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2019•Comptes Rendus ChimieOpen access

Improved Cu- and Zn-based catalysts for CO2 hydrogenation to methanol

Djaouida Allam, Simona M. Bennici, Lionel Limousy, Smaïn Hocine

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Abstract

In this study the influence of metal dispersion, spinel formation, and surface properties of binary and ternary catalysts (CuO CeO 2 , ZnO CeO 2 , CuO ZnO CeO 2 , and CuO ZnO Al 2 O 3 ) was evaluated. The catalysts prepared by polyol method using polyethylene glycol as a solvent have been tested in the CO 2 hydrogenation to methanol performed at atmospheric pressure. The catalysts prepared by polyol method presented improved properties in terms of metal oxide dispersion, morphology (i.e. sponge-like shape for the CeO 2 -containing catalysts), and a large variety of metal and metal oxide species on the surface. Moreover, the CuO ZnO CeO 2 and CuO ZnO Al 2 O 3 catalysts exhibited a higher activity and selectivity in the methanol synthesis by CO 2 hydrogenation than those displayed by catalysts prepared by more conventional methods.

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In this study the influence of metal dispersion, spinel formation, and surface properties of binary and ternary catalysts (CuO CeO 2 , ZnO CeO 2 , CuO ZnO CeO 2 , and CuO ZnO Al 2 O 3 ) was evaluated. The catalysts prepared by polyol method using polyethylene glycol as a solvent have been tested in the CO 2 hydrogenation to methanol performed at atmospheric pressure. The catalysts prepared by polyol method presented improved properties in terms of metal oxide dispersion, morphology (i.e. sponge-like shape for the CeO 2 -containing catalysts), and a large variety of metal and metal oxide species on the surface. Moreover, the CuO ZnO CeO 2 and CuO ZnO Al 2 O 3 catalysts exhibited a higher activity and selectivity in the methanol synthesis by CO 2 hydrogenation than those displayed by catalysts prepared by more conventional methods.

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Available abstract

In this study the influence of metal dispersion, spinel formation, and surface properties of binary and ternary catalysts (CuO CeO 2 , ZnO CeO 2 , CuO ZnO CeO 2 , and CuO ZnO Al 2 O 3 ) was evaluated. The catalysts prepared by polyol method using polyethylene glycol as a solvent have been tested in the CO 2 hydrogenation to methanol performed at atmospheric pressure. The catalysts prepared by polyol method presented improved properties in terms of metal oxide dispersion, morphology (i.e. sponge-like shape for the CeO 2 -containing catalysts), and a large variety of metal and metal oxide species on the surface. Moreover, the CuO ZnO CeO 2 and CuO ZnO Al 2 O 3 catalysts exhibited a higher activity and selectivity in the methanol synthesis by CO 2 hydrogenation than those displayed by catalysts prepared by more conventional methods.

Key concepts: Polyol, Chemistry, Catalysis, Methanol, Metal, Polymer chemistry, Nuclear chemistry, Dispersion (optics)

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