Theoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling method
The title reaction is an important step in the synthesis of ammonia over ruthenium-based catalysts, which have recently received increasing attention. The study presented here is fully theoretical and uses a reduced dimensionality approach to the surface reaction. A potential energy surface is first...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2004
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| _version_ | 1797104542899240960 |
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| author | Volpi, A Clary, D |
| author_facet | Volpi, A Clary, D |
| author_sort | Volpi, A |
| collection | OXFORD |
| description | The title reaction is an important step in the synthesis of ammonia over ruthenium-based catalysts, which have recently received increasing attention. The study presented here is fully theoretical and uses a reduced dimensionality approach to the surface reaction. A potential energy surface is first obtained by density functional calculations using a supercell approach. We have then calculated rate constants in the range of temperature 200-1000 K, which includes the temperature at which the ammonia production is usually performed. This has been done within the framework of variational transition-state theory in a reaction-path formulation, comparing different levels of theory and including quantum transmission and reflection effects by semiclassical methods. Calculated rates are fitted by the Arrhenius law. Finally, we have carried out an accurate investigation of the isotopic effect by replacing hydrogen with deuterium. |
| first_indexed | 2024-03-07T06:35:14Z |
| format | Journal article |
| id | oxford-uuid:f765d024-ce0c-4e2d-bda4-ad5b390639d8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:35:14Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:f765d024-ce0c-4e2d-bda4-ad5b390639d82022-03-27T12:42:19ZTheoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling methodJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f765d024-ce0c-4e2d-bda4-ad5b390639d8EnglishSymplectic Elements at Oxford2004Volpi, AClary, DThe title reaction is an important step in the synthesis of ammonia over ruthenium-based catalysts, which have recently received increasing attention. The study presented here is fully theoretical and uses a reduced dimensionality approach to the surface reaction. A potential energy surface is first obtained by density functional calculations using a supercell approach. We have then calculated rate constants in the range of temperature 200-1000 K, which includes the temperature at which the ammonia production is usually performed. This has been done within the framework of variational transition-state theory in a reaction-path formulation, comparing different levels of theory and including quantum transmission and reflection effects by semiclassical methods. Calculated rates are fitted by the Arrhenius law. Finally, we have carried out an accurate investigation of the isotopic effect by replacing hydrogen with deuterium. |
| spellingShingle | Volpi, A Clary, D Theoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling method |
| title | Theoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling method |
| title_full | Theoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling method |
| title_fullStr | Theoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling method |
| title_full_unstemmed | Theoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling method |
| title_short | Theoretical investigation of the surface reaction N-(ads)+H-(ads)-> NH(ads) on Ru(0001) using density functional calculations, variational transition-state theory, and semiclassical tunneling method |
| title_sort | theoretical investigation of the surface reaction n ads h ads gt nh ads on ru 0001 using density functional calculations variational transition state theory and semiclassical tunneling method |
| work_keys_str_mv | AT volpia theoreticalinvestigationofthesurfacereactionnadshadsgtnhadsonru0001usingdensityfunctionalcalculationsvariationaltransitionstatetheoryandsemiclassicaltunnelingmethod AT claryd theoreticalinvestigationofthesurfacereactionnadshadsgtnhadsonru0001usingdensityfunctionalcalculationsvariationaltransitionstatetheoryandsemiclassicaltunnelingmethod |