Formation of the Active Surface of Ag/SiO2 Catalysts in the Presence of FeOx Additives

Supported FeOx-modified silver catalysts based on commercial silica gel and prepared via impregnation with a solution of Fe- and Ag-containing salts while varying the amount of modifier from 1 to 10 wt % are studied. It is found that the introduction of Fe-containing compounds leads to the distribution of silver in the form of clusters/ions on the surface of SiO2, improving the reducibility of the systems in the H-2 TPR mode. After reduction at 800 degrees C, the catalysts containing 10 wt % iron and 5 wt % silver comprise a Fe2SiO4 iron silicate phase.