry (TG‐MS) and differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. A correlation between the NPs’ size of the catalyst and the performance for the CO, C3H6, C3H8 and NO oxidation reactions pointed out a retained activity during test cycles, showing low sensitivity to the test conditions applied (i. e., temperature and gas composition). The overall catalytic performance was better in the fresh catalysts compared to the reference catalyst prepared from platinum nitrate, Pt(NO3)4. In particular, the different dispersion of the Pt NPs over the support obtained from the two precursors was identified as the reason for the different catalytic performance, retaining small NPs size after the tests cycles.

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Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeO_x/Pt/Al₂O₃ during CO oxidation

Cited by 9 publications

References 25 publications

Heterogeneous additive‐free highly selective synthesis of 2,5‐bis(hydroxymethyl)furan over catalysts with ultra‐low Pt content

Heterogeneous additive‐free highly selective synthesis of 2,5‐bis(hydroxymethyl)furan over catalysts with ultra‐low Pt content

Applications of X-ray Absorption Fine Structure Spectroscopy in the Photocatalytic Conversion of Small Molecules

H₂[Pt(C₂O₄)₂] as a Tailor‐made Halide‐free Precursor for the Preparation of Diesel Oxidation Catalysts: Nanoparticles Formation, Thermal Stability and Catalytic Performance

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Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeOx/Pt/Al2O3 during CO oxidation

Cited by 9 publications

References 25 publications

Heterogeneous additive‐free highly selective synthesis of 2,5‐bis(hydroxymethyl)furan over catalysts with ultra‐low Pt content

Heterogeneous additive‐free highly selective synthesis of 2,5‐bis(hydroxymethyl)furan over catalysts with ultra‐low Pt content

Applications of X-ray Absorption Fine Structure Spectroscopy in the Photocatalytic Conversion of Small Molecules

H2[Pt(C2O4)2] as a Tailor‐made Halide‐free Precursor for the Preparation of Diesel Oxidation Catalysts: Nanoparticles Formation, Thermal Stability and Catalytic Performance

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Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeO_x/Pt/Al₂O₃ during CO oxidation

H₂[Pt(C₂O₄)₂] as a Tailor‐made Halide‐free Precursor for the Preparation of Diesel Oxidation Catalysts: Nanoparticles Formation, Thermal Stability and Catalytic Performance