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      CO 2 Hydrogenation over Nanoceria-Supported Transition Metal Catalysts: Role of Ceria Morphology (Nanorods versus Nanocubes) and Active Phase Nature (Co versus Cu)

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          Abstract

          In this work we report on the combined impact of active phase nature (M: Co or Cu) and ceria nanoparticles support morphology (nanorods (NR) or nanocubes (NC)) on the physicochemical characteristics and CO 2 hydrogenation performance of M/CeO 2 composites at atmospheric pressure. It was found that CO 2 conversion followed the order: Co/CeO 2 > Cu/CeO 2 > CeO 2, independently of the support morphology. Co/CeO 2 catalysts demonstrated the highest CO 2 conversion (92% at 450 °C), accompanied by 93% CH 4 selectivity. On the other hand, Cu/CeO 2 samples were very selective for CO production, exhibiting 52% CO 2 conversion and 95% CO selectivity at 380 °C. The results obtained in a wide range of H 2:CO 2 ratios (1–9) and temperatures (200–500 °C) are reaching in both cases the corresponding thermodynamic equilibrium conversions, revealing the superiority of Co- and Cu-based samples in methanation and reverse water-gas shift (rWGS) reactions, respectively. Moreover, samples supported on ceria nanocubes exhibited higher specific activity (µmol CO 2·m −2·s −1) compared to samples of rod-like shape, disclosing the significant role of support morphology, besides that of metal nature (Co or Cu). Results are interpreted on the basis of different textural and redox properties of as-prepared samples in conjunction to the different impact of metal entity (Co or Cu) on CO 2 hydrogenation process.

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          Recent advances in catalytic hydrogenation of carbon dioxide.

          Wei-wei Wang, Shengping Wang, Xinbin Ma … (2011)
          Owing to the increasing emissions of carbon dioxide (CO(2)), human life and the ecological environment have been affected by global warming and climate changes. To mitigate the concentration of CO(2) in the atmosphere various strategies have been implemented such as separation, storage, and utilization of CO(2). Although it has been explored for many years, hydrogenation reaction, an important representative among chemical conversions of CO(2), offers challenging opportunities for sustainable development in energy and the environment. Indeed, the hydrogenation of CO(2) not only reduces the increasing CO(2) buildup but also produces fuels and chemicals. In this critical review we discuss recent developments in this area, with emphases on catalytic reactivity, reactor innovation, and reaction mechanism. We also provide an overview regarding the challenges and opportunities for future research in the field (319 references).
          Article 0 comments Cited 710 times – based on 0 reviews     Review now
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            Fundamentals and Catalytic Applications of CeO2-Based Materials.

            Tiziano Montini, Michele Melchionna, Matteo Monai … (2016)
            Cerium dioxide (CeO2, ceria) is becoming an ubiquitous constituent in catalytic systems for a variety of applications. 2016 sees the 40(th) anniversary since ceria was first employed by Ford Motor Company as an oxygen storage component in car converters, to become in the years since its inception an irreplaceable component in three-way catalysts (TWCs). Apart from this well-established use, ceria is looming as a catalyst component for a wide range of catalytic applications. For some of these, such as fuel cells, CeO2-based materials have almost reached the market stage, while for some other catalytic reactions, such as reforming processes, photocatalysis, water-gas shift reaction, thermochemical water splitting, and organic reactions, ceria is emerging as a unique material, holding great promise for future market breakthroughs. While much knowledge about the fundamental characteristics of CeO2-based materials has already been acquired, new characterization techniques and powerful theoretical methods are deepening our understanding of these materials, helping us to predict their behavior and application potential. This review has a wide view on all those aspects related to ceria which promise to produce an important impact on our life, encompassing fundamental knowledge of CeO2 and its properties, characterization toolbox, emerging features, theoretical studies, and all the catalytic applications, organized by their degree of establishment on the market.
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              Renewable Power-to-Gas: A technological and economic review

              Manuel Götz, Jonathan Lefebvre, Friedemann Mörs … (2016)
              Article 0 comments Cited 374 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Nanomaterials (Basel)
                Journal ID (iso-abbrev): Nanomaterials (Basel)
                Journal ID (publisher-id): nanomaterials
                Title: Nanomaterials
                Publisher: MDPI
                ISSN (Electronic): 2079-4991
                Publication date (Electronic): 06 December 2019
                Publication date Collection: December 2019
                Volume: 9
                Issue: 12
                Electronic Location Identifier: 1739
                Affiliations
                [1 ]School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Greece; mlykaki@ 123456isc.tuc.gr (M.L.); sstefa@ 123456isc.tuc.gr (S.S.)
                [2 ]Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal
                [3 ]Department of Mechanical Engineering, University of Western Macedonia, GR-50100 Kozani, Greece; georgios.varvoutis@ 123456gmail.com (G.V.); lpapista@ 123456gmail.com (E.P.); gmarnellos@ 123456uowm.gr (G.E.M.)
                [4 ]Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas, GR-57001 Thermi, Thessaloniki, Greece
                Author notes
                [* ]Correspondence: mkonsol@ 123456pem.tuc.gr ; Tel.: +30-28210-37682
                Author information
                https://orcid.org/0000-0002-2898-5986
                https://orcid.org/0000-0001-9913-4671
                https://orcid.org/0000-0003-4174-4455
                Article
                Publisher ID: nanomaterials-09-01739
                DOI: 10.3390/nano9121739
                PMC ID: 6955880
                PubMed ID: 31817667
                SO-VID: e8f0fbcf-0e27-4220-a51c-16138aac06a5
                Copyright © © 2019 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. 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/).

                History
                Date received : 04 November 2019
                Date accepted : 02 December 2019
                Categories
                Subject: Article

                Keywords: co2 hydrogenation,copper,cobalt,nanoceria,reverse water-gas shift reaction,methanation (sabatier) reaction
                Data availability:
                Keywords: co2 hydrogenation, copper, cobalt, nanoceria, reverse water-gas shift reaction, methanation (sabatier) reaction

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