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

Park, Jeong Young; Zhang, Yawen; Graß, Michael; Zhang, Tianfu; Somorjai, Gábor A.

doi:10.1021/nl073195i

Cited by 208 publications

(167 citation statements)

References 29 publications

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“…6(a)). On the third pass through the reactor containing Pt@TiO 2 , CO conversion reached 100% at 333 K. It is well known that Pt-loaded metal oxide supported catalysts are generally not efficient at low ratios of O 2 /CO or temperatures below 443 K, because CO and O 2 are adsorbed at similar sites, and strong CO adsorption hinders O 2 adsorption on the noble metal catalyst [40][41][42]. In our case, the high conversion obtained at low temperature indicates the high activity of the small nanoparticles with a large number of Pt atoms with low coordination number present on the surface of nanoparticles with a diameter of 1 nm [19,20,43].…”

Section: Catalytic Performance Of Pt@tio 2 and Pd@tio 2 In The Co Oximentioning

confidence: 99%

Large scale photochemical synthesis of M@TiO2 nanocomposites (M = Ag, Pd, Au, Pt) and their optical properties, CO oxidation performance, and antibacterial effect

et al. 2010

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Well-dispersed M@TiO 2 (M = Ag, Pd, Au, Pt) nanocomposite particles with a diameter of 200-400 nm can be synthesized on a large scale by a clean photochemical route which does not require any additives using spherical rutile nanoparticles as a support. The sizes of Pt, Au, and Pd nanoparticles formed on the surface of TiO 2 particles are about 1 nm, 5 nm, and 5 nm, respectively, and the diameter of Ag nanoparticles is in the range 2-20 nm. Moreover, the noble metal nanoparticles have good dispersity on the particles of the TiO 2 support, resulting in excellent catalytic activities. Complete conversion in catalytic CO oxidation is reached at temperatures as low as 333 and 363 K, respectively, for Pt@TiO 2 and Pd@TiO 2 catalysts. In addition, the antibacterial effects of the as-synthesized TiO 2 nanoparticles, silver nanoparticles, and Au@TiO 2 and Ag@TiO 2 nanocomposites have been tested against Gram-negative Escherichia coli (E. coli) bacteria. The results demonstrate that the presence of the TiO 2 matrix enhances the antibacterial effect of silver nanoparticles, and the growth of E. coli can be completely inhibited even if the concentration of Ag in Ag@TiO 2 nanocomposite is very low (10 μg/mL).

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Section: Catalytic Performance Of Pt@tio 2 and Pd@tio 2 In The Co Oximentioning

confidence: 99%

Large scale photochemical synthesis of M@TiO2 nanocomposites (M = Ag, Pd, Au, Pt) and their optical properties, CO oxidation performance, and antibacterial effect

et al. 2010

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“…Pt-Rh bimetallic nanoparticles with variable composition and constant size (9 ± 1 nm) were synthesized by a one-pot polyol synthetic method 48 . The activity of CO oxidation on these bimetallic nanoparticles was studied 49 .…”

Section: Composition Dependence Of Catalytic Reaction Rates Of Bimetamentioning

confidence: 99%

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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“…Over the last several decades, surface science has undergone revolutionary advances that reveal on the atomic-and molecular-level structural, dynamic, compositional, and thermodynamic properties of surfaces that are utilized in chemical process development to correlate these data with adsorption and reaction rates and catalytic selectivity to deliver desired chemical properties (1)(2)(3)(4)(5)(6)(7)(8)(9). In this review, we highlight recent studies of three important aspects in developing instrumentation, concepts, and model systems that permitted the rapid evolution of surface science.…”

Section: Introductionmentioning

confidence: 99%

Concepts, instruments, and model systems that enabled the rapid evolution of surface science

Somorjai

Park

2009

Surface Science

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Over the past forty years, surface science has evolved to become both an atomic scale and a molecular scale science. Gerhard Ertl's group has made major contributions in the field of molecular scale surface science, focusing on vacuum studies of adsorption chemistry on single crystal surfaces. In this review, we outline three important aspects that led to the recent advances of surface chemistry: the development of concepts, in situ instruments for molecular scale surface studies at buried interfaces (solid-gas and solidliquid), and new model nanoparticle surface systems in addition to single crystals.Combined molecular beam surface scattering and low energy electron diffraction (LEED)-surface structure studies on metal single crystal surfaces revealed new concepts, including adsorbate-induced surface restructuring and the unique activity of defects, atomic steps and kinks on metal surfaces. We have combined high pressure catalytic reaction studies with ultrahigh vacuum (UHV) surface characterization techniques using the UHV chamber equipped with a high-pressure reaction cell. New instruments, such as high pressure sum frequency generation (SFG) vibrational spectroscopy and scanning tunneling microscopy (STM) have been built that permit molecular-level surface studies performed at pressures. Tools that can access broad ranges of pressures can be used for both the in situ characterization of buried interfaces of solid-gas and solid-liquid and the study of catalytic reaction intermediates. The model systems for the study of molecular 2 surface chemistry have evolved from single crystals to nanoparticles in the 1-10 nm size range, which are the preferred media in catalytic reaction studies.

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

Cited by 208 publications

References 29 publications

Large scale photochemical synthesis of M@TiO2 nanocomposites (M = Ag, Pd, Au, Pt) and their optical properties, CO oxidation performance, and antibacterial effect

Large scale photochemical synthesis of M@TiO2 nanocomposites (M = Ag, Pd, Au, Pt) and their optical properties, CO oxidation performance, and antibacterial effect

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

Concepts, instruments, and model systems that enabled the rapid evolution of surface science

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