Methanation on Rh surfaces at low pressure and low temperature: A pulsed-laser imaging atom-probe study |
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| Affiliation: | 1. Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930, Sant Adrià de Besòs, Spain;2. Universitat Politècnica de Catalunya (UPC), Eduard Maristany 16, 08019, Barcelona, Spain;3. Escuela Superior Politécnica del Litoral, ESPOL, Facultad de Ingeniería en Ciencias de la Tierra, Campus Gustavo Galindo Km. 30.5 Vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador;4. Universidad Politécnica de Madrid (UPM), Department of Mechanical, Chemical and Industrial Design Engineering, ETSIDI, 28012, Madrid, Spain;1. Laboratory of Alternative Fuels and Environmental Catalysis (LAFEC), Department of Chemical Engineering, University of Western Macedonia, GR-50100, Greece;2. Department of Environmental Engineering, University of Patras, Agrinio, Greece;3. Center for Catalysis and Separation, Khalifa University of Science and Technology, Abu Dhabi, P.O. Box 127788, United Arab Emirates;4. Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi, P.O. Box 127788, United Arab Emirates;5. Chemical and Environmental Engineering Department, Instituto de Nanociencia de Aragón (INA) and Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC, 50018, Zaragoza, Spain;6. Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBERBBN, 28029, Madrid, Spain;7. The Surface Analysis Laboratory, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 4DL, UK;8. Laboratory of Physical Chemistry & Chemical Processes, School of Environmental Engineering, Technical University of Crete, GR-73100, Chania, Greece;1. Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India;2. Wadia Institute of Himalayan Geology, 33, GMS Road, Dehradun 248001, India;3. Ministry of Earth Sciences, Prithvi Bhavan, Lodhi Road, New Delhi 110003, India;1. Laboratory of Alternative Fuels and Environmental Catalysis (LAFEC), Department of Chemical Engineering, University of Western Macedonia, GR-50100, Greece;2. Department of Environmental Engineering, University of Patras, Agrinio, Greece;3. Center for Catalysis and Separation, Khalifa University of Science and Technology, Abu Dhabi, P.O. Box 127788, United Arab Emirates;4. Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi, P.O. Box 127788, United Arab Emirates;5. Chemical and Environmental Engineering Department, Instituto De Nanociencia De Aragón (INA) and Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC, 50018, Zaragoza, Spain;6. Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBERBBN, 28029, Madrid, Spain;7. The Surface Analysis Laboratory, Faculty of Engineering and Physical Sciences,University of Surrey, Guildford, GU2 4DL, UK;8. Laboratory of Physical Chemistry & Chemical Processes, School of Environmental Engineering, Technical University of Crete, GR-73100, Chania, Greece;1. Département de Chimie, Equipe de Catalyse Environnementale, Faculté des Sciences, Université Abdelmalek Essaadi, B.P. 2121 M’Hannech II, 93002 Tétouan, Morocco;2. Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro s/n, 11510 Puerto Real (Cádiz), Spain;3. Instituto Universitario de Investigación en Microscopía Electrónica y Materiales (IMEYMAT), Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro s/n, 11510 Puerto Real (Cádiz), Spain |
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| Abstract: | We have successfully detected methanation on Rh surfaces at low pressure (∼10−8 Torr) and low temperature (150 K) using pulsed-laser imaging atom-probe. Thus it is possible to observe directly the reaction intermediates in a time-of-flight mass spectrum and study the atomic steps of such reaction. We find direct evidence of dissociative chemisorption of CO on Rh surfaces and show that under the conditions of our experiment, a dissociative mechanism is responsible for methanation on Rh surfaces. We have also observed an oscillation in signal intensity of CO+ and that of methanation products with a time period of ∼ 8 s under the conditions of that experiment. |
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