Investigation of the behaviour of a Pd/γ-Al2O3 catalyst during methane combustion reaction using in situ DRIFT spectroscopy

Demoulin, Olivier; Navez, Michaël; Ruíz, Patricio

doi:10.1016/j.apcata.2005.08.008

Cited by 89 publications

(62 citation statements)

References 80 publications

(152 reference statements)

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“…No additional spectral features are noticed. When the pulse lasts 1 min, the same evolution of the CO 2 (g) contribution is observed (on a longer time scale) but, this time, carbonyl bridging species adsorbed on metallic palladium (Pd 0 x ÀCO), observed around 1900 cm À1 [12,14,36,37], weakly appear (F) but are rapidly removed (G).…”

Section: Characterization Resultsmentioning

confidence: 77%

“…2), the sample was heated up to 400 8C under standard reaction conditions and H 2 additions were performed for 1 s and 1 min, respectively. When the pulse lasts 1 s, the CO 2 (g) fingerprint, observed around 2300 cm À1 [12,14,[32][33][34][35], is severely decreased (B) but rapidly (after 2 min) recovers its initial intensity (C). No additional spectral features are noticed.…”

Section: Characterization Resultsmentioning

confidence: 98%

“…Previously, we have demonstrated, using in situ Raman spectroscopy studies, that on the Pd(2 wt.%)/gAl 2 O 3 catalysts, palladium is in a highly oxidized form, while the catalyst is under working conditions [13]. It is proposed that a layer of a very reactive oxygen species would develop on the surface of the palladium particles under working conditions, due to O 2 dissociative adsorption [12]. The formation of such layer produces over-stoichiometric surface palladium oxide and very active O * species which cover its surface.…”

Section: Surface Dynamic Processes During the Reactionmentioning

confidence: 98%

“…It is well known that the oxidation state of palladium is one of the key parameters governing the combustion process efficiency [9][10][11]. Recently, we have proposed a reaction scheme for CCM on Pd/g-alumina catalyst [12], mainly based on operando Raman [13] and operando DRIFTS [12,14] experiments. This model takes surface dynamic phenomena into account and suggests that surface O species covering the external surface of PdO are the most active species for the reaction [12].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we have proposed a reaction scheme for CCM on Pd/g-alumina catalyst [12], mainly based on operando Raman [13] and operando DRIFTS [12,14] experiments. This model takes surface dynamic phenomena into account and suggests that surface O species covering the external surface of PdO are the most active species for the reaction [12]. In that sense, from a fundamental point of view, adding H 2 to the feed could be a useful tool to shed some light on the state of the catalyst and on the stability of such surface oxygen layer during the reaction.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of the addition of H2 upon the behavior and properties of a Pd(2wt.%)/γ-Al2O3 catalyst and a comparison with the case of the Pt-based catalyst

Demoulin¹,

Seunier²,

Navez³

et al. 2006

Applied Catalysis A: General

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Section: Characterization Resultsmentioning

confidence: 77%

Section: Characterization Resultsmentioning

confidence: 98%

Section: Surface Dynamic Processes During the Reactionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of the addition of H2 upon the behavior and properties of a Pd(2wt.%)/γ-Al2O3 catalyst and a comparison with the case of the Pt-based catalyst

Demoulin¹,

Seunier²,

Navez³

et al. 2006

Applied Catalysis A: General

Self Cite

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Exploiting Synergies in Catalysis and Gas Sensing using Noble Metal‐Loaded Oxide Composites

et al. 2018

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Noble metal/metal oxide nanocomposites are very important in various fields of catalysis and play an evenly important role in gas sensing. Although there are many similarities regarding the choice of materials, the synthesis and the fundamental mechanisms, both research fields have been mostly treated independently up to now. In both fields, open questions regarding the elementary steps in the interaction of the gases with the active species and the role of the noble metal, the semiconducting metal oxide support and the interface remain. In this concept article, we first outline the importance of such composites in catalysis and gas sensing focussing on Pt/Pd, as well as CeO2 and SnO2 as transition metal oxides. Next, the state of art of both fundamental and relevant surface reactions and electronic mechanisms are described. Finally, we highlight the synergy of jointly exploring catalysis and gas sensing of noble metal/metal oxide nanocomposite materials and the benefit for both research fields if they are dealt with simultaneously using advanced characterization and operando methods, sophisticated preparation techniques, testing of the performance, and predictive theoretical modelling.

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Highly Active and Stable Palladium Catalysts Supported on Surface‐modified Ceria Nanowires for Lean Methane Combustion

Ogunbiyi

et al. 2020

ChemCatChem

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An efficient strategy was presented to synthesize highly active palladium catalyst supported on ceria nanowires modified by organosilanes (abbreviated as Pd/CeO2NWs@SiO2) for lean methane combustion. It is found that such a surface‐modified strategy can significantly improve the dispersion of surface palladium species and strengthen the concentration of active surface‐adsorbed oxygen species via reconstructing the surface microenvironment, invoking an efficient performance for methane oxidation. Under the space velocity of 60,000 mLg−1h−1, 0.5 wt% Pd/CeO2NWs@SiO2 displayed extraordinary catalytic activity with 90 % conversion rate at a temperature of around 327 °C, far lower than that of pristine Pd/CeO2NWs (378 °C) under the same conditions. What's more, unexpected stability was observed under high temperature and the presence of water vapor conditions owing to the intense metal support interaction of Pd/CeO2NWs@SiO2 catalyst. The possible reaction mechanism of lean methane oxidation was probed by in situ DRIFT spectra. It is observed that the pivotal intermediate products (carbonate and carbon oxygenates) generated on Pd/CeO2NWs@SiO2 surface are more readily decomposed into CO2. Importantly, the silicon hydroxyl groups (Si−OH) formed during the reaction can efficiently restrict the generation of the stable Pd(OH)x phase and release more active sites to facilitate the catalytic performance. This study provides a convenient method to design the highly reactive and durable palladium‐based catalyst for methane combustion.

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Investigation of the behaviour of a Pd/γ-Al2O3 catalyst during methane combustion reaction using in situ DRIFT spectroscopy

Cited by 89 publications

References 80 publications

Influence of the addition of H2 upon the behavior and properties of a Pd(2wt.%)/γ-Al2O3 catalyst and a comparison with the case of the Pt-based catalyst

Influence of the addition of H2 upon the behavior and properties of a Pd(2wt.%)/γ-Al2O3 catalyst and a comparison with the case of the Pt-based catalyst

Exploiting Synergies in Catalysis and Gas Sensing using Noble Metal‐Loaded Oxide Composites

Highly Active and Stable Palladium Catalysts Supported on Surface‐modified Ceria Nanowires for Lean Methane Combustion

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