Ageing Processes of Automotive 3-Way Catalyst Materials at High Temperatures in Sulphur-Bearing Oxidising Gases
This paper presents the results of a study concerned with the ageing characteristics of washcoated and non-coated cordierite catalysts under isothermal and thermal cycling conditions in air and air-SO(2). Thermogravimetric investigations were also carried out using actual catalyst materials as well as model substances of a caerium oxide and sulphate. These latter studies were aimed at the determination of sulphate formation and dissociation under oxidizing conditions in SO(2) containing environments. Weight change measurements and microstructural investigations revealed that during the long-term exposures, the non-coated carriers experienced no detectable damage. For the coated materials, however, the exposures lead to 2 types of structural change to the wash coat, namely cracking/spalling and sulphur uptake.
Bibliographic Reference: Paper presented: 4th International Symposium on HT Corrosion, Les Embiez (FR), May 1996
Availability: Available from (1) as Paper EN 39618 ORA
Record Number: 199610601 / Last updated on: 1996-05-27
Original language: en
Available languages: en