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. 2022 Dec 2:10:101955.
doi: 10.1016/j.mex.2022.101955. eCollection 2023.

Clay exfoliation method as a route to obtain mesoporous catalysts for CO2 methanation

Daniel Cortés-Murillo  1 , Carolina Blanco-Jiménez  1 , Carlos E Daza  1
Affiliations

Clay exfoliation method as a route to obtain mesoporous catalysts for CO2 methanation

Daniel Cortés-Murillo et al. MethodsX. .

Abstract

A unique method for obtaining a mesoporous catalytic support through the exfoliation of a montmorillonite is reported. This method consisted of the intercalation of Na-clay with Al-Keggin species and polyvinyl alcohol followed by microwave irradiation. The mesoporous support was employed to prepare Ni-catalysts which were used in the natural gas synthesis through CO2 methanation. The synthesis method was validated confirming the clay exfoliation and the main formation of mesopores. Also, the Ni-catalysts have mainly weak basic surface properties lower than 38 µmol.g-1, and containing Ni0 nanoparticles with sizes between 9 and 12 nm which were thermally stable after reduction and methanation reaction. The catalyst with 5% Ni wt. gave conversions between 50 and 80% with temperatures ranging from 200 to 300 °C and selectivities of 100% towards the formation of CH4 without coke formation. The (3 and 5% Ni) Ni-catalysts are stable up to 8 h at 400 °C in the methanation reaction maintaining 100% of selectivity.•Mesoporous catalytic supports are obtained through a unique clay exfoliation method (Al-keggin, PVA, and microwaves).•(3% and 5% wt.) Ni-mesoporous catalysts are thermally stable and Ni0 nanoparticles between 9 and 12 nm are achieved.•5%wt. Ni-catalyst have no deactivation up to 8 h at 400 °C and displays unprecedented performance at low temperatures in CO2-methanation with 100% of selectivity.

Keywords: Climate change; Exfoliated clay; Mesoporous materials; Microwave-assisted clay exfoliation; Synthetic natural gas.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Image, graphical abstract
Graphical abstract
Fig 1
Fig. 1
Step by step of clay exfoliation method.
Fig 2
Fig. 2
Powder XRD for A. Natural Na-clay and B. Exfoliated clay.
Fig 3
Fig. 3
A. XRD for catalysts, B. H2-TPR, C. XRD for reduced catalysts at 600°C, D. XRD for spent catalysts, E. CO2-TPD, and selected SEM images for catalysts.
Fig 4
Fig. 4
TEM selected images and Ni0 particle distributions for (left) 3% Ni and (right) 5% Ni.
Fig 5
Fig. 5
CO2 conversions and CH4 selectivity in the CO2 methanation reaction. CO2/H2/He 10/40/50%vol. and WHSV=52400 mL.(g.h)−1
Fig 6
Fig. 6
Stability tests for catalysts at 400°C. CO2/H2/He 10/40/50%vol. and WHSV=52400 mL.(g.h)−1
See this image and copyright information in PMC

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