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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
EN
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| URI: | http://purl.tuc.gr/dl/dias/2700E6D8-A447-4C6C-BA09-43D0090F7397 | ||
| Year | 2017 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | J. Díez-Ramírez, P. Sánchez, V. Kyriakou, S. Zafeiratos, G. E. Marnellos, M. Konsolakis and F. Dorado, "Effect of support nature on the cobalt-catalyzed CO2 hydrogenation," J. CO2 Util., vol. 21, pp. 562-571, Oct. 2017. doi: 10.1016/j.jcou.2017.08.019 https://doi.org/10.1016/j.jcou.2017.08.019 | ||
| Appears in Collections |
CO2 hydrogenation to value added chemicals/fuels has gained considerable interest, in terms of sustainable energy and environmental mitigation. In this regard, the present work aims to investigate the CO2 methanation performance of cobalt-based catalysts supported on different metal oxides (MxOy: CeO2, ZrO2, Gd2O3, ZnO) at low temperatures (200-300 °C) and under atmospheric pressure. Various characterization methods, such as N2 adsorption-desorption at -196 °C, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR), were employed to correlate the structural and surface properties of the materials with their catalytic activity. The results revealed a significant impact of support nature on the CO2 hydrogenation performance. The following order, in terms of CH4 yield (YCH4), was recorded at 300 °C: Co/CeO2 (∼96%) > Co/ZnO (∼54%) > Co/G2O3 (∼53%) ∼ Co/ZrO2 (∼53%). On the basis of the characterization results, the superiority of Co/CeO2 catalyst can be mainly ascribed to its enhanced reducibility linked to Co-Ceria interactions. Moreover, Co/CeO2 demonstrated a stable conversion/selectivity performance under subsequent reaction cycles, in contrast to Co/ZnO, which progressively activated under reaction conditions. The latter is related with the modifications induced in elemental chemical states and surface composition of Co/ZnO upon pretreatment in reaction conditions, in contrast to Co/CeO2 sample where a stable surface performance was observed.
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