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Understanding structure-activity relationships in highly active La promoted Ni catalysts for CO₂ methanation

Ho, PH; de Luna, GS; Angelucci, S; Canciani, A; Jones, W; Decarolis, D; Ospitali, F; ... Benito, P; + view all (2020) Understanding structure-activity relationships in highly active La promoted Ni catalysts for CO₂ methanation. Applied Catalysis B: Environmental , Article 119256. 10.1016/j.apcatb.2020.119256. (In press).

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Abstract

Ni-based catalysts are selective in the hydrogenation of CO_{2} to CH_{4} but their activity and stability need improvement. Herein, we propose a hydrotalcite-derived high loaded Ni-Al_{2}O_{3} catalyst promoted by La. The effect of La on the catalyst properties is investigated and compared with that of Y and Ce. The NiO_{x} rystallite size and basic properties (rather than the nickel reducibility) as well as the catalytic activity depend on the rare-earth element. The La-catalyst achieves a more relevant activity enhancement at low temperature and high space velocity (480 L g^{-1} h^{-1}, CO_{2}/H_{2}/N_{2} = 1/4/1 v/v), high CH_{4} productivity (101 L_{CH4} gNi^{-1} h^{-1}) and stability, even under undiluted feeds. In situ DRIFTS and the characterization of spent catalysts confirm that this enhanced performance is related to the combination of dissociative and associative CO_{2} activation on more reduced, highly dispersed and stable Ni nanoparticles and basic sites in the La_{2}O_{3}-Al_{2}O_{3} matrix, respectively.

Type: Article
Title: Understanding structure-activity relationships in highly active La promoted Ni catalysts for CO₂ methanation
DOI: 10.1016/j.apcatb.2020.119256
Publisher version: https://doi.org/10.1016/j.apcatb.2020.119256
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Nickel, Lanthanum, hydrotalcite, CO_{2} methanation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10102535
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