Catalytic CO oxidation reaction studies on lithographically fabricated platinum nanowire arrays with different oxide supports

Contreras, A. M.; Yan, Xiaoming; Kwon, S.; Bokor, Jeffrey; Somorjai, Gábor A.

doi:10.1007/s10562-006-0123-x

Cited by 27 publications

(30 citation statements)

References 37 publications

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“…Oxidation of CO is commonly employed to examine the interaction between Pt and metal oxides because the activation energy of Pt loaded on a metal oxide is highly dependent on the nature of metal oxide support. 21,22,23 The strong Pt-metal oxide interaction decreases electron donation from Pt to adsorbed CO weakening the CO bond. As the result, the interaction between Pt and the metal oxide increases the activation energy for CO oxidation.…”

Section: Resultsmentioning

confidence: 99%

Nanocrystal bilayer for tandem catalysis

et al. 2011

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High performance catalysts are central for the development of new generation energy conversion and storage technologies. 1,2 While industrial catalysts can be optimized empirically by tuning the elemental composition, changing the supports, or altering preparation conditions in order to achieve higher activity and selectivity, these conventional catalysts are typically not uniform in composition and/or surface structure at the nano-to micro-scale. In order to significantly improve our capability of designing better catalysts, new concepts for the rational design and assembly of metal-metal oxide interfaces are desired. Metal nanocrystals with well-controlled shape and size are interesting materials for catalyst design from both electronic structure and surface structure aspects. 3,4,5 From the electronic structure point of view, small metal nanoclusters have size-dependent electronic states, which make them fundamentally different from the bulk. From the surface structure point of view, the shaped nanocrystals have surfaces with well-defined atomic arrangements. It has been clearly demonstrated by surface science studies in recent decades that the atomic arrangement on the crystal surface can affect catalytic phenomena in terms of activity, selectivity, and durability.

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Section: Resultsmentioning

confidence: 99%

Nanocrystal bilayer for tandem catalysis

et al. 2011

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“…From HRTEM image, it was also found the formation of the metal-metal oxide interface because no large capping agents formed on the surface of Pd nanocrystals by using our method. The strong metalmetal oxide interaction would increase the activation energy for some catalytic reactions [35]. The overall weight percentage of Pd in the PANI/SnO 2 /Pd composite nanorods was 7.9 %, which was determined by ICP atomic spectrum measurements.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Xue

Nie

2012

Catal Lett

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A facile and aqueous-phase method based on the electron transfer reduction process for fabricating coresheath structured polyaniline (PANI)/SnO 2 composite nanorods supported Pd nanocatalyst has been demonstrated. The Pd nanoparticles synthesized by this strategy have a small size of smaller than 3.0 nm. The well dispersed Pd nanoparticles with small sizes supported on coresheath PANI/SnO 2 composite nanorods exhibited an ultrahigh catalytic activity during the catalytic reduction of p-nitrophenol into p-aminophenol by NaBH 4 in aqueous solution. The kinetic apparent rate constant (k app ) reach to be about 26.9 9 10 -3 s -1 . It is believed that this method could be extended to cover many kinds of other functional composite nanomaterials where the active component is expected to bring in new features and applications.

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“…Our model single crystal catalysts cannot possibly identify all the active sites that are important to describe catalytic selectivity, as the catalysts are nanoparticles usually supported on oxide surfaces. Therefore, we undertook the development of model nanoparticles by electron beam lithography, photolithography [44] , and finally, which was the most successful, using colloid chemistry controlled nanoparticle synthesis. Catalysts are in the 1-10 nm range, and their shape, whether they are cubic or hexagonal, is very important in controlling selectivity as well as activity.…”

Section: Studies Of Catalytic Activity and Selectivity With Singlmentioning

confidence: 99%

Evolution of the surface science of catalysis from single crystals to metal nanoparticles under pressure

Somorjai

Park

2008

The Journal of Chemical Physics

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Vacuum studies of metal single crystal surfaces using electron and molecular beam scattering revealed that the surface atoms relocate when the surface is clean (reconstruction) and when it is covered by adsorbates (adsorbate induced restructuring).It was also discovered that atomic steps and other low coordination surface sites are active for breaking chemical bonds (H-H, O=O, C-H, C=O and C-C) with high reaction probability. Investigations at high reactant pressures using sum frequency generation (SFG) -vibrational spectroscopy and high pressure scanning tunneling microscopy (HPSTM) revealed bond breaking at low reaction probability sites on the adsorbatecovered metal surface, and the need for adsorbate mobility for continued turnover. Since most catalysts (heterogeneous, enzyme and homogeneous) are nanoparticles, colloid synthesis methods were developed to produce monodispersed metal nanoparticles in the 1-10 nm range and controlled shapes to use them as new model catalyst systems in twodimensional thin film form or deposited in mesoporous three-dimensional oxides. Studies of reaction selectivity in multipath reactions (hydrogenation of benzene, cyclohexene and crotonaldehyde) showed that reaction selectivity depends on both nanoparticle size and shape. The oxide-metal nanoparticle interface was found to be an important catalytic site because of the hot electron flow induced by exothermic reactions like carbon monoxide oxidation.

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Catalytic CO oxidation reaction studies on lithographically fabricated platinum nanowire arrays with different oxide supports

Cited by 27 publications

References 37 publications

Nanocrystal bilayer for tandem catalysis

Nanocrystal bilayer for tandem catalysis

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Evolution of the surface science of catalysis from single crystals to metal nanoparticles under pressure

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