Catalyst activity evaluation

Coking and Decoking Experiments. Coking and decoking experiments were performed using either the microreactor used for catalyst activity evaluation or the catalyst accelerated deterioration testing system for various types of feeds or under various regeneration conditions. 

Catalytic experiments were done with 75 ml of a catalyst and FAV=10 000 m /h/kgcat-Combustion of toluene was chosen as a model volatile organic compound and non-steady-state reaction condition (linear increase 3.5 °C/min in reaction temperature) was applied in the catalyst activity evaluation. Concentration of toluene in air was 1 g /m. Temperatures of gaseous reaction mixture entering and leaving the catalyst layer were measured by thermocouples. Catalytic activities expressed as the inlet temperatures Tso or T90, at which 50 or 90 % conversions of toluene were achieved, were taken as a measure of the catalytic activity. 

Equations 6 9 can be easily applied in the case of catalyst activity evaluation using model gas reactors, because then the composition of the hydrocarbon C ,H is exactly known. In the case of engine exhaust gas, a weighted average of the exhaust gas hydrocarbon composition can be used. More detailed procedures, that also take the fuel eomposition into consideration, can be found in the literature [14],... 

Electrochemical Methods for Catalyst Activity Evaluation 597 11.8.2.2 Measurement of Fuel Crossover Rate... 

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