Twelve samples from field-aged catalyst were investigated. The conversion performance was measured in a model gas test. The samples taken from the inlet side of the monolith were more deactivated than the corresponding ones from the outlet. However, s...
Twelve samples from field-aged catalyst were investigated. The conversion performance was measured in a model gas test. The samples taken from the inlet side of the monolith were more deactivated than the corresponding ones from the outlet. However, samples taken from peripheral positions always showed better performance than samples originating from the center. In order to explain observed variations in activity the total surface area(B.E.T) and poisoning of each sample(EDS) were examined. It was concluded that thermal deactivation was mainly responsible for the difference between peripheral and central position while the poisoning due to S, Pb and P had the largest effect on the inlet samples.<br/>