Abstract. Structural changes of a commercial supported PdAu/SiO2 catalyst for VAM production aged under laboratory and industrial conditions were studied by XRD, TEM/EDXS, XPS, ICP-OES and FTIR spectroscopy. The fresh catalyst contains alloy particles with a wide range of Pd/Au ratios formed by agglomerated crystallites of different sizes. The particles do not show any noticeable sintering …
Abstract. The gas phase hydrogenation of acrolein over supported silver catalysts has been investigated with a focus on the influence of the support acidity. Acidity has been varied by preparing silver catalysts supported on silica/alumina supports with varying SiO2/Al2O3 ratio. After the catalytic experiments the Ag catalysts exhibit similar particle sizes, as revealed with TEM (transmissi…