Dynamics of ethane and propane in zeolite ZSM-5 studied by quasi-elastic neutron scattering |
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| Affiliation: | 1. Shanghai EBIT Lab, the Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai 200433, China;2. Department of Computer Science, University of British Columbia, Vancouver, V6T 1Z4, Canada;3. Chimie Quantique et Photophysique, CP160/09, Université libre de Bruxelles, Av. F.D. Roosevelt 50, 1050 Brussels, Belgium;4. Hebei Key Lab of Optic-electronic Information and Materials, The College of Physics Science and Technology, Hebei University, Baoding 071002, China;5. Space Science Laboratory, University of California, Berkeley, CA 94720, USA;1. Center of Material Sciences, Institute of Interdisciplinary Studies, University of Allahabad, Allahabad 211002, India;2. Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080, India;4. Department of Pediatrics, Boston University School of Medicine;5. Section of Preventive Medicine and Epidemiology, Department of Medicine, Boston University School of Medicine, Boston, MA;6. Division of Graduate Medical Sciences, Boston University School of Medicine, Boston, MA;7. Department of Biostatistics, Boston University School of Public Health, Boston, MA;8. Department of Epidemiology, Boston University School of Public Health, Boston, MA;9. School of Social and Community Medicine, University of Bristol, Bristol, UK;10. School of Oral and Dental Sciences, University of Bristol, Bristol, UK;11. Program in Gastronomy, Culinary Arts, and Wine Studies, Boston University Metropolitan College, Boston, MA;1. Department of Physics, Arignar Anna Government Arts College, Musiri, Tiruchirappalli 621211, India;2. Department of Physics, Govt. Arts College, Tiruchirappalli 620022, India;3. Department of Physics, SRM University, Ramapuram, Chennai 600089, India;4. Department of Physics, Srimad Andavan Arts and Science College, Tiruchirappalli 620005, India;5. Department of Physics, M.I.E.T. Engineering College, Tiruchirappalli 620007, India;1. Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação (LIBPhys-UNL), Departamento de Física, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Monte da Caparica, 2892-516 Caparica, Portugal;2. Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, Case 74; 4, place Jussieu, F-75005 Paris, France;3. Department of Physics, University of Ioannina, GR 45110 Ioannina, Greece;4. Department of Physics, University of Crete, P.O. Box 2208, GR 71003 Heraklion, Greece;1. Depto. de Matemática, Universidad Nacional de Rosario, Rosario, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina |
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| Abstract: | Quasi-elastic neutron scattering has been used to study the dynamics of ethane and propane in zeolite ZSM-5. The experiments were performed at different loadings for the two alkanes and at different temperatures for propane. The long-range translational motion of the molecules has been observed and has been interpreted with a jump diffusion model, the mean jump lengths being of the order of 10 Å, slightly decreasing with increasing loading. The self-diffusion coefficients of ethane are about 2 × 10−9 m2 s−1 at 300 K, those of propane at the same temperature being smaller by a factor of two. An activation energy of 5 kJ mol−1 is obtained for the self-diffusion of propane. These results are in good agreement with the pulsed-field gradient n.m.r. measurements. In addition to the translational motion, a rotational motion of the two molecules is also observed; it is described by an uniaxial rotational diffusion model and rotational diffusion constants are derived. |
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