Effect of Ni, La, and Ce Oxides on a Cu/Al<sub>2</sub>O<sub>3</sub> Catalyst with Low Copper Loading for Ethanol Non‐oxidative Dehydrogenation
Gaukhar Yergaziyeva, К. Dossumov, Manshuk Mambetova, P. E. Strizhak, H. Kurokawa, Bedelzhan Baizhomartov
Abstract
Abstract The effect of modifying additives (Ni, La, Ce oxides) on the activity of Cu/Al 2 O 3 with a low copper loading was studied for ethanol non‐oxidative dehydrogenation. The catalysts were prepared by impregnation of the commercial Al 2 O 3 granules and characterized by Brunauer‐Emmett‐Teller (BET), scanning electron microscopy (SEM), temperature‐programmed desorption of NH 3 (TPD‐NH 3 ), temperature‐programmed reduction of H 2 (H 2 ‐TPR), and thermogravimetric analysis (TGA). Modification of Cu/Al 2 O 3 with Ni, La, and Ce oxides results in increasing catalytic activity. A modification of the Cu/Al 2 O 3 catalyst with nickel and lanthanum oxides, in contrast to cerium oxide, leads to an improvement in the dispersion of the catalyst particles. The Cu‐Ni/Al 2 O 3 catalyst with the highest acidity has the highest selectivity for acetaldehyde. The highest selectivity for butanol is observed for the Cu‐La/Al 2 O 3 catalyst, which has the lowest acidity.