Dynamics on Microcomposite Catalytic Surfaces: The Effect of Active Boundaries

1999 ◽  
Vol 83 (14) ◽  
pp. 2857-2860 ◽  
Author(s):  
Stanislav Y. Shvartsman ◽  
Eckart Shütz ◽  
Ronald Imbihl ◽  
Ioannis G. Kevrekidis
Keyword(s):  
Catalytic Surfaces

Host-Guest Interactions on Electrode Surfaces for Immobilization of Molecular Catalysts

2020 ◽  
Author(s):  
Laurent Sévery ◽  
Jacek Szczerbiński ◽  
Mert Taskin ◽  
Isik Tuncay ◽  
Fernanda Brandalise Nunes ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Heterogeneous Systems ◽  
Catalytic Systems ◽  
New Approach ◽  
Molecular Systems ◽  
Electrode Surfaces ◽  
Catalytic Surfaces ◽  
Oxide Electrodes ◽  
The Stability ◽  
Molecular Catalysts

The strategy of anchoring molecular catalysts on electrode surfaces combines the high selectivity and activity of molecular systems with the practicality of heterogeneous systems. The stability of molecular catalysts is, however, far less than that of traditional heterogeneous electrocatalysts, and therefore a method to easily replace anchored molecular catalysts that have degraded could make such electrosynthetic systems more attractive. Here, we apply a non-covalent “click” chemistry approach to reversibly bind molecular electrocatalysts to electrode surfaces via host-guest complexation with surface-anchored cyclodextrins. The host-guest interaction is remarkably strong and allows the flow of electrons between the electrode and the guest catalyst. Electrosynthesis in both organic and aqueous media was demonstrated on metal oxide electrodes, with stability on the order of hours. The catalytic surfaces can be recycled by controlled release of the guest from the host cavities and readsorption of fresh guest. This strategy represents a new approach to practical molecular-based catalytic systems.

Design of well balanced hydrophilic–lipophilic catalytic surfaces for the direct and selective monoesterification of various polyols

2005 ◽  
Vol 29 (7) ◽  
pp. 928 ◽  
Author(s):  
Ghizlane Kharchafi ◽  
François Jérôme ◽  
Isabelle Adam ◽  
Yannick Pouilloux ◽  
Joël Barrault
Keyword(s):  
Catalytic Surfaces

On the deactivation of porous catalytic surfaces

1993 ◽  
Vol 5 (33A) ◽  
pp. A227-A228
Author(s):  
R J Faccio ◽  
A M Vidales ◽  
G Zgrablich
Keyword(s):  
Catalytic Surfaces

scholarly journals Oxygen-tolerant proton reduction catalysis: much O2 about nothing?

2015 ◽  
Vol 8 (8) ◽  
pp. 2283-2295 ◽  
Author(s):  
David W. Wakerley ◽  
Erwin Reisner
Keyword(s):  
Adverse Effects ◽  
Proton Reduction ◽  
Catalytic Surfaces ◽  
Enzymatic Systems

This perspective summarises strategies for avoiding adverse effects of O2 on H2-evolving enzymatic systems, molecular synthetic catalysts and catalytic surfaces.

scholarly journals Roadmap for Modeling RhPt/Pt(111) Catalytic Surfaces

2018 ◽  
Vol 122 (46) ◽  
pp. 26430-26437
Author(s):  
Jian Zheng ◽  
Oleksii Ivashenko ◽  
Helmer Fjellvåg ◽  
Irene M. N. Groot ◽  
Anja O. Sjåstad
Keyword(s):  
Catalytic Surfaces

scholarly journals Steps on Pt stereodynamically filter sticking of O2

2019 ◽  
Vol 116 (28) ◽  
pp. 13862-13866 ◽  
Author(s):  
Kun Cao ◽  
Richard van Lent ◽  
Aart W. Kleyn ◽  
Mitsunori Kurahashi ◽  
Ludo B. F. Juurlink
Keyword(s):  
Linear Dependence ◽  
Incident Energy ◽  
Molecular Alignment ◽  
Catalytic Surfaces ◽  
Internuclear Axis ◽  
Axis Parallel ◽  
Step Density ◽  
Impact Energies ◽  
Step Type

Low coordinated sites on catalytic surfaces often enhance reactivity, but the underlying dynamical processes are poorly understood. Using two independent approaches, we investigate the reactivity of O2impinging onto platinum and resolve how step edges on (111) terraces enhance sticking. At low incident energy, the linear dependence on step density, independence of step type, and insensitivity to O2’s molecular alignment show that trapping into a physisorbed state precedes molecular chemisorption and dissociation. At higher impact energies, direct molecular chemisorption occurs in parallel on steps and terraces. While terraces are insensitive to alignment of the molecule within the (111) plane, steps favor molecules impacting with their internuclear axis parallel to the edge. Stereodynamical filtering thus controls sticking and dissociation of O2on Pt with a twofold role of steps.

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