Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Characterization and Acid Catalytic Properties of Beryllia-Silica Catalysts

베릴리아-실리카 촉매의 특성과 산촉매성질

  • Sohn, Jong-Rack (Dept. of Industrial Chemistry, Engineering College, Kyungpook Nat'l Univ.,) ;
  • Park, Eun-Hee (Dept. of Industrial Chemistry, Engineering College, Kyungpook Nat'l Univ.,) ;
  • Jang, Hyang-Ja (Dept. of Industrial Chemistry, Engineering College, Kyungpook Nat'l Univ.,) ;
  • Kim, Hae-Won (Dept. of Industrial Chemistry, Kyungpook Sanup Univ.)
  • 손종락 (경북대학교 공과대학 공업화학과) ;
  • 박은희 (경북대학교 공과대학 공업화학과) ;
  • 장향자 (경북대학교 공과대학 공업화학과) ;
  • 김해원 (경북산업대학교 공과대학 공업화학과)
  • Received : 1995.08.14
  • Accepted : 1996.01.20
  • Published : 1996.04.10
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Abstract

A series of $BeO-SiO_2$ catalysts were prepared by coprecipitation from the mixed solution of berylium chloride and sodium silicate. The addition of BeO to $SiO_2$ caused the increased of acidity, acid strength, specific surface area, and acid catalytic activity, giving a maximum at 20 mol% of BeO. On the basis of x-ray diffraction pattern, the catalysts calcined at $400{\sim}500^{\circ}C$ were found to be amorphous, having both $Br{\ddot{o}}nsted$ and Lewis acid sites. Catalytic activities for cumene dealkylation were closely correlated with the acidity of catalysts.

일련의 $BeO-SiO_2$ 촉매를 염화베릴리움과 sodium silicate 혼합 용액을 공침전법으로 제조하였다. $SiO_2$에 BeO를 첨가하면 표면적, 산의 양, 산세기, 산촉매활성이 증가하여 BeO 함량이 20mol%일 때 최대를 나타내었다. X-선 회절로 조사한 결과 $400{\sim}500^{\circ}C$에서 소성된 촉매는 무정형으로 존재하였으며 $Br{\ddot{o}}nsted$ 산점과 Lewis 산점 모두를 가지고 있었다. Cumene의 dealkylation 반응에 대한 촉매활성은 촉매의 산의 양과 밀접한 관계를 가졌다.

Keywords

Acknowledgement

Supported by : 촉매기술연구소

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