Prediction of Deactivation and Regeneration of DeNOx Catalyst Using Simple Reaction Model - 2nd Report : Modeling for Predicting Catalyst Regeneration and its Application

Abstract

 The SCR (selective catalytic reduction) DeNOx catalyst is deactivated when the exhaust gas contains SOx and the gas temperature is low. In this study, a simple reaction model for predicting DeNOx performance regeneration of deactivated vanadium-based commercial catalyst is developed to evaluate the effects of gas temperature, components, and DeNOx reaction in regeneration treatment. This model predicted the following: (1) When DeNOx reaction is not performed in regeneration treatment, low temperature (250 deg.) gas can regenerate the catalyst, and regeneration time is irrelevant to gas flow rate, NO, and SO₂. (2) When DeNOx reaction is performed in regeneration treatment, regeneration time is longer, and low temperature (less than 275 deg.) gas cannot regenerate catalyst perfectly. It is necessary to keep temperatures high (more than 300 deg.) to ensure regeneration.