Paper Title
Study of the Reaction Mechanisms of Benzaldehyde Hydrogenation over Cu-Fe-LDH Like-Hydrotalcite and Derived Mixed Oxides

Abstract
The catalytic activity Cu-Fe-LDH hydrotalite-like compound and their precursors calcined as heterogeneous catalyst was investigated at atmospheric pressure in the gaseous phase benzaldehyde hydrogenation. Hydrotalcite precursor Cu-Fe-LDH was prepared by co-precipitation method with Cu2+/Fe3+ molar ratio of ~ 2 at pH=10 using carbonates as an interlayer anions and Cu/Fe-HT mixed oxides were prepared by calcinations of Cu-Fe-LDH at different temperatures (400, 600 and 800°C). The catalytic performance of catalysts sensitive on both reaction temperature and the nature of oxides formed after the heat-treatment. The maximum of conversion was observed at 200°C for Cu-Fe-800, such high catalytic efficiency could reasonably be attributed to the presence of both Cu2+ and Fe3+ ions in the octahedral sites of the ferrite sub-lattice and active metallic copper species, which controlled the key to hydrogenation related to the adsorption of benzaldehyde molecules and following activation of carbonyl groups and the dissociation of hydrogen. Keywords: Hydrotalcite; Copper; Iron; Hydrogenation; Benzaldehyde; Benzyl alcohol.