In situ DRIFT study of nonoxidative methane reaction on Mo/SnO2 catalyst

Nasser, H.; Rédey, Ákos; Yuzhakova, Tatiana; Kovács, József

doi:10.1007/s11144-008-5299-1

Cited by 3 publications

(5 citation statements)

References 21 publications

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“…First, the additional activated oxygen species on the Au and LSMO surfaces accelerates the reaction such that either the CH 3 – species are oxidized to CH 2 O which then rapidly dissociates into HCOO– species or the CH 3 – species are oxidized directly into HCOO – species (explaining the lack of CH 2 O species observed in the DRIFTS spectra). It has been reported that the electrophilicity of adsorbed oxygen can enhance the dissociation of CH 3 – . , Under the elevated activated oxygen environment, the HCOO – species also tend to be oxidized to carbonates rather than associate into CO 2 . This corresponds to literature reports whereby, when the O 2 /CH 4 > 2, adsorbed HCOO – species are prone to convert to carbonates.…”

Section: Results and Discussionmentioning

confidence: 99%

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High Performance Au–Pd Supported on 3D Hybrid Strontium-Substituted Lanthanum Manganite Perovskite Catalyst for Methane Combustion

et al. 2016

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Bimetallic Au–Pd alloy nanoparticles (NPs) dispersed on nanohybrid three-dimensionally ordered macroporous (3DOM) La0.6Sr0.4MnO3 (LSMO) perovskite catalysts were fabricated via the l-lysine-mediated colloidal crystal-templating and reduction routes. The obtained AuPd/3DOM LSMO samples possess a nanovoid-like 3DOM construction with well-dispersed Au–Pd alloy NPs (2.05–2.35 nm in size) on the internal walls of the macropores. The Au–Pd alloy presence favored catalytic activity for methane combustion. The 3DOM LSMO support exhibits three key attributes: (i) a large surface area (32.0–33.8 m2/g) which aids high dispersion of the noble metal NPs on the support surface; (ii) abundant Brønsted acid sites which facilitate reactant adsorption and activation; and (iii) thermal stability. AuPd/3DOM LSMO has been synthesized with beneficial properties, including a richness of adsorbed oxygen species, increased oxidized noble metal species, low-temperature reducibility, and strong noble metal–3DOM LSMO interaction, all contributing to provide enhanced activity and a structure with high thermal and hydrothermal stability. In situ diffuse reflectance infrared Fourier transform spectroscopy studies revealed that including Au in the bimetallic system accelerated the reaction rate and altered the reaction pathway for methane oxidation by enriching the adsorbed oxygen species and decreasing the bonding strength between the reaction intermediates and the Pd atoms.

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Section: Results and Discussionmentioning

confidence: 99%

“…It has been reported that the electrophilicity of adsorbed oxygen can enhance the dissociation of CH 3 − . 53,54 Under the elevated activated oxygen environment, the HCOO − species also tend to be oxidized to carbonates rather than associate into CO 2 . This corresponds to literature 41…”

mentioning

confidence: 99%

High Performance Au–Pd Supported on 3D Hybrid Strontium-Substituted Lanthanum Manganite Perovskite Catalyst for Methane Combustion

et al. 2016

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“…were carried out in which were studied the influence of different factors on selectivity [15]. The nature of intermediate compounds in the catalytic process was detected by recording the DRIFT spectra of surface species formed upon contact of CH4 with Mo/SnO2.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain information about the mechanism of methane oxidation over a surface, experiments were carried out in which was studied the influence of different factors on selectivity. 15 The nature of intermediate compounds in the catalytic process was detected by recording the DRIFT spectra of surface species formed upon contact of CH 4 with Mo/SnO 2 . The spectra exhibit a discrete band at 1680 cm −1 together with a band at 1190 cm −1 (γ(H−CO)).…”

Section: ■ Introductionmentioning

confidence: 99%

Selective Oxidation of Methane to Formaldehyde Catalyzed by Phosphates: Kinetic Description by Bond Strengths and Specific Total Acidities

Gomonaj

Toulhoat

2018

ACS Catal.

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A kinetic model predicts the experimental activity and selectivity patterns obtained in oxidation of methane for divided unsupported orthophosphates (M II 3(PO4)2, M III PO4,) and pyrophosphates (M II 2P2O7, M IV P2O7) catalysts spanning extended ranges of M-O bond strength (calculated from first principles) and specific total acidity H 0. A volcano curve is obtained when total methane oxidation rates are plotted against M-O bond strength. M IV P2O7 Pyrophosphates are the most acidic catalysts (H 0 >10 µmol.m-2) and remarkably selective to formaldehyde (>90%). For this subset of catalysts, experimental oxidation rates deviate however from predictions in correlation with their acidity, suggesting a significant deactivation phenomenon. H 0 is shown to be described, and therefore predictable for these phosphates, by a structural parameter, the average P-Oa bond length, Oa being a bridging atom between M and P. Differences in acidity are interpreted as a consequence of the compression or elongation of the Oa-P bond inside the M-Oa-P bridges.

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“…[30][31][32][33][34] It is observed that the former increased and the latter gradually decreased during the annealing process. The observed DRIFT spectra indicate that the Sn-O-Sn component is produced due to the decomposition of the In(OH) 3 precursor during the thermal annealing.…”

Section: -32mentioning

confidence: 99%

Influence of Thermal Annealing on the Microstructural Properties of Indium Tin Oxide Nanoparticles

Kim¹,

Kim²,

Choi³

2012

Bulletin of the Korean Chemical Society

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In this work, we studied the microstructural changes of ITO during the annealing process. ITO nanoparticles were prepared by the sol-gel method using indium tin hydroxide as the precursor. The prepared sample was investigated using TEM, powder XRD, XPS, DRIFT, and 2D correlation analysis. The O 1s XPS spectra suggested that the microstructural changes during the annealing process are closely correlated with the oxygen sites of the ITO nanoparticles. The temperature-dependent in situ DRIFT spectra suggested that In-OH in the terminal sites is firstly decomposed and, then, Sn-O-Sn is produced in the ITO nanoparticles during the thermal annealing process. Based on the 2D correlation analysis, we deduced the following sequence of events: 1483 (due to In-OH bending mode) → 2268, 2164 (due to In-OH stretching mode) → 1546 (due to overtones of Sn-O-Sn modes) → 1412 (due to overtones of Sn-O-Sn modes) cm −1.

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In situ DRIFT study of nonoxidative methane reaction on Mo/SnO2 catalyst

Cited by 3 publications

References 21 publications

High Performance Au–Pd Supported on 3D Hybrid Strontium-Substituted Lanthanum Manganite Perovskite Catalyst for Methane Combustion

High Performance Au–Pd Supported on 3D Hybrid Strontium-Substituted Lanthanum Manganite Perovskite Catalyst for Methane Combustion

Selective Oxidation of Methane to Formaldehyde Catalyzed by Phosphates: Kinetic Description by Bond Strengths and Specific Total Acidities

Influence of Thermal Annealing on the Microstructural Properties of Indium Tin Oxide Nanoparticles

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