Pt and/or Pd Supported/Incorporated Catalyst on Perovskite-Type Oxide for Water Gas Shift Reaction

Watanabe, Ryo; Sekine, Yasushi; Takamatsu, H.; Sakamoto, Yuji; Aramaki, S.; Matsukata, Masahiko; Kikuchi, Eiichi

doi:10.1007/s11244-010-9496-6

Cited by 19 publications

(14 citation statements)

References 39 publications

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“…The density of surface oxygen vacancies is about 10-15 % for the two [10,47]. Similarly, we consider oxygen vacancies of nonstoichiometric MnO 1-x as sites for dissociating H 2 O.…”

Section: Resultsmentioning

confidence: 99%

Water–Gas Shift on Pd/α-MnO2 and Pt/α-MnO2

et al. 2015

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Low temperature water-gas shift (WGS) catalysts, Pd nanoparticles supported on a-MnO 2 nanorods termed Pd/a-MnO 2 and Pt nanoparticles supported on aMnO 2 nanorods termed Pt/a-MnO 2 were synthesized by introducing Pd or Pt precursor to well-prepared a-MnO 2 nanorods through precipitation deposition with a following annealing at 300°C. They are quite active for WGS in the temperature range of 140-350°C. Activation energies for WGS on Pd/a-MnO 2 and Pt/a-MnO 2 are 45.3 and 56.4 kJ/mol respectively, comparable to precious metal supported on CeO 2 and TiO 2 for WGS. Surface chemistries of the two catalysts during WGS were tracked with ambient pressure X-ray photoelectron spectroscopy. Different from the preservation of the surface and bulk phase of other oxide support such as CeO 2 , TiO 2 in CeO 2 -or TiO 2 -based WGS catalysts, both surface and bulk of aMnO 2 nanorods of Pd/a-MnO 2 and Pt/a-MnO 2 are transited to MnO during WGS. In-situ studies identified oxygen vacancies of the formed MnO support during WGS and the metallic state of Pd and Pt nanoparticles supported on the nonstoichiometric MnO. Graphical Abstract

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“…The density of surface oxygen vacancies is about 10-15 % for the two [10,47]. Similarly, we consider oxygen vacancies of nonstoichiometric MnO 1-x as sites for dissociating H 2 O.…”

Section: Resultsmentioning

confidence: 99%

Water–Gas Shift on Pd/α-MnO2 and Pt/α-MnO2

et al. 2015

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“…In our previous study, perovskite-type oxide (LaCoO 3 ) showed high activity for WGS reaction [7,18]. For that reason, LaCoO 3 was chosen as a perovskite oxide support in this study.…”

Section: Methodsmentioning

confidence: 99%

“…For that reason, LaCoO 3 was chosen as a perovskite oxide support in this study. The preparation method of LaCoO 3 was described elsewhere [7,18]. In the case of iron oxide, a commercial Fe 2 O 3 (Kanto Chemical Co. Inc.) and precipitated Fe 2 O 3 were used.…”

Section: Methodsmentioning

confidence: 99%

Effect of Loading Potassium and Palladium over Iron-Based Catalyst for Low Temperature Water–Gas Shift Reaction

et al. 2010

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We investigated the effect of loading potassium over iron-based catalysts for water-gas shift (WGS) reaction at 573 K. The iron-based water-gas shift catalyst has been known as a redox-mechanism catalyst. Therefore, to promote the redox reaction over iron oxide, we impregnated a small amount of Pd on various iron oxides. Results revealed that coexisting potassium and palladium accelerated the WGS reaction over iron-oxide catalyst. We examined the optimum amount of potassium over Pd/iron catalyst, and we found that the optimum molar ratio was about 2 (K/Pd molar ratio). From the viewpoint of reducibility of the catalyst, the addition of small amount of Pd onto iron oxide promotes reduction from Fe 2 O 3 to Fe 3 O 4 . However, impregnation of potassium on iron oxide makes the catalyst structure robust. The promotion effect of Pd and potassium was not observed on SiO 2 support. We therefore concluded that the synergetic effect among Pd, K, and iron oxide, was important for the WGS reaction.

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“…The loading of a precious metal promoted the ability of releasing the lattice oxygen, and such promotion resulted in an increased WGS performance [23,24]. In order to enhance the WGS activity of the structured catalyst, the LaCoO 3 catalyst supported Pd component was prepared and was its performance investigated.…”

Section: Wgs Performance Of Structured Lacoo 3 and Pd Supported Catalystmentioning

confidence: 99%

“…A preliminary study showed that the reduction temperature of the catalyst could influence the catalytic performance of the WGS reaction [23,24]. A precious metal supported on a perovskite-type oxide has the unique property; the reduction temperature of the perovskite-type oxide is significantly reduced by supporting novel metals such as platinum (Pt) and palladium (Pd).…”

Section: Introductionmentioning

confidence: 99%

Pd-supporting LaCoO3 catalyst with structured configuration for water gas shift reaction

Watanabe

Fujita

Tagawa

et al. 2014

Applied Catalysis A: General

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The purpose of this study was to develop a structured perovskite-type oxide catalyst for the water gas shift (WGS) reaction, which could make lattice oxygen mobile at a low external heat energy by preparing it as a thin catalyst layer on a metal plate. The thickness of the formed LaCoO 3 layer was about 20 µm, which was confirmed by FE-SEM and EDX analysis. For enhancing its WGS reaction performance, a palladium (Pd) component was supported on the structured catalyst using various Pd precursors.When using a PdCl 2 aqueous solution which was prepared by filtration of the PdCl 2 slurry (the filtration liquid), the Pd-supporting LaCoO 3 structured catalyst showed a high and stable activity. The reason for such an enhanced activity was that the supported Pd was in a highly dispersed state, which was derived from the electrostatic interaction between [PdCl 3 (H 2 O)]as the anionic charged precursor in the filtration liquid and the oppositely charged LaCoO 3 support surface confirmed by a UV-Vis measurement. In order to remove the remaining chloride ligand from the Pd-supporting LaCoO 3 catalyst surface, a washing treatment was performed by immersing the as-made catalyst in water, NH 3 (aq) or NaOH (aq) at pH 11.5 for 30 min. Consequently, these washing processes were effective for eliminating the remaining chloride ion from the catalyst surface and improving the shift activity of the catalyst. The catalyst washed using NH 3 (aq) showed the highest activity among these catalysts.

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Pt and/or Pd Supported/Incorporated Catalyst on Perovskite-Type Oxide for Water Gas Shift Reaction

Cited by 19 publications

References 39 publications

Water–Gas Shift on Pd/α-MnO2 and Pt/α-MnO2

Water–Gas Shift on Pd/α-MnO2 and Pt/α-MnO2

Effect of Loading Potassium and Palladium over Iron-Based Catalyst for Low Temperature Water–Gas Shift Reaction

Pd-supporting LaCoO3 catalyst with structured configuration for water gas shift reaction

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