Titanium Isopropoxide (TTIP) Treatment Strategy for V2O5-WO3/TiO2 SCR Catalysts with a Wide Operating Temperature

초록

Selective catalytic reduction (SCR) is the most effective method for reducing nitrogen oxide emissions, but the operating tem-perature range of V2O5-WO3/TiO2 catalysts is narrow (300-400 & DEG;C). In this study, a new catalyst with an operating temper-ature range of 200-450 & DEG;C was developed. The catalyst poison, ammonium bisulfate, generated during the SCR process can be removed by heating above 350 & DEG;C. To increase the number of active sites and promote the dispersion of active materials, titanium isopropoxide (TTIP) treatment was performed on the TiO2 support with various TTIP/TiO2 mass ratios. Among them, the 5 wt% TTIP loaded catalyst showed improved performance due to higher thermal stability caused by high W dispersion and the formation of V5+. In addition, the 5 wt% TTIP-loaded catalyst prepared by a one-step co-precipitation method showed greater V-OH and W-OH dispersion and enhanced interactions in contrast to conventional methods, resulting in higher cata-lytic activity at lower temperatures. This review article aims to provide an accessible explanation for researchers investigating how to improve the surface properties of TiO2 catalysts using TTIP.

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