1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
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Τύπος:	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	CO2 hydrogenation to methanol over La2O3-promoted CuO/ZnO/Al2O3 catalysts: a kinetic and mechanistic study
Συγγραφέας:	[EL] Κουρτελέσης, Μάριος[EN] Kourtelesis, Marios [EL] Κούση, Καλλιόπη[EN] Kousi, Kalliopi [EL] Κονταρίδης, Δημήτριος[EN] Kondarides, Dimitris
Ημερομηνία:	03/02/2020
Περίληψη:	The hydrogenation of CO2 to methanol has been investigated over CuO/ZnO/Al2O3 (CZA) catalysts, where a part of the Al2O3 (0, 25, 50, 75, or 100%) was substituted by La2O3. Results of catalytic performance tests obtained at atmospheric pressure showed that the addition of La2O3 generally resulted in a decrease of CO2 conversion and in an increase of methanol selectivity. Optimal results were obtained for the CZA-La50 catalyst, which exhibited a 30% higher yield of methanol, compared to the un-promoted sample. This was attributed to the relatively high specific surface area and porosity of this material, the creation of basic sites of moderate strength, which enhance adsorption of CO2 and intermediates that favor hydrogenation steps, and the ability of the catalyst to maintain a large part of the copper in its metallic form under reaction conditions. The reaction mechanism was studied with the use of in situ infrared spectroscopy (DRIFTS). It was found that the reaction proceeded with the intermediate formation of surface formate and methoxy species and that both methanol and CO were mainly produced via a common formate intermediate species. The kinetic behavior of the best performing CZA-La50 catalyst was investigated in the temperature range 190–230 °C as a function of the partial pressures of H2 (0.3–0.9 atm) and CO2 (0.05–0.20 atm), and a kinetic model was developed, which described the measured reaction rates satisfactorily.
Γλώσσα:	Αγγλικά
Σελίδες:	18
DOI:	10.3390/catal10020183
ISSN:	2073-4344
Θεματική κατηγορία:	[EL] Φυσική και Θεωρητική χημεία[EN] Physical and Theoretical Chemistry
Λέξεις-κλειδιά:	CO2 hydrogenation; CuO/ZnO/Al2O3 catalyst; La2O3 promoter; DRIFTS; Reaction mechanism; kinetic model; Catalysis
Κάτοχος πνευματικών δικαιωμάτων:	© 2020 by the authors. Licensee MDPI
Όροι και προϋποθέσεις δικαιωμάτων:	This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Διατίθεται ανοιχτά στην τοποθεσία:	https://www.mdpi.com/2073-4344/10/2/183/htm
Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη:	https://www.mdpi.com/2073-4344/10/2/183/htm
Ηλεκτρονική διεύθυνση περιοδικού:	https://www.mdpi.com/journal/catalysts
Τίτλος πηγής δημοσίευσης:	Catalysts
Τεύχος:	2
Τόμος:	10
Σελίδες τεκμηρίου (στην πηγή):	Article no 183
Σημειώσεις:	(This article belongs to the Special Issue Nanomaterials in Catalysis Applications) This research was performed under the research project entitled “Development of Catalysts for CO2 Hydrogenation to Methanol”, which is implemented through/co-financed by the Operational Program "Human Resources Development, Education and Lifelong Learning" and is co-financed by the European Union (European Social Fund) and Greek national funds
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