Activity controlling factors for low-temperature oxidation of CO over supported Pd catalysts

Satsuma, Atsushi; Osaki, Kaoru; Yanagihara, Masatoshi; Ohyama, Junya; Shimizu, Ken‐ichi

doi:10.1016/j.apcatb.2012.12.025

Cited by 109 publications

(95 citation statements)

References 64 publications

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“…19 For example, Satsuma et al reported that Pd-loaded CeO 2 showed the largest CO oxidation activity at low temperature among various Pd-loaded metal oxides, by temperature-programmed reduction conducted by using CO. Namely, they showed that CO was easily oxidized to CO 2 even at RT and the first reduction peak was observed at 106°C, which verified the oxygen supply for CO oxidation at low temperature. 20 These results support that the addition of CeO 2 into the Pt electrode can enhance the electrochemical CO oxidation, and thus the potential of the Pt(15CeO 2 ) SE is also considered to be determined on the basis of mixed-potential theory. Presently, we believe that the electrode potential of both the SE and the CE was determined by the following electrochemical reactions, and the addition of CeO 2 into the Pt electrode largely reduced the overpotential of the electrochemical CO oxidation, which resulted in quite low electrode potential of the Pt(15CeO 2 ) SE in CO balanced with air (namely, largely negative CO response) of the Pt(15CeO 2 )/Pt sensor.…”

Section: ¹1supporting

confidence: 57%

Enhanced CO Response of NASICON-based Gas Sensors Using Oxide-added Pt Sensing Electrode at Low Temperature Operation

et al. 2017

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NASICON (Na 3 Zr 2 Si 2 PO 12 )-based solid electrolyte-type sensors equipped with various metal oxides (MO)-added Pt sensing electrode (SE, Pt(nMO) (n: MO additive amount in wt%) and Pt counter electrode (CE, Pt) on the same side of the NASICON disc were fabricated and their (Pt(nMO)/Pt sensors) CO-sensing properties were examined at 25-300°C. The Pt(15Bi 2 O 3 )/Pt sensor showed the largest CO response with a change in electromotive force to a positive direction (positive response) at 25°C, while the Pt(15CeO 2 )/Pt sensor showed the largest negative CO response at 25°C. The CO response of the Pt(15CeO 2 )/Pt sensor seems to be determined by mixed potential at the triple phase boundaries (TPBs) containing the electrochemical reactions of CO oxidation and oxygen reduction. X-ray photoelectron spectroscopy of the Pt(15Bi 2 O 3 ) SE before and after exposure to CO indicated a slight reduction of Bi 3+ after the exposure to CO. Therefore, the additional electrochemical reactions containing the reduction of Bi 2 O 3 were anticipated to occur at the TPBs of the Pt(15Bi 2 O 3 ) SE, which resulted in the large positive CO response of the Pt(15Bi 2 O 3 )/Pt sensor. Furthermore, the addition of 15 wt% CeO 2 to Pt CE of the Pt(15Bi 2 O 3 )/Pt sensor largely enhanced the magnitude of CO response and attained relatively excellent CO selectivity against H 2 .

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Section: ¹1supporting

confidence: 57%

Enhanced CO Response of NASICON-based Gas Sensors Using Oxide-added Pt Sensing Electrode at Low Temperature Operation

et al. 2017

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“…To date, this reaction was mostly studied on supported noble metal catalysts like Au, Pt and Pd due to their high activities at low temperatures [4][5][6]. However, high prices and deactivation drawbacks of these metal catalysts limit applications in many fields [5,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Palladium Supported on Ferric Oxide Nano-catalysts for Carbon Monoxide Oxidation in Low Temperature

Wang

Zhao

et al. 2014

Nano-Micro Lett.

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Catalytic property of Pd/Fe2O3 catalysts on carbon monoxide (CO) oxidation at low temperature were investigated in this paper. Both the as-prepared and H2-pretreated Pd/Fe2O3 catalysts show catalytic performances on CO oxidation. The CO was completely converted at 333 K for the as-prepared sample, whereas at 313 K for H2-pretreated Pd/Fe2O3-573 catalyst. The catalytic performance of the Pd/Fe2O3 catalyst decreases with increased calcination temperature. This may be due to the increased crystallinity of the support and decreased metal-support interaction. Progressive deactivation of the catalysts during long-time reaction was associated with the formation of carbonates on the catalyst surface that inhibits CO activation or intermediate transformation.

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“…It has been studied extensively using Pd as catalyst. The activity in CO oxidation on Pd on different supports is known to be influenced by the reducibility of the support [18]. The studies range from probing single crystal surfaces as well as supported catalysts.…”

Section: Introductionmentioning

confidence: 99%

Strong metal–support interactions between palladium and iron oxide and their effect on CO oxidation

d’Alnoncourt

Friedrich

Kunkes

et al. 2014

Journal of Catalysis

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Pd/FeO x catalysts were prepared by co-precipitation and characterized before and after reduction using X-ray powder diffraction, thermal analysis, CO chemisorption, electron microscopy, and X-ray photoelectron spectroscopy. Results give evidence for the encapsulation of palladium particles by iron oxide after reduction at high temperatures (523 K). Oxidation of carbon monoxide was applied as test reaction to characterize catalyst samples in different states. Strong metal-support interactions significantly enhance catalytic activity for oxidation of carbon monoxide. However, this state is not stable under the applied reaction conditions. Catalyst deactivation occurs in two ways: 1. via changes in the oxidation state of iron species and 2. due to sintering of palladium particles.

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Activity controlling factors for low-temperature oxidation of CO over supported Pd catalysts

Cited by 109 publications

References 64 publications

Enhanced CO Response of NASICON-based Gas Sensors Using Oxide-added Pt Sensing Electrode at Low Temperature Operation

Enhanced CO Response of NASICON-based Gas Sensors Using Oxide-added Pt Sensing Electrode at Low Temperature Operation

Preparation of Palladium Supported on Ferric Oxide Nano-catalysts for Carbon Monoxide Oxidation in Low Temperature

Strong metal–support interactions between palladium and iron oxide and their effect on CO oxidation

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