Structure sensitivity of the methanation reaction : H2-induced CO dissociation on nickel surfaces
The dissociation of CO serves both as a model test reaction on single crystals and as a relevant reaction step for industrial methanation. We combined extensive density functional theory calculations, ultra-high vacuum experiments on well-defined single crystals, and catalytic activity measurements...
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Veröffentlicht in: | Journal of catalysis 2008-04, Vol.255 (1), p.6-19 |
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creator | ANDERSSON, M. P ABILD-PEDERSEN, F ROSTRUP-NIELSEN, J. R NØRSKOV, J. K CHORKENDORFF, I REMEDIAKIS, I. N BLIGAARD, T JONES, G ENGBAEK, J LYTKEN, O HORCH, S NIELSEN, J. H SEHESTED, J |
description | The dissociation of CO serves both as a model test reaction on single crystals and as a relevant reaction step for industrial methanation. We combined extensive density functional theory calculations, ultra-high vacuum experiments on well-defined single crystals, and catalytic activity measurements on supported catalysts in a study of the dissociation mechanism of CO on Ni surfaces. We found that this process is highly structure-sensitive and also is sensitive to the presence of hydrogen: Under ultra-high vacuum, with no hydrogen present, the dissociation proceeds through a direct route in which only undercoordinated sites (e.g., steps) are active. Under methanation conditions, the dissociation also proceeds most favorably over undercoordinated sites, but through a COH species. [PUBLICATION ABSTRACT] |
doi_str_mv | 10.1016/j.jcat.2007.12.016 |
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P ; ABILD-PEDERSEN, F ; ROSTRUP-NIELSEN, J. R ; NØRSKOV, J. K ; CHORKENDORFF, I ; REMEDIAKIS, I. N ; BLIGAARD, T ; JONES, G ; ENGBAEK, J ; LYTKEN, O ; HORCH, S ; NIELSEN, J. H ; SEHESTED, J</creator><creatorcontrib>ANDERSSON, M. P ; ABILD-PEDERSEN, F ; ROSTRUP-NIELSEN, J. R ; NØRSKOV, J. K ; CHORKENDORFF, I ; REMEDIAKIS, I. N ; BLIGAARD, T ; JONES, G ; ENGBAEK, J ; LYTKEN, O ; HORCH, S ; NIELSEN, J. H ; SEHESTED, J</creatorcontrib><description>The dissociation of CO serves both as a model test reaction on single crystals and as a relevant reaction step for industrial methanation. We combined extensive density functional theory calculations, ultra-high vacuum experiments on well-defined single crystals, and catalytic activity measurements on supported catalysts in a study of the dissociation mechanism of CO on Ni surfaces. We found that this process is highly structure-sensitive and also is sensitive to the presence of hydrogen: Under ultra-high vacuum, with no hydrogen present, the dissociation proceeds through a direct route in which only undercoordinated sites (e.g., steps) are active. Under methanation conditions, the dissociation also proceeds most favorably over undercoordinated sites, but through a COH species. [PUBLICATION ABSTRACT]</description><identifier>ISSN: 0021-9517</identifier><identifier>EISSN: 1090-2694</identifier><identifier>DOI: 10.1016/j.jcat.2007.12.016</identifier><identifier>CODEN: JCTLA5</identifier><language>eng</language><publisher>Amsterdam: Elsevier</publisher><subject>Carbon monoxide ; Catalysis ; Catalysts ; Chemical reactions ; Chemistry ; Crystallography ; Exact sciences and technology ; General and physical chemistry ; Theory ; Theory of reactions, general kinetics. Catalysis. 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We combined extensive density functional theory calculations, ultra-high vacuum experiments on well-defined single crystals, and catalytic activity measurements on supported catalysts in a study of the dissociation mechanism of CO on Ni surfaces. We found that this process is highly structure-sensitive and also is sensitive to the presence of hydrogen: Under ultra-high vacuum, with no hydrogen present, the dissociation proceeds through a direct route in which only undercoordinated sites (e.g., steps) are active. Under methanation conditions, the dissociation also proceeds most favorably over undercoordinated sites, but through a COH species. 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We found that this process is highly structure-sensitive and also is sensitive to the presence of hydrogen: Under ultra-high vacuum, with no hydrogen present, the dissociation proceeds through a direct route in which only undercoordinated sites (e.g., steps) are active. Under methanation conditions, the dissociation also proceeds most favorably over undercoordinated sites, but through a COH species. [PUBLICATION ABSTRACT]</abstract><cop>Amsterdam</cop><pub>Elsevier</pub><doi>10.1016/j.jcat.2007.12.016</doi><tpages>14</tpages></addata></record> |
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subjects | Carbon monoxide Catalysis Catalysts Chemical reactions Chemistry Crystallography Exact sciences and technology General and physical chemistry Theory Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
title | Structure sensitivity of the methanation reaction : H2-induced CO dissociation on nickel surfaces |
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