Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of V2O5 Modification in V2O5/TiO2-ZrO2 Catalysts on Their Surface Properties and Catalytic Activities for Acid Catalysis

  • Sohn, Jong-Rack (Department of Applied Chemistry, Engineering College, Kyungpook National University) ;
  • Lee, Cheul-Kyu (Department of Applied Chemistry, Engineering College, Kyungpook National University)
  • Published : 2007.12.20
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Abstract

V2O5/TiO2-ZrO2 catalyst modified with V2O5 was prepared by adding Ti(OH)4-Zr(OH)4 powder into an aqueous solution of ammonium metavanadate followed by drying and calcining at high temperatures. The characterization of prepared catalysts was performed using XRD, DSC, solid-state 51V NMR, and FTIR. In the case of calcination temperature of 500 oC, for the catalysts containing low loading V2O5 below 25 wt % vanadium oxide was in a highly dispersed state, while for catalysts containing high loading V2O5 equal to or above 25 wt % vanadium oxide was well crystallized due to the V2O5 loading exceeding the formation of monolayer on the surface of TiO2-ZrO2. The strong acid sites were formed through the bonding between dispersed V2O5 and TiO2-ZrO2. The larger the dispersed V2O5 amount, the higher both the acidity and catalytic activities for acid catalysis.

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References

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