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http://dx.doi.org/10.5012/bkcs.2003.24.3.311

Characterization of Vanadium Oxide Supported on Zirconia and Modified with MoO3  

Sohn, Jong-Rack (Dept. of Industrial Chemistry, Engineering College, Kyungpook National University)
Seo, Ki-Cheol (Dept. of Industrial Chemistry, Engineering College, Kyungpook National University)
Pae, Young-Il (Dept. of Chemistry, University of Ulsan)
Publication Information
Bulletin of the Korean Chemical Society / v.24, no.3, 2003 , pp. 311-317 More about this Journal
Abstract
Vanadium oxides supported on zirconia and modified with MoO₃were prepared by adding Zr(OH)₄powder into a mixed aqueous solution of ammonium metavanadate and ammonium molybdate followed by drying and calcining at high temperatures. The characterization of prepared catalysts was performed using FTIR, Raman spectroscopy and solid-state $^{51}V$ NMR. In the case of a calcination temperature of 773 K, for samples containing low loading of $V_2O_5$, below 15 wt %, vanadium oxide was in a highly dispersed state, while for samples containing high loading of $V_2O_5$, equal to or above 15 wt %, vanadium oxide was well crystallized because the $V_2O_5$ loading exceeded the formation of a monolayer on the surface of $ZrO_2$. The $ZrV_2O_7$ compound was formed through the reaction of $V_2O_5\;and\;ZrO_2$ at 873 K and the compound decomposed into $V_2O_5\;and\;ZrO_2$ at 1073 K, which were confirmed by FTIR spectroscopy and solid-state $^{51}V$ NMR. IR spectroscopic studies of ammonia adsorbed on $V_2O_5-MoO_3/ZrO_2$ showed the presence of both Lewis and Bronsted acids.
Keywords
Characterization; $V_2O_5-MoO_3/ZrO_2$; $^{51}V$ NMR; FTIR; XRD;
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