Infrared spectra and the structures of the chemisorbed species resulting from the adsorption of propene and propane on a Pt/SiO2 catalyst |
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| Institution: | 1. Gas-Phase Kinetics Research Laboratory, National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan;2. Department of Chemistry, The University of Lahore, Lahore, Pakistan;3. Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan;4. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;1. Dpto. de Física, Escuela Politécnica de Ingeniería, Universidad de Oviedo, 33204 Gijón, Spain;2. Dpto. de Ciencia de los Materiales e Ingeniería Metalúrgica, Escuela Politécnica de Ingeniería, Universidad de Oviedo, 33204 Gijón, Spain;3. Dpto. de Química Orgánica e Inorgánica, Universidad de Oviedo-CINN, 33006 Oviedo, Spain;4. Dpto. de Matemáticas, Escuela Politécnica de Ingeniería, Universidad de Oviedo, 33204 Gijón, Spain;1. Université de Tunis El-Manar, Faculté des sciences de Tunis, Laboratoire de chimie des matériaux et catalyse, 2092 Tunis, Tunisia;2. Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Facultad de Ciencias, C.S.I.C.-Universidad de Zaragoza, 50009 Zaragoza, Spain;1. Sciences, Laboratory of Advanced Materials and Interfaces, Monastir University, 5019, Tunisia;2. Research Lab: Energy and Matter, Development of Nuclear Sciences, National Center for Nuclear Sciences and Technology, 2020 Sidi-Thabet, Tunisia;3. ISTLS, Campus Erriadh, University of Sousse, Sousse 4029, Tunisia;4. Material Sciences Research Centre, Natural Resources and Recuperated Materials Valorization Laboratory, Technopole of Borj-Cédria, BP 273, 8020 Soliman, Tunisia;1. Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, Sofia 1113, Bulgaria;2. Aix Marseille Université CNRS, CINaM, UMR 7325, 13288 Marseille, France |
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| Abstract: | The infrared spectrum from propane adsorbed on a Pt/SiO2 catalyst at room temperature is readily interpreted in terms of the presence of a predominantly propylidyne surface species; additional absorptions in the spectrum from propene indicate the presence also of non-dissociative species, i.e. considerable amounts of di-σ species and a smaller amount of the π-bonded species. With adsorbed propene, heating in vacuum above 130°C leads to the breakdown of the initially adsorbed species to give ethylidyne, implying CC bond-breaking and an increasingly alkenyl-type dehydrogenated surface species. The addition of H2 at room temperature to the species from adsorbed propene leads largely to the removal of the surface species as propane; the residual surface species are alkyl in type and at elevated temperatures (>100°C) are reversibly dehydrogenated by pumping. Methane desorption is observed in H2 at 300°C and the spectra of the remaining surface alkyl species show the presence of lengthened hydrocarbon chains, implying an overall process of disproportionation. |
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