Iron oxide and vanadium oxide monolayer catalysts have been made by reacting toluene solutions of the corresponding acetylacetonates with the surface OH groups of TiO2 or ZrO2. The product of the reaction, acetylacetone, competes with the acetonates for the adsorption sites. Of the four adsorption methods attempted, continuous adsorption and high-temperature adsorption gave approximately complete monolayers; the latter is the more promising method as it is more rapid and consumes fewer chemicals. TPR and CO-oxidation measurements for the Fe2O3-TiO 2 samples show that the monolayer is well-spread and that there is a signficant interaction with the support. The iron cannot be reduced beyond the Fell state, possibly due the formation of a surface ilmenite. The Fe 2O3 monolayers are less active for CO oxidation than is bulk Fe2O3 Impregnaton of TiO2 by Fe(NO 3) gives rise to small crystallites of Fe2O3 which have higher actvities for CO oxidation than do the monolayer materials.
|Number of pages||14|
|Journal||Studies in surface science and catalysis|
|Publication status||Published - 1987|
|Event||4th International Symposium on the Preparation of Catalysts 1986 - Louvain-Ia-Neuve, Belgium|
Duration: 1 Sep 1986 → 4 Sep 1986
Conference number: 4