Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Abstract

A (Co,Mn)(Co,Mn)2O4/MgO catalyst was prepared by simple co-precipitation from an aqueous solution of the mixed metal salts using sodium carbonate. The calcination of the precipitate was characterized by TGA and XRD showing the generation of (Co,Mn)(Co,Mn)2O4/MgO by 773 K. The catalyst had a surface area of 45 m2 g−1 in the fully calcined state (873 K) and was characterized by XRD and TGA. Characterization by TPR of the catalyst calcined at different temperatures revealed an annealing process that lowered the surface energy of the catalyst thereby inhibiting reduction. The calcined catalyst was active for the dehydrogenation of isopropanol to acetone and propene with the peak reaction temperature ~428 K and a second reaction zone around 613 K related to strongly bound alcohol. Lattice oxygen was reactive from 463 K converting adsorbed alcohol into carbon dioxide.