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3D printed Ni/Al2O3 based catalysts for CO2 methanation - a comparative and operando XRD-CT study

Middelkoop, V; Vamvakeros, A; De Wit, D; Jacques, SDM; Danaci, S; Jacquot, C; De Vos, Y; ... Beale, AM; + view all (2019) 3D printed Ni/Al2O3 based catalysts for CO2 methanation - a comparative and operando XRD-CT study. Journal of CO2 Utilization , 33 pp. 478-487. 10.1016/j.jcou.2019.07.013. Green open access

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Abstract

Ni-alumina-based catalysts were directly 3D printed into highly adaptable monolithic/multi-channel systems and evaluated for CO2 methanation. By employing emerging 3D printing technologies for catalytic reactor design such as 3D fibre deposition (also referred to as direct write or microextrusion), we developed optimised techniques for tailoring both the support's macro-and microstructure, as well as its active particle precursor distribution. A comparison was made between 3D printed commercial catalysts, Ni-alumina based catalysts and their conventional counterpart, packed beds of beads and pellet. Excellent CO2 conversions and selectivity to methane were achieved for the 3D printed commercial catalyst (95.75% and 95.63% respectively) with stability of over 100h. The structure-activity relationship of both the commercial and in-house 3D printed catalysts was explored under typical conditions for CO2 hydrogenation to CH4, using operando 'chemical imaging', namely X-Ray Diffraction Computed Tomography (XRD-CT). The 3D printed commercial catalyst showed a more homogenous distribution of the active Ni species compared to the in-house prepared catalyst. For the first time, the results from these comparative characterisation studies gave detailed insight into the fidelity of the direct printing method, revealing the spatial variation in physico-chemical properties (such as phase and size) under operating conditions.

Type: Article
Title: 3D printed Ni/Al2O3 based catalysts for CO2 methanation - a comparative and operando XRD-CT study
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jcou.2019.07.013
Publisher version: https://doi.org/10.1016/j.jcou.2019.07.013
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: CO2 methanation, Ni/Al2O3 catalyst, structured catalysts, 3D printed catalysts, operando in-situ XRD-CT
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/10081626
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