In order to apply SCR of NOx in mobile systems, which are characterized by transient operating conditions (changes in temperature and flow rate), an in-depth knowledge of the factors influencing the degree of NOx removal and the sorption effects of ammonia, used as reducing agent, on the catalyst is necessary. An extensive series of tests was carried out under steady-state and transient operating conditions, a commercially available catalytic converter based on vanadium pentoxide being used. The parameters investigated were the quantity of ammonia injected plus the exhaust gas temperature and flow rate. The discussion centers on the optimum operating mode for an SCR catalytic converter on the basis of the experimental results.


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