Effect of CaO Modification on Performance of CuZnAlZr Catalyst in Synthesis of Higher Alcohols from Synthesis Gas

Abstract

CaO modified CuZnAlZr mixed oxide catalysts were prepared by mechanical mixing and co-precipitation methods, and their catalytic performances for CO hydrogenation to higher alcohols were investigated using a continuous flow high-pressure fixed-bed micro-reactor. The catalysts were characterized by X-ray diffraction (XRD), N 2 -adsorption-desorpotion, temperature-programmed reduction of H 2 (H 2 , and temperature-programmed desorption of CO 2 (CO 2 . The results showed that doping with CaO did not alter the textural properties of the catalyst, but increased the number of basic sites. Furthermore, the CaO-modified CuZnAlZr catalysts possessed both weak and medium strength basic sites, while unmodified CuZnAlZr catalyst possessed only weak basic sites. Catalytic performance, assessed by CO hydrogenation to C 2+ alcohols, was improved in the CaO-doped CuZnAlZr catalyst relative to the undoped catalyst. © Editorial office of Acta Physico-Chimica Sinica.