The Change of physicochemical properties on surface of V2O5-loaded TiO2 catalysts with different calcination temperatures prepared by the CVC and impregnation method

W.J. Cha, E.S. Park, M.S. Kim, S.M. Chin, Y.S. Kim, J.S. Jurng
KIST, KR

Keywords: V2O5/TiO2, calcination, chemical vapor condensation

Summary:

The aim of present research was to confirm the surface properties of V2O5-loaded TiO2 catalysts prepared by the CVC and impregnation method with different calcinations temperatures. V2O5-loaded CVC-TiO2 catalysts with different calcination temperatures were prepared by the CVC and impregnation method, and samples calcined at 100°C, 200°C, 300°C and 500°C, as well as samples which were not calcined, were compared for their physicochemical characteristics and catalytic behavior in NH3-SCR of NOx, as determined by XRD, FT-IR and XPS analysis, and NH3-SCR of NOx catalytic activity tests. V2O5/CVC-TiO2 was composed mainly in the anatase phase, and did not showed V2O5 peaks though XRD analysis. FT-IR results revealed that the carboxyl acid band (containing formic acid) was observed at 1700cm-1 ~ 1200cm-1. However, the carboxyl acid band was almost eliminated at calcination temperatures of 500℃. We also observed for samples calcined at 500 ºC, that V4+/5+ was balanced and the binding energy of hydroxyl groups was lower than that for those calcined below 300ºC, according to XPS data.