Abstract
Chromium–iron bulk mixed oxides were prepared by a sol–gel method using 2-propanol solutions of the nitrate salts of both metals, and propylene oxide as a gelation promoter. Composites with iron content of 10%, 50% and 90% were prepared and compared with the corresponding pure oxides, α-Fe 2O 3 and Cr 2O 3. The mixed oxides were characterized by XRD, TEM, FT-IR, and N 2 adsorption. The XRD analysis indicated the formation of solid solutions of the mixed oxides which exhibited significantly modified textural characteristics, as indicated by N 2 adsorption studies. The characteristics of the mixed oxides were dependent on the Cr/Fe ratio and the composite with 50% Fe, in particular, exhibited significantly higher specific surface areas and porosity than other composites and pure oxides. The catalytic conversion of methanol was studied at 225 °C. The catalytic activities exhibited by the mixed oxides were significantly higher than those of the pure oxides. The yields of the products, dimethyl ether (DME), methyl formate (MF), and CO 2 were dependent on the Cr/Fe ratio.
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