Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effect of Preparation Method for Pd/C Catalysts on Pd Characterization and their Catalytic Activity

Pd/C 촉매 제조 방법에 따른 Pd 금속의 특성 및 촉매 활성

  • Kim, Ji Sun (Ulsan Regional Division, Korea Institute of Industrial Technology (KITECH)) ;
  • Hong, Seong-Soo (Department of Chemical Engineering, Pukyong National University) ;
  • Kim, Jong-Hwa (Department of Chemical Engineering, Changwon National University) ;
  • Lee, Man Sig (Ulsan Regional Division, Korea Institute of Industrial Technology (KITECH))
  • 김지선 (한국생산기술연구원 울산지역본부) ;
  • 홍성수 (부경대학교 화학공학과) ;
  • 김종화 (창원대학교 화공시스템공학과) ;
  • 이만식 (한국생산기술연구원 울산지역본부)
  • Received : 2015.07.15
  • Accepted : 2015.07.31
  • Published : 2015.10.10
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Abstract

Pd/C catalysts were prepared by various preparation methods such as ion exchange, impregnation and polyol method and also characterized by nitrogen adsorption-desorption isothermal, XRD, FE-TEM and CO-chemisorption. The activities of these catalysts were tested in the hydrogenation of cyclohexene to cyclohexane. Catalytic activities of Pd/C catalysts were found to be effected by the chosen preparation methods. Pd dispersions of each Pd/C catalysts prepared by ion exchange, impregnation and polyol method were 17.55, 13.82% and 1.35%, respectively, confirmed by CO-chemisorption analysis. These were also in good agreement with the FE-TEM results. The Pd/C catalyst prepared by ion exchange method exhibits good performance with the cyclohexene conversion rate of 71% for 15 min. These results indicate that Pd/C catalyst having higher dispersion and lower particle size is in favor of hydrogenation cyclohexene and also Pd dispersion increases with the increment of catalytic activity.

본 연구는 여러 가지 방법에 의해 제조된 Pd/C 촉매의 특성을 질소흡탈착등온선, XRD, FE-TEM 및 CO-chemisorption을 이용하여 확인하였고, 제조된 촉매의 활성을 cyclohexene의 수소화 반응을 통하여 확인하여 제조방법에 따른 촉매의 특성 변화가 촉매 활성에 미치는 영향에 대하여 연구하였다. 각각의 제조방법을 통하여 제조된 Pd/C 촉매의 FE-TEM 분석결과, 이온교환법으로 제조된 촉매의 분산 정도가 매우 우수하며, 폴리올법으로 제조된 촉매의 분산 정도가 매우 낮음을 확인하였다. CO-chemisorption 분석에 의한 분산도 결과 이온교환법, 함침법 및 폴리올법으로 제조된 촉매의 Pd 분산도가 각각 17.55, 13.82% 및 1.35%로 나타나 FE-TEM 결과와 일치함을 확인하였다. 이후 cyclohexene의 수소화반응을 통하여 제조된 촉매의 활성을 확인하였고, 이온교환법으로 제조된 촉매의 cyclohexene의 전환율이 71%로 가장 높음을 확인하였다. 이는 탄소 담지체에 담지된 Pd의 분산도가 반응 활성에 영향을 미쳐 나타난 결과임을 알 수 있었다.

Keywords

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