Catalytic Performance of Ti³⁺ Self-Doped V₂O₅-TiO₂ Catalysts for Selective Catalytic Reduction with NH₃

Abstract

Ti 3+ self-doping modified V 2 O 5 /TiO 2 catalyst was prepared by sol-gel and impregnation methods and used for selective catalytic reduction (SCR) of NO x with NH 3 . Results showed that Ti 3+ self-doped V 2 O 5 /TiO 2 catalyst performed the better catalytic activity. And X-ray diffraction and scanning electron microscopy were used to evaluate the phase composition and morphology of the prepared catalyst. The effects of calcinations temperature of the support, oxygen concentration, [NH 3 ]/[NO] molar ratio and the GHSV on the denitration performance were investigated. It was found that more than 80% NO x conversion was obtained at 210 ° C when the O 2 volume fraction was 5%, the NO concentration was 500 ppm, the [NH 3 ]/[NO] molar ratio = 1 and the GHSV was 23,885 h − 1 . The results showed that the catalytic activity increased first with the increasing of O 2 concentration and [NH 3 ]/[NO] molar ratio, then remained stable. At the same time, the stability of the catalyst was also studied at the temperature of 210 ° C. The reaction continued for 750 minutes, and the catalytic activity remained above 80%, indicating that the catalyst has a good stability. Moreover, the Ti 3+ self-doped V 2 O 5 /TiO 2 catalyst also showed good SO 2 and H 2 O resistance. Therefore, these findings provide important information to better understand the application of the prepared catalyst.