Highly dispersed V2O5-WO3 in modified morphology of flower-like TiO2 for NH3-selective catalytic reduction over wide temperatures

Abstract

NOX, a first-class carcinogen, and secondary particulate matter are produced in Various industrial processes form stationary sources such as steel mills and thermal power plants. Selective catalytic reduction is a method of repeatedly exposing used as V2O5-WO3/TiO2 to high temperatures by used NH3 reduction agent to N2 and H2O. Consequently, the catalytic performance decreases during the aggregation of transition metal and support, and industries need catalysts that react in a wide temperature range. In this study, flower-type TiO2 (FL-Ti) that changes the morphology of TiO2 was synthesized through hydrothermal method, anatase TiO2 with a similar specific surface area to commercial TiO2 was synthesized, and the dispersibility of transition metals was increased. Synthesis was conducted by changing the ratio of commercial TiO2 to FL-Ti to increase economic efficiency and reduce aggregation of transition metal and TiO2, thus resulting in their high dispersion. The presence of Ti3+ in FL-Ti increased the hydroxyl group owing to increased Ti-O bonds and the V4+ ratio, which positively influenced the catalyst at low temperatures. The catalyst with added FL-Ti reacted with the Eley-Rideal mechanism. Additionally, NOX conversion and N2 selectivity were approximately 93-99% at temperatures ranging from 250-420 celcius.