Operating Conditions and Composition Effect on the Hydrogenation of Carbon Dioxide Performed over CuO/ZnO/Al2O3 Catalysts

*Djaouida Allam -  Laboratoire de Chimie Appliquée et de Génie Chimique, Université M. Mammeri de Tizi-Ouzou, Algeria
Salem Cheknoun -  Laboratoire de Chimie Appliquée et de Génie Chimique, Université M. Mammeri de Tizi-Ouzou, Algeria
Smain Hocine -  Laboratoire de Chimie Appliquée et de Génie Chimique, Université M. Mammeri de Tizi-Ouzou, Algeria
Received: 20 Oct 2018; Revised: 2 Jul 2019; Accepted: 9 Jul 2019; Published: 1 Dec 2019; Available online: 30 Sep 2019.
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Abstract

A series of catalysts constituted of mixed copper and zinc oxides supported on alumina were prepared by co-precipitation method. The cooper content was in the 10-90 wt.% range. Their catalytic behavior in the hydrogenation of carbon dioxide to methanol was investigated at high pressure (up to 75 bars). The catalysts were characterized by elemental analysis, N2-adsorption, N2O-chemisorptions, and X-ray diffraction (XRD). The catalysts showed a clear activity in the hydrogenation reaction that could be correlated to the surface area of the metallic copper and to the reaction pressure. The CuO/ZnO/Al2O3 catalyst with a Cu/Zn/Al weight ratio of 60/30/10, exhibits the highest carbon dioxide conversion and methanol selectivity. Finally, a mechanism pathway has been proposed on copper active sites of (Cu0/CuI) oxidation state. Copyright © 2019 BCREC Group. All rights reserved

 

Keywords
carbon dioxide; hydrogenation; methanol; CuO/ZnO/Al2O3 catalysts

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