Regeneration of the deactivated TiO2-ZrO2-CeO2/ATS catalyst for NH3-SCR of NOx in glass furnace

Larger amounts of alkalis, alkali earth metals and sulfides in flue gas from glass furnace were easier to deactivate selective catalytic reduction (SCR) catalyst compared to the flue gases from other stationary sources. Catalyst regeneration has been an emerging research topic for flue gas denitrification in glass furnace. Regeneration of the deactivated TiO2-ZrO2-CeO2/Al2TiO5-TiO2-SiO2 (ATS) complex phase ceramics catalysts used for NH3-SCR of NOx in glass furnace was studied in this work. Effects of regeneration methods, including washing with different aqueous solutions and sulfuric acid, thermal regeneration, thermal reduction regeneration, and thermal regeneration with SO2, on catalytic performance were comparatively investigated. In comparison of catalytic activities between the catalysts before and after regeneration, results showed that washing was the most effective regeneration method, and the sulfuric acid concentration of the washing solution was an important factor. Washing time directly affected catalyst regeneration efficiency and catalyst life. The regenerated TiO2-ZrO2-CeO2/ATS catalyst regained more than 90% NO conversion after being washed with 10 wt.% H2SO4 for 30 min.