IR, TPR and chemisorption study of alumina-supported cobalt catalysts

Decomposition of cobalt nitrate on alumina in air or hydrogen leads to the formation of different cobalt oxide phases. Chemisorption of Hz and IR spectra of adsorbed CO show that for the catalyst pretreated in H-2 the reduction to metallic cobalt occurs at T>573 K and results in lower metal dispersity. Formation of cobalt particles of different surface structures is proposed depending on the pretreatment mode.