Regeneration of Selective Catalyst Reduction Catalysts Deactivated by Pb, As, and Alkali Metals

[Image: see text] Owing to increased operating time and Pb, As, and alkali metal poisoning of a catalyst, the activity of the catalyst is lowered. In the present study, we utilized the acetic acid and the traditional sulfuric acid pickling process for regeneration and then performed Brunauer–Emmett–Teller (BET) specific surface area, denitrification efficiency, scanning electron microscopy, and X-ray fluorescence (XRF) analysis of a fresh catalyst, a deactivated catalyst, and a regenerated catalyst for comparison purposes. The experimental results demonstrated that the removal ratios of Pb, As, Na, and K were 99.2, 98.8, 99.9, and 93.9%, respectively. Compared to the traditional sulfuric acid regeneration technology, the acetic acid regeneration technology eliminates the activated liquid immersion step; therefore, the steps are simpler and efficient for the regeneration of selective catalyst reduction catalysts deactivated by Pb, As, and alkali. The current study provides a new method for the regeneration and application of selective catalyst reduction (SCR) catalysts, which is particularly applicable for regenerating a large number of Pb, As, and alkali-metal poisoned catalysts.