Reductive amination of 2-propanol to monoisopropylamine over Co/γ-Al2O3 catalysts
Co/γ-Al2O3 catalysts with 4–27 wt% cobalt loadings were prepared by incipient-wetness impregnation and used to catalyze the synthesis of monoisopropylamine by the reductive amination of 2-propanol in the presence of hydrogen and ammonia. The catalysts were characterized by X-ray diffraction, H2-temperature programmed reduction, N2-sorption, and H2-chemisorption. 23 wt% Co loading resulted in the highest catalytic activity and a long-term stability of up to 100 h on stream. 2-Propanol conversion was related to the exposed metal surface area and the number of exposed cobalt atoms. In the absence of hydrogen, the catalyst was progressively deactivated; its initial activity and selectivity were completely recovered upon re-exposure to hydrogen. The deactivation was due to the formation of metal nitride caused by the strong adsorption of ammonia on the surface of the metal phase. Excess hydrogen hindered the phase transition to metal nitride, preventing deactivation.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (94 K)Download as PowerPoint slideHighlights► Reductive amination of 2-propanol over Co/γ-Al2O3 catalysts. ► High yield in monoisopropylamine is controlled by the reaction parameters. ► The conversion of 2-propanol was correlated to the surface area of cobalt metal. ► Excess hydrogen could efficiently hinder the phase transition of catalyst.
Journal: Applied Catalysis A: General - Volumes 417–418, 29 February 2012, Pages 313–319