Acidic Properties of Tungsten Oxide Supported on Zirconia and Catalytic Activities for Acid Catalysis

Zirconia에 담지된 산화텅스텐 촉매의 산 성질과 산 촉매활성

  • Sohn, Jong Rack (Department of Industrial Chemistry, Engineering College, Kyungpook National University) ;
  • Park, Man Young (Department of Industrial Chemistry, Engineering College, Kyungpook National University)
  • 손종락 (경북대학교 공과대학 공업화학과) ;
  • 박만영 (경북대학교 공과대학 공업화학과)
  • Received : 1998.09.07
  • Accepted : 1998.11.23
  • Published : 1999.04.10


Tungsten oxide supported on zirconia was prepared by drying powdered $Zr(OH)_4$ with ammonium metatungstate aqueous solution, followed by calcining in air at high temperature. Upon the addition of only small amount of tungsten oxide (1 wt % $WO_3$) to $ZrO_2$, both the acidity and acid strength of catalyst increased remarkably, showing the presence of $Br{\ddot{o}}nsted$ and Lewis acid sites on the surface of $WO_3$/$ZrO_2$. The high acid strength and large amount of acid sites on $WO_3$/$ZrO_2$ were due to the presence of the W=O bond nature of complex formed by the interaction between $WO_3$ and $ZrO_2$. The catalyst containing 20 wt % $WO_3$, calcined at 973 K, showed the highest catalytic activity for the 2-propanol dehydration, while the catalyst containing 15 wt % $WO_3$, calcined at 1023 K, exhibited the highest catalytic activity for the cumene dealkylation. For the 2-propanol dehydration the catalytic activities of $WO_3$/$ZrO_2$ catalysts were roughly correlated with their acidities.


Tungsten Oxide;Acidic Properties;Zirconia;2-propanol dehydration;Cumene dealkylation


Supported by : 한국과학재단


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