Resumo

EL-MOLLA, Sahar A. et al. Catalytic Properties of Pure and K⁺-Doped CuO/MgO System Towards 2-Propanol Conversion. J. Mex. Chem. Soc [online]. 2013, vol.57, n.1, pp.36-42. ISSN 1870-249X.

CuO/MgO system having different compositions was prepared by impregnation method followed by calcination at 400-900 °C. The effect of CuO content, calcination temperature and doping with small amounts of K⁺ species (1-3 mol %) on physicochemical, surface and catalytic properties of the system were investigated using XRD, adsorption of N₂ at −196 °C, and conversion of isopropyl alcohol at 150-400 °C using a flow technique. The results revealed that the solids having the formulae 0.2 and 0.3 CuO/MgO calcined at 400 °C consisted of nanosized MgO and CuO as major phases together with Cu₂O as minor phase. The BET-surface areas of different adsorbents are decreased by increasing CuO content, calcination temperature and K⁺-doping. MgO-support material showed very small catalytic activity in 2-propanol conversion. The investigated system behaved as selective catalyst for dehydrogenation of 2-propanol with selectivity > 80%. The catalytic activity increased by increasing CuO content and decreased by increasing the calcination temperature within 400-900 °C. K⁺-doping increased the catalytic activity and catalytic durability.

Palavras-chave : CuO/MgO; K⁺-doping; Catalytic Activity; Selectivity; Durability.