Study of synthesis and catalytic property of WO3/TiO2 catalysts for NO reduction at high temperatures

In this study, a series of WO3-m%/TiO2 samples were successfully prepared via a simple and effective sol–gel method, which were subsequently used for the NO reduction by NH3 in the temperature range of 350–600 °C. Structural, morphological, and BET analysis revealed that the WO3 species were dispersed evenly into titania matrix so that the samples only exhibited anatase phase with high surface area. SCR results proved that the WO3/TiO2 catalysts exhibited good catalytic properties for the NO reduction at high temperatures. The correlated relationship between compositions, temperatures and structures for WO3/TiO2 catalytic mechanism was also discussed.

Graphical abstractWe report that WO3/TiO2 catalysts via the sol–gel method exhibited good catalytic properties for SCR of NO reduction by NH3 over 500 °C.Figure optionsDownload full-size imageDownload high-quality image (115 K)Download as PowerPoint slideHighlights► A series of WO3-m%/TiO2 samples were fabricated via a simple sol–gel method. ► Catalysts with WO3 loading of 25% exhibited good catalytic properties over 500 °C. ► The isolate and dimeric tetrahedrally WOx play a major role for the SCR reaction. ► The acidity is not a major factor for the SCR performance at high temperatures.