Institutional Repository
Technical University of Crete
EN  |  EL

Search

Browse

My Space

Deciphering the role of Ni particle size and nickel-ceria interfacial perimeter in the low-temperature CO2 methanation reaction over remarkably active Ni/CeO2 nanorods

Varvoutis Georgios, Lykaki Maria, Stefa Sofia, Binas Vassilios, Marnellos, George, 19..-, Konsolakis Michail

Full record


URI: http://purl.tuc.gr/dl/dias/3A87F9E4-BA3C-4894-B68E-B102B404E550
Year 2021
Type of Item Peer-Reviewed Journal Publication
License
Details
Bibliographic Citation G. Varvoutis, M. Lykaki, S. Stefa, V. Binas, G. E. Marnellos, and M. Konsolakis, “Deciphering the role of Ni particle size and nickel-ceria interfacial perimeter in the low-temperature CO2 methanation reaction over remarkably active Ni/CeO2 nanorods,” Appl. Catal., B, vol. 297, Nov. 2021, doi: 10.1016/j.apcatb.2021.120401. https://doi.org/10.1016/j.apcatb.2021.120401
Appears in Collections

Summary

The structure sensitivity of CO2 methanation was explored over nickel particles (10–25 nm) supported on CeO2 nanorods. An optimum Ni particle size of 20 nm was revealed, with the corresponding sample demonstrating remarkable activity, i.e., 187 μmol CH4 g−1 s−1 and 92 % CH4 yield at 275 °C, which is among the highest ever reported. Notably, the intrinsic activity on the basis of the exposed Ni sites or Ni-ceria perimeter is largely independent of the Ni size, showcasing that neither the exposed Ni sites nor the Ni-ceria interface can be employed as activity descriptors. A compromise between the length of the metal-support perimeter and the competitive presence of larger Ni particles is necessary for the optimum activity. On the grounds of a structure-sensitivity analysis, the superior activity of larger Ni particles could be attributed to the presence of under-coordinated step and kink sites, instead of largely inactive terrace sites.

Services

Statistics