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Issue 9, 2017
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Comparative study of three heteropolyacids supported on carbon materials as catalysts for ethylene production from bioethanol

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Abstract

The efficacy of three different heteropolyacids (HPAs) supported on activated carbon (AC) or on high surface area graphite (HSAG) has been comparatively evaluated in the dehydration of bio-ethanol to yield ethylene or diethyl ether. These supported heteropolyacid compounds exhibit remarkable catalytic performances for the ethanol conversion at relatively low reaction temperatures. Furthermore, taking into account the sensitivity of heteropolyacid structures to the presence of water, some catalytic tests with ethanol + water mixtures as the reactant feed have been performed, proving the stability of these composite materials under the used reaction conditions. Structural characterization of these materials has been accomplished by thermal gravimetric analysis coupled with differential thermal analysis (TGA-DTA) and by X-ray diffraction. The textural properties of the synthesized materials were determined from the nitrogen adsorption isotherms. Also, ammonia temperature programmed desorption was performed in order to evaluate the amount and strength of exposed acid surface sites. While phosphomolybdic acid is thermally unstable under the reaction conditions, supported tungstophosphoric and silicotungstic acids are stable under the reaction conditions even in the presence of water. These results are significant because these new carbon supported catalyst materials can be envisaged as highly promising candidates for the production of petrochemicals from bio-ethanol.

Graphical abstract: Comparative study of three heteropolyacids supported on carbon materials as catalysts for ethylene production from bioethanol

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Publication details

The article was received on 24 Jan 2017, accepted on 28 Mar 2017 and first published on 29 Mar 2017


Article type: Paper
DOI: 10.1039/C7CY00155J
Citation: Catal. Sci. Technol., 2017,7, 1892-1901
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    Comparative study of three heteropolyacids supported on carbon materials as catalysts for ethylene production from bioethanol

    M. Almohalla, I. Rodríguez-Ramos and A. Guerrero-Ruiz, Catal. Sci. Technol., 2017, 7, 1892
    DOI: 10.1039/C7CY00155J

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