首页|Selective catalytic reduction of NOx by NH3 over V2O5-WO3 supported by titanium isopropoxide (TTIP)-treated TiO2
Selective catalytic reduction of NOx by NH3 over V2O5-WO3 supported by titanium isopropoxide (TTIP)-treated TiO2
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NSTL
Elsevier
? 2022Although the selective catalytic reduction (SCR) of NOx is the most effective way to reduce related emissions, the V2O5-WO3/TiO2 catalyst which is most used for this purpose has a narrow operation temperature range of 300–400 °C and, therefore, has limited applicability. Hence, better catalysts with more abundant active sites and a wider range of acceptable temperatures (240–450 °C) are required, especially because heating at ≥350 °C allows for removal of ammonium sulfate, a catalyst poison that is formed during SCR. Herein, we aim to produce such catalysts by treating the TiO2 support with titanium isopropoxide (TTIP) at several TTIP/TiO2 mass ratios, as this treatment is expected to increase the number of catalytically active sites and facilitate the dispersal of active materials. The optimal performance, which was observed for the catalyst prepared at a TTIP loading of 5 wt%, was ascribed to the increased thermal stability caused by the high extent of W dispersion and the formation of V4+ by the reaction of V5+ with surface Ti3+. Therefore, these results pave the way for the fabrication of more efficient NOx removal catalysts.
NSTL
Elsevier
