Regeneration study on active components supplement of waste V2O5-WO3/TiO2 SCR catalyst

Abstract

The waste selective catalytic reduction (SCR) catalysts were regenerated by active components supplement on the basis of alkali/acid washing treatment. Through orthogonal design, the regenerated SCR catalyst restored the denitration activity of 98.36% at optimal regeneration parameters of 6% WO3 loaded after 1.2% V2O5 loaded and then calcined at 500 oC. The catalysts were characterized by XRD and H2-TPR techniques. The XRD patterns and the FT-IR spectrogram showed that the supplemented V2O5 and WO3 were dispersed uniformly in amorphous state on the surface of TiO2 support which remained as anatase phase. The H2-TPR characterization reported that V2O5 significantly affected on the low-temperature activity while WO3 mainly affected the high-temperature activity, the loading sequence of V2O5 before WO3 not only enhanced the interaction between V2O5 and TiO2 but also facilitated the enrichment of WO3 on TiO2 surface.