Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Preparation and Characterization of New NiO-ZrO2/WO3 Catalyst for Ethylene Dimerization

에틸렌 이량화를 위한 새로운 NiO-ZrO2/WO3촉매의 제조와 특성

  • Sohn, Jong Rack (Dept. of Industrial Chemistry, Engineering College, Kyungpook National University) ;
  • Shin, Dong Cheol (Dept. of Industrial Chemistry, Engineering College, Kyungpook National University) ;
  • Park, Man Young (Dept. of Industrial Chemistry, Engineering College, Kyungpook National University)
  • 손종락 (경북대학교 공과대학 공업화학과) ;
  • 신동철 (경북대학교 공과대학 공업화학과) ;
  • 박만영 (경북대학교 공과대학 공업화학과)
  • Received : 1996.08.13
  • Accepted : 1996.09.17
  • Published : 1996.10.10
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Abstract

A series of catalysts, $NiO-ZrO_2/WO_3$, for ethylene dimerization were prepared by coprecipitation from a solution of nickel chloride - zirconium oxychloride mixture followed by dry impregnation with an aqueous solution of ammonium metatungstate and calcination in air. On the basis of the results obtained from x-ray diffraction and DSC, the addition of NiO and $WO_3$ to $ZrO_2$ shifted the transition of $ZrO_2$ from amorphous to a tetragonal phase toward higher temperatures due to the interaction between NiO(or $WO_3$) and $ZrO_2$. $NiO-ZrO_2$ without $WO_3$ was inactive for the ethylene dimerization, but $NiO-ZrO_2/WO_3$ was found to be very active even at room temperature. The high catalytic activity of $NiO-ZrO_2/WO_3$ was closely correlated with the increase of acid strength by the inductive effect of $WO_3$.

에틸렌 이량화반응을 위한 일련의 $NiO-ZrO_2/WO_3$촉매를 염화니켈-옥시염화 질코니움 수용액을 공침시키고 ammonium metatungstate용액으로 함침시킨 다음 공기 중에서 소성하여 제조하였다. X-선 회절과 DSC로부터 얻은 결과를 근거로 하면 $ZrO_2$에 NiO 및 $WO_3$를 첨가하면 $ZrO_2$와 첨가된 산화물과의 상호작용으로 $ZrO_2$의 무정형에서 tetragonal phase로의 상전이 온도가 더 높은 온도로 이동되었다. $WO_3$가 첨가되지 않은 $NiO-ZrO_2$는 에틸렌 이량화반응에 전혀 촉매 활성을 나타내지 아니하였으나 $WO_3$가 첨가된 $NiO-ZrO_2/WO_3$촉매는 실온에서도 높은 활성을 나타내었다. 이와 같은 $NiO-ZrO_2/WO_3$의 높은 촉매활성은 $WO_3$의 유도효과에 의한 산세기의 증가와 밀접한 관련이 있었다.

Keywords

Acknowledgement

Supported by : 한국학술진흥재단

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