Totally-green Fuels via CO2 Hydrogenation

*Lorenzo Spadaro orcid scopus  -  Dipartimento di Ingegneria, Università degli Studi di Messina, Italy
Alessandra Palella orcid  -  Istituto CNR di Tecnologie Avanzate per l’Energia “Nicola Giordano”, Italy
Francesco Arena  -  Dipartimento di Ingegneria, Università degli Studi di Messina, Italy
Received: 1 Feb 2020; Revised: 21 Apr 2020; Accepted: 23 Apr 2020; Published: 1 Aug 2020; Available online: 30 Jul 2020.
Open Access Copyright (c) 2020 Bulletin of Chemical Reaction Engineering & Catalysis
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Hydrogen is the cleanest energy vector among any fuels, nevertheless, many aspects related to its distribution and storage still raise serious questions concerning costs, infrastructure and safety. On this account, the chemical storage of renewable-hydrogen by conversion into green-fuels, such as: methanol, via CO2 hydrogenation assumes a role of primary importance, also in the light of a cost-to-benefit analysis. Therefore, this paper investigates the effects of chemical composition on the structural properties, surface reactivity and catalytic pathway of ternary CuO-ZnO-CeO2 systems, shedding light on the structure-activity relationships. Thus, a series of CuZnCeO2 catalysts, at different CuO/CeO2 ratio (i.e. 0.2-1.2) were performed in the CO2 hydrogenation reactions at 20 bar and 200-300 °C, (GHSV of 4800 STP L∙kg∙cat-1∙h-1). Catalysts were characterized by several techniques including X-ray Diffraction (XRD), N2-physisorption, single-pulse N2O titrations, X-ray Photoelectron Spectroscopy (XPS), and Temperature-programmed Reduction with H2 (H2-TPR). Depending on preparation method, the results clearly diagnostics the occurrence of synergistic structural-electronic effects of cerium oxide on copper activity, with an optimal 0.5 copper-to-cerium content. The rise of CuO loading up to 30% drives to a considerable increase of hydrogenation activity: C2Z1-C catalyst obtains the best catalytic performance, reaching methanol yield value of 12% at 300 °C. Catalyst activity proceeds according to volcano-shaped relationships, in agreement with a dual sites mechanism. Copyright © 2020 BCREC Group. All rights reserved


Keywords: Renewable energy; hydrogen-to-liquid-fuels (HTL); carbon dioxide recycling; methanol synthesis and synfuels

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