Formation of PtRu alloy nanoparticle catalyst by radiolytic process assisted by addition of dl-tartaric acid and its enhanced methanol oxidation activity

Kageyama, Satoru; Seino, Satoshi; Nakagawa, Takashi; Nitani, Hiroaki; Ueno, K.; Yamamoto, Takao A.

doi:10.1007/s11051-011-0513-x

Cited by 25 publications

(10 citation statements)

References 29 publications

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“…The peaks near 11567 eV in the XANES spectra, namely white lines, are mainly the result of electron transition from 2p 2/3 -band to 5d-band in the X-ray absorption process [30,31]. The peak intensity of the white lines is proportional to the 5d-band vacancy.…”

Section: Redox Properties Of Supported Ptmentioning

confidence: 98%

Coating SiO2 Support with TiO2 or ZrO2 and Effects on Structure and CO Oxidation Performance of Pt Catalysts

et al. 2013

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Abstract:In this work, we studied how TiO 2 and ZrO 2 coatings enhance the CO oxidation performance of SiO 2 -supported Pt catalysts under conditions relevant to automotive emissions control. SiO 2 was coated with metal oxides TiO 2 or ZrO 2 by sol-gel method and the subsequent Pt loading was done by incipient wetness method. The prepared catalysts Pt/TiO 2 -SiO 2 and Pt/ZrO 2 -SiO 2 were compared with Pt/SiO 2 and Pt/Al 2 O 3 in fresh, sulfated, and hydrothermally aged states. The structure of the catalysts was characterized with BET, XRD, TEM, EDS, EXAFS, XANES, TPD and TPR to help interpret the CO oxidation performance. Higher dispersion, stability, and oxidation state of Pt were achieved on TiO 2 -SiO 2 and ZrO 2 -SiO 2 supports due to stronger metal-support interaction leading to superior CO oxidation performance compared to Pt/SiO 2 and Pt/Al 2 O 3 . TiO 2 and ZrO 2 coatings introduced surface acidity but negligible basicity, which is a likely reason for the weak and low adsorption of SO 2 . The results suggest that the sol-gel coating of SiO 2 with metal oxides could be an attractive strategy for designing automotive oxidation catalysts with enhanced performance such as low-temperature activity, sulfur tolerance, and hydrothermal stability.

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Section: Redox Properties Of Supported Ptmentioning

confidence: 98%

Coating SiO2 Support with TiO2 or ZrO2 and Effects on Structure and CO Oxidation Performance of Pt Catalysts

et al. 2013

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“…b Pt1Cu9/C and Cu9/C samples prepared with various reduction enhancers promote their alloying (Daimon et al 2008;Kageyama et al 2011). It also has a function of a stabilizer for nanoparticles (Xu et al 2006).…”

Section: Effect Of Reduction Enhancersmentioning

confidence: 99%

Effect of reduction enhancer on a radiolytic synthesis of carbon-supported Pt–Cu nanoparticles and their structural and electrochemical properties

et al. 2015

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In order to clarify the effect of reduction enhancer on the nanoparticle formation process and their structural and catalytic properties, carbon-supported Pt-Cu nanoparticles were synthesized by electron beam irradiation on an aqueous precursor solution in the presence/absence of reduction enhancer. In the absence of reduction enhancer, tetravalent platinum oxide particles of approximately 1 nm in diameter were formed on carbon support with copper barely precipitated, while in the presence of 2-propanol or ethylene glycol or glucose both platinum and copper precipitated as few-nanometer-sized alloy particles together with copper oxides. It was suggested that the metal nuclei produced upon electron beam irradiation do not have enough lifetime without reduction enhancer due to fast oxidation of the nuclei by oxidizing radicals, while the reduction enhancer scavenges these oxidizing radicals preventing oxidation of metallic clusters and prolonging their lifetime. Ethylene glycol gave smaller and better alloyed particles with less copper oxides compared to 2-propanol since the carbonyl compounds derived from oxidation of ethylene glycol protect metallic clusters from oxidation further prolonging their lifetime. In the electrochemical measurements, the methanol oxidation activities of Pt-Cu/C catalysts were well explained by their structural characteristics.

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“…The EOR activity was evaluated by LSV technique with three electrode type beaker cell. The experimental setup for electrochemical measurement is described elsewhere [3]. Potential-current curves were obtained with an electrochemical analyzer (ALS630B, ALS) by varying the potential from 0.1 to 0.7 V versus NHE at a sweep rate of 5 mV/sec.…”

Section: Methodsmentioning

confidence: 99%

“…The structures of the nanoparticle catalysts were controllable by the synthesis parameters. We have already succeeded in synthesizing PtRu/C [3] and PtRuAu/C [4] for DMFC anode catalysts and PtCu/CuO/Fe 2 O 3 [5] as PROX catalysts, which showed high catalytic activities depending on their inner structure. In this study, we successfully synthesized PtSnO 2 /C with different Sn/Pt ratio using electron beam irradiation method.…”

Section: Introductionmentioning

confidence: 99%

Structure control of Pt-SnO₂catalyst for DEFC synthesized by electron beam irradiation method

et al. 2014

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Carbon supported Pt-SnO 2 electrocatalysts with different Sn/Pt molar ratios were prepared by an electron beam irradiation method. Dissolved gas conditions in the vials irradiated with electron beam were controlled to air or Ar. The results of the material analyses showed that both Pt and SnO 2 were immobilized onto carbon support in all catalysts. Bubbling Ar to the precursor solution led to steady change of metal contents in response to the precursor concentrations. The ethanol oxidation activity plotted against Sn/Pt ratio behaved differently with dissolved gas condition of the vial. This difference is discussed with supposed existing state of SnO 2 in connection with the reduction process of Pt and Sn.

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Formation of PtRu alloy nanoparticle catalyst by radiolytic process assisted by addition of dl-tartaric acid and its enhanced methanol oxidation activity

Cited by 25 publications

References 29 publications

Coating SiO2 Support with TiO2 or ZrO2 and Effects on Structure and CO Oxidation Performance of Pt Catalysts

Coating SiO2 Support with TiO2 or ZrO2 and Effects on Structure and CO Oxidation Performance of Pt Catalysts

Effect of reduction enhancer on a radiolytic synthesis of carbon-supported Pt–Cu nanoparticles and their structural and electrochemical properties

Structure control of Pt-SnO₂catalyst for DEFC synthesized by electron beam irradiation method

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Formation of PtRu alloy nanoparticle catalyst by radiolytic process assisted by addition of dl-tartaric acid and its enhanced methanol oxidation activity

Cited by 25 publications

References 29 publications

Coating SiO2 Support with TiO2 or ZrO2 and Effects on Structure and CO Oxidation Performance of Pt Catalysts

Coating SiO2 Support with TiO2 or ZrO2 and Effects on Structure and CO Oxidation Performance of Pt Catalysts

Effect of reduction enhancer on a radiolytic synthesis of carbon-supported Pt–Cu nanoparticles and their structural and electrochemical properties

Structure control of Pt-SnO2catalyst for DEFC synthesized by electron beam irradiation method

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Structure control of Pt-SnO₂catalyst for DEFC synthesized by electron beam irradiation method