Catalytic Activity and Poisoning of Specific Sites on Supported Metal Nanoparticles

Schauermann, Swetlana; Hoffmann, Jens; Johánek, Viktor; Hartmann, Jens; Libuda, Jörg; Freund, Hans‐Joachim

doi:10.1002/1521-3773(20020715)41:14<2532::aid-anie2532>3.0.co;2-3

Cited by 173 publications

(165 citation statements)

References 21 publications

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“…16,17 PdNPs have been immobilized on a variety of solid materials such as charcoal, clay, silica, alumina, and zeolites. [18][19][20][21][22] Practical and durable PdNP catalytic systems achieved via the postcapturing procedure have been reported, 23 though complicated stepwise procedures, leaching-out of nanoparticles, and a lack of reproducibility remain as drawbacks. For the purpose of improving those systems, we here propose a new and convenient strategy for formation of a submicro-metal oxide-reactor dotted with palladium(0) nanoparticles by means of the direct coating of silica onto submicrospheres (SMS) consisting of palladium(II) complexes (utilized as both template and catalyst source), followed by calcination.…”

Section: -15mentioning

confidence: 99%

Submicrospheres as Both a Template and the Catalyst Source. Silica Submicro-reactor Dotted with Palladium Nanoparticles as Catalysts

Kim¹,

Noh²,

Jung³

2013

Bulletin of the Korean Chemical Society

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), has been carried out without any templates or additives. The submicrospheres were coated with silicates, and then calcined in air at 550 °C for 1 h, to efficiently form hollow-spherical SiO 2 submicro-reactors dotted with palladium(0) nanoparticles (PdNPs). That is, the submicrospheres act as both a template and a source of the palladium metal nanoparticles. The submicro-reactors containing nano-catalysts have been characterized by means of SEM, TEM, and XPS. Notably, the reactors were proved to be very effective for Suzuki-Miyaura cross-coupling and hydrogenation reactions.

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Section: -15mentioning

confidence: 99%

Submicrospheres as Both a Template and the Catalyst Source. Silica Submicro-reactor Dotted with Palladium Nanoparticles as Catalysts

Kim¹,

Noh²,

Jung³

2013

Bulletin of the Korean Chemical Society

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“…These specific sites may exhibit specific activities with respect to a given reaction. In a series of studies, we have recently investigated the role of specific reactive sites on supported metal particles for the specific cases of NO dissociation and reduction 21,22 as well as for CH 3 OH dissociation and dehydrogenation 23,24 on Pd model catalysts. In these studies information could be extracted on the activity and selectivity of specific sites on such particles, such as crystallite facets, edges or steps.…”

Section: Reaction Kinetics On Simple and Complex Surfaces: What Is DImentioning

confidence: 99%

“…For the case of CH 3 OH decomposition it was possible to assign specific selectivities for the two competing reaction pathways, i.e. C-H and the C-O bond scission, to different particle sites such as facets, edges and steps 23 . In a different type of experiment, the distribution of local reaction rates over the particle surface has been measured by angle resolved detection of the CO 2 product.…”

Section: Kinetic Experiments On Complex Model Catalystsmentioning

confidence: 99%

“…On the basis of comparisons with reference data on single crystals (see discussion in 23,43 ) and DFT cluster calculations 43 , three spectral regions can be identified and assigned: The band at 1990 cm -1 can be attributed to bridge-bonded CO on Pd(100) facets, particle edges and defects such as steps. It shows a broad shoulder ranging down to around 1900 cm -1 , which contains contributions from CO on bridge and hollow sites, mainly on (111) terraces.…”

Section: Kinetic Experiments On Complex Model Catalystsmentioning

confidence: 99%

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Model studies in heterogeneous catalysis at the microscopic level: from the structure and composition of surfaces to reaction kinetics

et al. 2006

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Heterogeneous catalysis is one of the fields of modern technology, in which a characterization of structural and chemical properties of solid surfaces at the microscopic level is of enormous importance. For a long time, such insights have been precluded by the complexity of most catalytically active materials. Recently, substantial progress has been made, however, toward a microscopic-level understanding of complex catalyst surfaces. We discuss the driving factors for these advancements, which are based on the development of new well-defined model systems as well as on advances in experimental technology and theory. Scrutinizing the example of planar model catalysts, we identify the process of linking structural and chemical information to microscopic reaction kinetics as a particular challenging aspect of today's work. We review the kinetic effects which may have an influence on the reaction kinetics on complex surfaces. As an example how structural and kinetic information can be correlated at the microscopic level we discuss the case of surface oxidation and oxygen induced restructuring of Pd nanoparticles as studied by molecular beam methods.

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“…Here, we will discuss a few recent examples from the author's laboratory, i.e., methanol dehydrogenation on Pd nanoparticles [8,9], methanol oxidation on vanadia surfaces [10], ethene hydrogenation on Pd nanoparticles [11][12][13][14], and CO adsorption on Au atoms and clusters [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Model Systems in Heterogeneous Catalysis: Selectivity Studies at the Atomic Level

Freund

2008

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Reaching 100% selectivity is the theme of the twentyfirst century in heterogeneous and heterogenized homogeneous catalysis. To study chemical reactivity at the atomic scale, model systems have been prepared and characterized. We discuss selectivity of hydrogenation and dehydrogenation reactions on supported Pd particles, methanol oxidation at vanadium oxide model catalysts and, at last, the design of model catalysts with a well defined charge state of the metal, i.e., Au catalyst model systems.

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Catalytic Activity and Poisoning of Specific Sites on Supported Metal Nanoparticles

Cited by 173 publications

References 21 publications

Submicrospheres as Both a Template and the Catalyst Source. Silica Submicro-reactor Dotted with Palladium Nanoparticles as Catalysts

Submicrospheres as Both a Template and the Catalyst Source. Silica Submicro-reactor Dotted with Palladium Nanoparticles as Catalysts

Model studies in heterogeneous catalysis at the microscopic level: from the structure and composition of surfaces to reaction kinetics

Model Systems in Heterogeneous Catalysis: Selectivity Studies at the Atomic Level

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