Evaluation of In-Service Properties and Life Time of Automotive Catalyst Support Materials

摘要

Support materials play a key role in the manufacturing and operation of catalytic converters. In the present work, an attempt was made to correlate macroscopic mechanical and chemical properties to the microstructure of support materials. It was shown that under service conditions, which means cyclic compression and decompression, microstructural processes lead to a reduced relaxed pressure. Manufacturing parameters have to be adapted correspondingly. Significant differences between intumescent and non-intumescent support materials with respect to erosion and corrosion resistance were observed. A more detailed examination of the microstructure-property relationship, with a focus on the relaxation phenomena and high temperature aging, is in progress.