Abstract
The influence of redox treatments on the state of palladium in the heteropoly acid K6[SiW11PdO39] supported on amorphous aluminosilicate was studied by diffuse-reflectance IR spectroscopy using CO as a probe molecule. A bulk sample of the K6[SiW11PdO39]·11H2O heteropoly compound (HPC) was studied for comparison. The deposition of the bulk sample on aluminosilicate leads to the partial decomposition of Keggin structure and to the removal of palladium cations from the HPC framework. The metal introduced into the K6[SiW11PdO39]/SiO2-Al2O3 system within HPC displays higher thermal stability in redox cycles compared to that of the bulk HPC. A highly dispersed state of palladium persists up to 573 K.
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