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Ni/silica-based bimetallic catalysts by solid-state co-reduction of admixed metal oxides for acetic acid hydroconversion to ethanol

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Abstract

Consecutive reduction of acetic acid to ethanol was investigated looking for advantageous bimetallic catalysts for the processing of volatile fatty acids that can be produced by thermochemical or biological biomass degradation. The reactant acid was hydrotreated in a flow-through reactor at 21 bar total pressure and 200–380 °C over fumed silica loaded with Ni main metal and Cu, Zn, Cd, Ga, In, Sn modifying metals. By varying these bimetallic composites prepared by solid-state co-reduction of admixed metal oxide precursors, the characteristic hydrodecarbonylation activity of nickel can be completely eliminated and a high ethanol yield can be attained selectively with the exception of Zn and Cd. The low boiling point and high volatility of these two elements in group IIb exclude formation of stable bimetallic composition. Indium and tin doping were found to be the most efficient. The lower reduction temperature of the In2O3 was found to be the advantage of novel In doping compared to well-known Sn-admission using oxide precursors for introduction of the second metal.

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Acknowledgments

The authors wish to express their appreciation to Mrs. Ágnes Farkas Wellisch for her technical assistance. Thanks is due to the Hungary-Slovakia Cross-border Co-operation Programme (Project registration number: HUSK/1101/1.2.1/0318) for supporting this research. Thanks to the European Union and the State of Hungary co-financed by the European Social Fund in the framework of TÁMOP 4.2.4. A/2-11-1-2012-0001 ‘National Excellence Program’ for the further support.

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  1. Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest, 1117, Hungary

    György Onyestyák

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  1. György Onyestyák
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Correspondence to György Onyestyák.

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Onyestyák, G. Ni/silica-based bimetallic catalysts by solid-state co-reduction of admixed metal oxides for acetic acid hydroconversion to ethanol. Res Chem Intermed 41, 9207–9215 (2015). https://doi.org/10.1007/s11164-015-1957-x

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  • DOI: https://doi.org/10.1007/s11164-015-1957-x

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