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http://dx.doi.org/10.5012/bkcs.2007.28.12.2459

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)
Publication Information
Bulletin of the Korean Chemical Society / v.28, no.12, 2007 , pp. 2459-2465 More about this Journal
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.
Keywords
$V_2O_5$ modification effect; Dispersed $V_2O_5$ amount; 2-Propanol dehydration; Cumene dealkylation;
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