Supported ?bimetallic cluster? catalysts

Sinfelt, J. H.

doi:10.1016/0021-9517(73)90234-0

Cited by 483 publications

(113 citation statements)

References 10 publications

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“…The reactivity and selectivity of metal clusters can be dramatically affected by the presence of a second metal component [60][61][62][63][64][65]. For example, in the reaction of dihydrogen and dioxygen to form water over supported Pd and PdAu catalysts, the turnover rate per surface Pd atom when a PdAu catalyst is used is 50 times greater than when using a pure Pd catalyst [62].…”

Section: Catalytic Metal Clustersmentioning

confidence: 99%

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Baker¹,

Roy

Gurman

et al. 2009

J. Phys.: Condens. Matter

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It has been appreciated for some time that the novel properties of particles in the size range 1 -10 nm are potentially exploitable in a range of applications. In order to ultimately produce commercial devices containing nanosized particles, it is necessary to develop controllable means of incorporating them into macroscopic samples. One way of doing this is to embed the nanoparticles in a matrix of a different material, by co-deposition for example, to form a nanocomposite film. The atomic structure of the embedded particles can be strongly influenced by the matrix. Since some of the key properties of materials, including magnetism, strongly depend on atomic structure the ability to determine atomic structure in embedded nanoparticles is therefore very important. This review focuses on nanoparticles, in particular magnetic nanoparticles, embedded in different metal matrices. EXAFS provides an excellent means of probing atomic structure in nanocomposite materials, and an overview of the technique is given. Its application to catalytic metal clusters is described briefly, before giving an account of the use of EXAFS in determining atomic structure in magnetic nanocomposite films. In particular, we focus on cluster-assembled films comprised of Fe and Co nanosized particles embedded in various metal matrices, and show how the crystal structure of the particles can be changed by appropriate choice of matrix material. The work discussed here demonstrates that combining the results of structural and magnetic measurements, as well as theoretical calculations, can play a significant part in tailoring the properties of new magnetic cluster-assembled materials.

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Section: Catalytic Metal Clustersmentioning

confidence: 99%

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Baker¹,

Roy

Gurman

et al. 2009

J. Phys.: Condens. Matter

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“…Bimetallic alloy nanoparticles (i.e., metallic entities comprising atoms of two different metallic elements) offer improved catalytic properties relative to their single-metal counterparts [88,89] . Studies have shown that the alloy structure of bimetallic nanoparticles affects the catalytic properties [90 -92] .…”

Section: Synthesis Of Bimetallic Nanoparticlesmentioning

confidence: 99%

Nanoscale materials for organohalide degradation via reduction pathways

Bolandi

Nick

Obare

2012

Nanotechnology Reviews

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The unique chemical and physical properties of nanoscale materials have led to important roles in several scientifi c and technological fi elds. Environmental chemistry processes have benefi ted from the enhanced reactivity of nanoscale particles relative to their bulk counterparts with contaminants. Here, we describe recent advances in the synthesis and characterization of metallic and bimetallic nanoparticles that have been effective toward degrading toxic organohalide contaminants. We then review the degradation mechanisms involved in the reactions of nanoscale particles with organohalides via reduction pathways. We also discuss an emerging area -the degradation of organohalides via multi-electron transfer pathways.

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“…The electronic structure and properties of small metal clusters have gained considerable attention on account of their theoretical and experimental interest, as useful models for crystals (1)(2)(3), point defects (4), catalysis (5)(6)(7), and chemisorption (8)(9)(10)(11)(12)(13). Among the various metal clusters that have been investigated theoretically, probably beryllium clusters of varying size have been studied most extensively (14)(15)(16)(17)(18)(19)(20)(21).…”

Section: Introductionmentioning

confidence: 99%

Ab initio molecular orbital studies of the potential energy curves for the low lying triplet states of Be₂ and Be₃

Gosavi¹,

Strausz²

1988

Can. J. Chem.

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Ab initio calculations with uniform quality gaussian basis set were carried out at the RHF-SCF and CI level on the potential energy curves of the low lying triplet states of Be2 and Be3. The lowest excited state, the [Formula: see text] state of Be2 is 26.0 kcal/mol higher in energy than the ground [Formula: see text] state, and 39.4 kcal/mol lower than the separated Be(1S0) + Be(3P) atoms, with the s, p, d basis set. The next higher triplet state, the 3Πg, is only 8.7 kcal/mol above the lowest [Formula: see text] state. The [Formula: see text] and 3Πu states lie comparatively much higher than the [Formula: see text] state. All the triplet state potential curves have a bonding nature. The lowest triplet state [Formula: see text] in Be3 with D∞h symmetry lies ~15 kcal/mol above the ground [Formula: see text] state, and 48.2 kcal/mol lower than the separated atoms, 2Be(1S0) + Be(3P). The [Formula: see text] state has 1,3-diradical character and in all the higher triplet states α spin electrons are delocalized among the three Be atoms. The next higher triplet state 3Πu is 7.7 kcal/mol above the lowest [Formula: see text] state. The [Formula: see text] and 3Πg states lie much higher than the [Formula: see text] and 3Πu states. Like the triplet states of Be2, all Be3 triplet states have a bonding nature. Reaction path studies on the Be(3P) energy transfer reactions, [Formula: see text] and [Formula: see text] show that these reactions do not feature any activation energy barrier.

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Supported ?bimetallic cluster? catalysts

Cited by 483 publications

References 10 publications

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Nanoscale materials for organohalide degradation via reduction pathways

Ab initio molecular orbital studies of the potential energy curves for the low lying triplet states of Be₂ and Be₃

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Supported ?bimetallic cluster? catalysts

Cited by 483 publications

References 10 publications

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Nanoscale materials for organohalide degradation via reduction pathways

Ab initio molecular orbital studies of the potential energy curves for the low lying triplet states of Be2 and Be3

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Product

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Ab initio molecular orbital studies of the potential energy curves for the low lying triplet states of Be₂ and Be₃