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Kalinkin, A. V.; Pashis, A. V.; Bukhtiyarov, Valerii I.

doi:10.1023/a:1022522118315

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…The observation that pure Rh nanoparticles are more reactive than Pt nanoparticles is consistent with the earlier CO oxidation studies on thin films 50 and single crystals 30,51 .…”

Section: Composition Dependence Of Catalytic Reaction Rates Of Bimetasupporting

confidence: 90%

Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure

2008

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Model systems for studying molecular surface chemistry have evolved from single crystal surfaces at low pressure to colloidal nanoparticles at high pressure. Low pressure surface structure studies of platinum single crystals using molecular beam surface scattering and low energy electron diffraction techniques probe the unique activity of defects, steps and kinks at the surface for dissociation reactions (H-H, C-H, C-C, O=O bonds). High-pressure investigations of platinum single crystals using sum frequency generation vibrational spectroscopy have revealed the presence and the nature of reaction intermediates. High pressure scanning tunneling microscopy of platinum single crystal surfaces showed adsorbate mobility during a catalytic reaction. Nanoparticle systems are used to determine the role of metal-oxide interfaces, site blocking and the role of surface structures in reactive surface chemistry. The size, shape and composition of nanoparticles play important roles in determining reaction activity and selectivity.

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“…The observation that pure Rh nanoparticles are more reactive than Pt nanoparticles is consistent with the earlier CO oxidation studies on thin films 50 and single crystals 30,51 .…”

Section: Composition Dependence Of Catalytic Reaction Rates Of Bimetasupporting

confidence: 90%

Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure

2008

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“…In order to better understand how to control the exsolution process, we study the effect of substitution level, reduction time and temperature on the extent of exsolution and the particle size and population. We apply the prepared nanostructures for the CO oxidation reaction 16,17 , correlating the above-mentioned particle parameters to catalytic reactivity, and demonstrate that in spite of limited exsolution, they still compete well with samples prepared through deposition process that have a higher apparent metal surface loading.…”

Section: Introductionmentioning

confidence: 95%

Towards efficient use of noble metals via exsolution exemplified for CO oxidation

et al. 2019

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“…18 Our observation that pure Rh nanoparticles are more reactive than Pt nanoparticles is consistent with the CO oxidation results of Kalinkin et al on Rh, Pt, and Rh-Pt alloy thin films at low pressure (<P < 2 × 10 -5 mbar). 19,20 It was found that the activity of the alloy is intermediate between the activities of the individual metals, while a Rh thin film shows much higher activity than a Pt thin film. 20 We can also compare the activity of single-crystal Rh(111) with that of Pt(111).…”

mentioning

confidence: 99%

“…19,20 It was found that the activity of the alloy is intermediate between the activities of the individual metals, while a Rh thin film shows much higher activity than a Pt thin film. 20 We can also compare the activity of single-crystal Rh(111) with that of Pt(111). Peden et al studied CO oxidation on Rh(111) and Rh(100).…”

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confidence: 99%

Tuning of Catalytic CO Oxidation by Changing Composition of Rh−Pt Bimetallic Nanoparticles

et al. 2008

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Recent breakthroughs in synthesis in nanoscience have achieved control of size and composition of nanoparticles that are relevant for catalyst design. Here, we show that the catalytic activity of CO oxidation by Rh/Pt bimetallic nanoparticles can be changed by varying the composition at a constant size (9+/-1 nm). Two-dimensional Rh/Pt bimetallic nanoparticle arrays were formed on a silicon surface via the Langmuir-Blodgett technique. Composition analysis with X-ray photoelectron spectroscopy agrees with the reaction stoichiometry of Rh/(Pt+Rh). CO oxidation rates that exhibit a 20-fold increase from pure Pt to pure Rh show a nonlinear increase with surface composition of the bimetallic nanoparticles that is consistent with the surface segregation of Pt. The results demonstrate the possibility of controlling catalytic activity in metal nanoparticle-oxide systems via tuning the composition of nanoparticles with potential applications for nanoscale design of industrial catalysts.

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Cited by 8 publications

References 12 publications

Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure

Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure

Towards efficient use of noble metals via exsolution exemplified for CO oxidation

Tuning of Catalytic CO Oxidation by Changing Composition of Rh−Pt Bimetallic Nanoparticles

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