| Author(s) | E. A. El-Sharkawy* and Shar S. Al-Shihry |
| Affiliation | Department of Chemistry, College of Science P.O. Box 1759, King Faisal University Hofuf 31982, Eastern Province, Saudi Arabia |
| Title | Dehydration-dehydrogenation Activities of 2-Propanol over Fe2O3 / TiO2 Catalysts: Effect of Li+ Impregnation |
| Source | Journal of King Saud University. Science. Volume 16, No 2. (2004/1424) |
| Abstract | . Fe2O3/TiO2 binary solid catalysts containing 1-35 wt.% Fe were prepared by impregnating TiO2 with Fe (NO3)3 at 333K, followed by, drying and calcination at 873K. Li impregnated Fe2O3 / TiO2 samples containing 1-10 wt.% Li was also prepared followed the same procedure. The textural properties were determined from the low temperature adsorption of nitrogen at 77K. The structural characteristics of pre-calcined samples were examined by using various techniques, including, X-ray diffraction (XRD), differential thermal analysis (DTA), thermal gravimetric analysis (TGA) and ESR techniques. The determination of surface acidity was performed by the adsorption of n-butyl amine in non-aqueous media. The catalytic conversion of 2-propanol as well as the reaction kinetics was performed using the microcatalytic pulse technique. The measurable textural parameters including surface area and the total pore volume decreased continuously by increasing % loading of Fe or Li. XRD technique revealed that TiO2, Fe2O3, TiFe2O4 and Li2Fe2O4 typical spinels were assigned. ESR shows the presence of ferric iron (III) belonging to iron oxide and iron spinel. Regarding with surface acidity, it was found that the values of acid amount increased with the increases of % Fe loading, while the addition of Li exhibits an opposite behavior. The catalytic activity was influenced to more or less extent by the %loading of iron and/or Li-oxides and also by surface acidity of the investigated catalysts. |
