PASCA ANALYSIS OF PT-MORDENITE-AL2O3 CATALYSTS

Positron annihilation spectroscopy for chemical analysis (PASCA) has b een applied to differentiate a multicomponent system from the individu al constituents. The model catalysts used for this study were a Pt ion exchanged with mordenite and then extruded with Al2O3 and Pt impregna ted onto a formed mordenite-Al2O9 extrudate. Differences were observed between the extrudates and mixed blends of the individual components. This result suggests that the extrusion may modify the location or in teraction of the Pt and that PASCA has potential for the characterizat ion of multicomponent catalysts.