Study on Performance of Deactivated and Regenerated Catalysts for Coal-Fired Power Plant SCR Denitration

The activity and SO₂/SO₃ conversion rate of catalyst units are tested for the fresh, deactivated and regenerated SCR catalysts used in a thermal power plant by means of XRF, ICP, SEM-EDX, BET, Mercury Porosimeter and XRD. The test results show that the activity of used catalysts greatly decreases (from 41.5 m/h to 29.5 m/h). The causes of deactivation are analyzed and the catalyst regeneration process is designed. Compared with the fresh SCR catalysts, the activity of regenerated catalysts can be recovered to 99% of that of the fresh ones (from 29.5 m/h up to 41.1 m/h), the SO₂/SO₃ conversion rate is well controlled, and the microstructure and properties are basically the same.