HREM and XRD characterisation of thermal ageing of Pd/CeO_2/Al_2O_3 automotive catalysts

摘要

A Pd/CeO_2/Al_2O_3 catalyst is submitted to high temperature under oxidising, reducing and cycled oxidising/reducing feedstreams, and the activity of fresh and aged catalysts is analysed under simulated real consitions. The samples have been characterised by high resolution electron microscopy (HREM) and X-ray diffraction (XRD), and a correlation between the chemical structure of the catalyst and its catalytic behaviour is intended to be established.