Alkene chemistry on the palladium surface: nanoparticles vs single crystals

Doyle, Aidan M.; Shaikhutdinov, Shamil K.; Freund, Hans‐Joachim

doi:10.1016/j.jcat.2004.02.020

Cited by 136 publications

(46 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the formation of the multi-σ-bonded surface intermediates requires the Pd ensembles with three contiguous adsorption sites, a common approach to improve the ethylene selectivity is to block these ensembles through the modification with an inert component, so-called "active site isolation concept" [44,45,46]. According to this concept, the isolation of the surface Pd atoms inhibits the formation of multi-σ-adsorbed species and subsequently the formations of ethane, oligomers as well as carbonaceous deposit, while the selectivity to ethylene is enhanced.…”

Section: Relationship Between Catalyst Structure and Performancementioning

confidence: 99%

Selective hydrogenation of acetylene on SiO2 supported Ni-In bimetallic catalysts: Promotional effect of In

Chen

2016

Applied Surface Science

View full text Add to dashboard Cite

Section: Relationship Between Catalyst Structure and Performancementioning

confidence: 99%

Selective hydrogenation of acetylene on SiO2 supported Ni-In bimetallic catalysts: Promotional effect of In

Chen

2016

Applied Surface Science

View full text Add to dashboard Cite

“…Assuming that ZnO islands on both Ag(111) and Pt(111) supports are structurally identical (which seems reasonable due to a weak interaction of a ZnO sheet with a noble metal), the origin of the observed support effect seems to be the adsorption of CO on different metals and of O 2 at the oxide/metal interface. Since CO and O 2 adsorption takes place on different sites which are not competitive, one can apply the model of overlapping states, which asserts that desorption profiles of two reacting entities must overlap for the reaction to occur [38].…”

Section: Reactivity Of Metal-supported Zno(0001) Films: Comparisonmentioning

confidence: 99%

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

et al. 2014

View full text Add to dashboard Cite

Abstract.We studied structure and reactivity of ZnO(0001) ultrathin films grown on Ag (111) and Cu(111) single crystal surfaces. Structural characterization was carried out by scanning tunneling microscopy, Auger electron spectroscopy, low-energy electron diffraction, and temperature programmed desorption. The CO oxidation behavior of the films was studied at low temperature (450 K) at near atmospheric pressures using gas chromatography. For ZnO/Cu(111), it is shown that under reaction conditions ZnO readily migrates into the Cu crystal bulk, and the reactivity is governed by a CuO x oxide film formed in the reaction ambient. In contrast, the planar structure of ZnO films on Ag(111) is maintained, similarly to the previously studied ZnO films on Pt(111). At sub-monolayer coverages, the "inverse" model catalysts are represented by two-monolayer-thick ZnO(0001) islands on Pt(111) and Ag(111) supports. While the CO oxidation rate is considerably increased on ZnO/Pt(111), which is attributed to active sites at the metal/oxide boundary, sub-monolayer ZnO films on Ag(111) did not show such an effect, and the reactivity was inhibited with increasing film coverage. The results are explained by much stronger adsorption of CO on Pt(111) as compared with Ag(111) in proximity to O species at the oxide/metal boundary. In addition, the water-gas shift and reverse water-gas shift reactions were examined on ZnO/Ag(111), which revealed no promotional effect of ZnO on the reactivity of Ag under the conditions studied. The latter finding suggests that wetting phenomena of ZnO on metals does not play a crucial role in the catalytic performance of ZnObased real catalysts in those reactions.

show abstract

“…This topological feature of the potential is well known 33,34,71 and has already been identified as a possible reason for the increased catalytic activity of the subsurface sites of palladium as compared to the resurfacing bulk hydrogen. [9][10][11][12][13] …”

Section: Vibrational Eigenstatesmentioning

confidence: 99%

“…In particular, the hydrogen/palladium system has been widely studied due to its high storage capacity and its importance in catalysis. [5][6][7][8][9][10][11][12][13] It is believed that resurfacing hydrogen is of great importance for the latter application. 11,[14][15][16][17] For some systems, these experiments have even shown that the hydrogen atoms located just below the surface, hereafter denoted as subsurface hydrogens, are more reactive than those ejected from the bulk.…”

Section: Introductionmentioning

confidence: 99%

Selective subsurface absorption of hydrogen in palladium using laser distillation

Tremblay

Saalfrank

2009

The Journal of Chemical Physics

View full text Add to dashboard Cite

A theoretical model for the selective subsurface absorption of atomic hydrogen in a Pd(111) surface by infrared (IR) laser pulses is presented. The dynamics of the adsorbate is studied within the reduced density matrix approach. Energy and phase relaxation of the hydrogen atom are treated using the semigroup formalism. The vibrational excitation leading to subsurface absorption is performed using rationally designed pulses as well as IR laser pulses optimized on-the-fly. It is shown that dissipation can be used as a tool to transfer population to an otherwise inaccessible state via a mechanism known as "laser distillation." We demonstrate that when the reaction path is generalized from a reduced one-dimensional to full three-dimensional treatment of the system, the laser control strategy can prove very different.

show abstract

Alkene chemistry on the palladium surface: nanoparticles vs single crystals

Cited by 136 publications

References 43 publications

Selective hydrogenation of acetylene on SiO2 supported Ni-In bimetallic catalysts: Promotional effect of In

Selective hydrogenation of acetylene on SiO2 supported Ni-In bimetallic catalysts: Promotional effect of In

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

Selective subsurface absorption of hydrogen in palladium using laser distillation

Contact Info

Product

Resources

About