1. Ab Initio Surface Phase Diagrams for Coadsorption of Aromatics and Hydrogen on the Pt(111) Surface
- Author
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Vassili Vorotnikov, David J. Robichaud, Glen Allen Ferguson, Gregg T. Beckham, Kenny Gruchalla, Nicholas D. Wunder, Jared M. Clark, and Timothy V. Bartholomew
- Subjects
Surface (mathematics) ,Hydrogen ,Inorganic chemistry ,Ab initio ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Catalysis ,chemistry.chemical_compound ,General Energy ,chemistry ,Computational chemistry ,Density functional theory ,Guaiacol ,Physical and Theoretical Chemistry ,0210 nano-technology ,Pyrolysis ,Deoxygenation - Abstract
Supported metal catalysts are commonly used for the hydrogenation and deoxygenation of biomass-derived aromatic compounds in catalytic fast pyrolysis. To date, the substrate–adsorbate interactions under reaction conditions crucial to these processes remain poorly understood, yet understanding this is critical to constructing detailed mechanistic models of the reactions important to catalytic fast pyrolysis. Density functional theory (DFT) has been used in identifying mechanistic details, but many of these works assume surface models that are not representative of realistic conditions, for example, under which the surface is covered with some concentration of hydrogen and aromatic compounds. In this study, we investigate hydrogen-guaiacol coadsorption on Pt(111) using van der Waals-corrected DFT and ab initio thermodynamics over a range of temperatures and pressures relevant to bio-oil upgrading. We find that relative coverage of hydrogen and guaiacol is strongly dependent on the temperature and pressure o...
- Published
- 2016
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