Regeneration Study on Active Components Supplement of Waste V۲O۵-WO۳/TiO۲ SCR Catalyst

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 ۹۸.۳۶% at optimal regeneration parameters of ۶% WO۳ loaded after ۱.۲% V۲O۵ loaded and then calcined at ۵۰۰ oC. The catalysts were characterized by XRD and H۲-TPR techniques. The XRD patterns and the FT-IR spectrogram showed that the supplemented V۲O۵ and WO۳ were dispersed uniformly in an amorphous state on the surface of TiO۲ support which remained as the anatase phase. The H۲-TPR characterization reported that V۲O۵ significantly affected the low-temperature activity while WO۳ mainly affected the high-temperature activity, the loading sequence of V۲O۵ before WO۳ not only enhanced the interaction between V۲O۵ and TiO۲ but also facilitated the enrichment of WO۳ on TiO۲ surface.

کلیدواژه ها:

SCR catalyst ، Deactivation ، regeneration ، the orthogonal design