Dechlorination of HCFC-142b over Supported Pd Catalysts and Solid Acid Catalysts

Pd담지촉매와 고체산촉매를 이용한 HCFC-142b의 탈염소반응

  • Han, K.Y. (School of Chemical Engineering and Biotechnology, Ajou University) ;
  • Seo, K.W. (School of Chemical Engineering and Biotechnology, Ajou University) ;
  • Mok, Y.I. (School of Chemical Engineering and Biotechnology, Ajou University) ;
  • Park, K.Y. (CFC Alternatives Research Center, KIST) ;
  • Ahn, B.S. (CFC Alternatives Research Center, KIST)
  • 한광영 (아주대학교 화학.생물공학부) ;
  • 서경원 (아주대학교 화학.생물공학부) ;
  • 목영일 (아주대학교 화학.생물공학부) ;
  • 박건유 (한국과학기술연구원 CFC대체연구센터) ;
  • 안병성 (한국과학기술연구원 CFC대체연구센터)
  • Received : 1997.12.22
  • Accepted : 1998.04.02
  • Published : 1998.06.10

Abstract

Supported Pd($Pd/AlF_3$, $Pd/{\gamma}-Al_2O_3$) catalysts and solid-acid catalysts(${\gamma}-Al_2O_3$, ${\alpha}-Al_2O_3$, $AlF_3$) were used to perform dechlorination of HCFC-142b(1-chloro-1,1-difluoroethane) in the presence of excess hydrogen. In the reactions the effects of reaction temperature, the mole ratio(r) of $H_2$ to HCFC-142b and the amount of supported Pd on dechlorination of HCFC-142b into HFC-143a(1,1,1-trifluoroethane) or HFC-152a(1,1-difluoroethane) were investigated. The experimental results showed that the conversion of HCFC-142b to product gases were 60% and 92%, respectively, and the selectivity to HFC-143a in the product gases were 58% and 64% for $Pd/AlF_3$ and $Pd/{\gamma}-Al_2O_3$ catalysts, respectively. On these catalysts an optimum reaction condition was found at $200^{\circ}C$ with the space time of reactant gases as 1.05 second and the mole ratio of $H_2$ to HCFC-142b as 3. Solid-acid catalysts were also tested at the same reaction condition. The results showed that the conversions of HCFC-142b to product gases were 12%, 8% and 7%, and the selectivities to HFC-152a were 94%, 92% and 90% for ${\gamma}-Al_2O_3$, ${\alpha}-Al_2O_3$ and $AlF_3$ catalysts, respectively.

Keywords

Acknowledgement

Supported by : 한국과학기술연구원

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