Solid Electrolyte Potentiometric Study of La(Sr)Mno3 Catalyst During Carbon-Monoxide Oxidation

Petrolekas, P. D.; Metcalfe, Ian S.

doi:10.1006/jcat.1995.1069

Cited by 36 publications

(27 citation statements)

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“…The authors observed a parallel between onset temperatures for CO conversion and temperature of reoxidation after TPR, leading them to conclude on the important role of oxygen‐deficient sites in CO oxidation. This result fits well with an ionic redox mechanism,341, 342 with reduction and reoxidation occurring on different sites while oxygen diffuses through the perovskite lattice to the CO reaction sites, and where reoxidation is the rate‐limiting step of the reaction.…”

Section: Co Oxidation Over Mixed Oxide Catalystssupporting

confidence: 81%

“…CO oxidation using labeled 18 O 2 molecules also confirmed that oxygen from the perovskite surface and subsurface can participate to the oxidation over (La,Ce)MnO 3 perovskites, which is in fact close to an intrafacial mechanism 333. Such redox mechanism was also clearly identified by Petrolekas and Metcalfe341, 342 for the CO oxidation at high temperature (>500 °C) over La 0.5 Sr 0.5 MnO 3 . These authors also distinguished a mechanism in which the reoxidation of the reduced surface sites is done through the diffusion of oxygen from the lattice (the “ionic” redox model).…”

Section: Co Oxidation Over Mixed Oxide Catalystssupporting

confidence: 60%

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Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides

2010

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International audienceOxidation into CO2 is a major solution to CO abatement in air depollution treatments. The development of catalytic converters led to an extraordinary high number of publications on metal catalysts during the last fifty years. Due to the increasing price of noble metals and to remarkable progresses in oxide syntheses, catalytic oxidation of carbon monoxide over oxide catalysts has recently gained in interest, even if some oxides are known to present remarkable activity since the beginning of the 20th century. In this Review, the kinetics and mechanism of CO oxidation on single and mixed oxides are examined, alongside the catalyst structure

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Section: Co Oxidation Over Mixed Oxide Catalystssupporting

confidence: 81%

Section: Co Oxidation Over Mixed Oxide Catalystssupporting

confidence: 60%

Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides

2010

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“…) via CO– 16 O (or C– 16 O– 16 O) combination, where 16 O is lattice oxygen (step i). This is consistent with a so‐called Mars—van Krevelen mechanism, as previously observed for other perovskites …”

Section: Resultssupporting

confidence: 92%

Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO₃(100) and BaTiO₃/SrTiO₃(100) ferroelectric surfaces

Nassreddine

Morfin

Niu

et al. 2014

Surface & Interface Analysis

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The use of ferroelectric materials as adsorbents or catalysts could be a promising way to control surface chemical reactions by tuning the ferroelectric polarization. In this context, the oxidation of carbon monoxide over well‐defined SrTiO3(100) and BaTiO3/SrTiO3(100) perovskite surfaces was investigated under stoichiometric gas‐phase conditions at a total pressure of 3 Torr, in the 100–300 °C temperature range. To this aim, an ultrahigh vacuum‐compatible reactor equipped with external laser heating, and specially designed to detect small yields of gaseous products by mass spectrometry, was used. Prior to the catalytic tests, with the help of Auger electron spectroscopy, a sample cleaning procedure under low oxygen pressure was established in order to remove carbon impurities. The as‐prepared surfaces appear poorly active in CO oxidation, but their activity increases if a high‐temperature pre‐annealing treatment under ultrahigh vacuum is applied in order to produce oxygen vacancies, which act as adsorption and/or reaction sites. The activity of the bare SrTiO3 substrates, whether doped with Nb or not, is similar to that of the supported BaTiO3 films, but the latter lose less activity upon evacuation/reaction cycles. Isotopic labeling experiments using 18O2 show that the reaction involves CO (and O2) dissociation, and that lattice oxygen participates to the reaction via the so‐called Mars–van Krevelen mechanism. Copyright © 2014 John Wiley & Sons, Ltd.

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“…As a result, the specific surface area became important, thus LaMnO 3 showed high catalytic activity. When the reaction temperature is increased, the lattice oxygen diffusion is activated, thus the vacancy is replenished also by lattice oxygen diffusion besides its re-oxidation by gas-phase O 2 , which greatly promoted the NH 3 oxidation rate since the re-oxidation of the vacancy was considered as the rate-limiting step [12,21]. In fact, TPR profile in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…These vacancies are then replenished by dissociative adsorption of gas-phase O 2 or by diffusion of bulk lattice oxygen [19,20]. Moreover, in the case of CO oxidation over La(Sr)MnO 3 and LaMn X V 1-X O 4-d , the oxygen diffusion through the oxide lattice played an important role, and the re-oxidation of the vacancy was considered as the rate-limiting step [12,21]. In the present study, it seems that the oxidation of NH 3 over LaMnO 3 and LaVO 4 also followed the Mars-van Krevelen type scheme, since the reaction temperature is rather high, the effects of surface adsorbed oxygen can be negligible [12], and only lattice oxygen is considered in this study.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Oxidation of Ammonia to NO over Perovskite-type LaMnO3 and LaVO4 Catalysts

et al. 2011

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Catalytic oxidation of NH 3 to NO ? NO 2 (NO X ) over perovskite-type LaMnO 3 and LaVO 4 prepared by sol-gel was studied. X-ray diffractometry and scanning electron microscopy analyses confirmed that the prepared LaMnO 3 and LaVO 4 had perovskite-type porous structure, and a specific surface area of 33.58 m 2 /g and 1.2 m 2 /g for LaMnO 3 and LaVO 4 was measured by BET, respectively. The catalytic oxidation of ammonia to NO X was found to begin at 350°C, and approximately 88 and 95% of NH 3 was oxidized to NO X at 600°C over LaMnO 3 and LaVO 4 , respectively.

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Solid Electrolyte Potentiometric Study of La(Sr)Mno3 Catalyst During Carbon-Monoxide Oxidation

Cited by 36 publications

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Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides

Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides

Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO₃(100) and BaTiO₃/SrTiO₃(100) ferroelectric surfaces

Catalytic Oxidation of Ammonia to NO over Perovskite-type LaMnO3 and LaVO4 Catalysts

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Solid Electrolyte Potentiometric Study of La(Sr)Mno3 Catalyst During Carbon-Monoxide Oxidation

Cited by 36 publications

References 0 publications

Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides

Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides

Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO3(100) and BaTiO3/SrTiO3(100) ferroelectric surfaces

Catalytic Oxidation of Ammonia to NO over Perovskite-type LaMnO3 and LaVO4 Catalysts

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Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO₃(100) and BaTiO₃/SrTiO₃(100) ferroelectric surfaces