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팔라디움 촉매를 이용한 CFC-114a의 수소화 반응에 관한 연구
Hydrogenation of CFC-114a over Palladium Catalysts
HWAHAK KONGHAK, December 1993, 31(6), 831-837(7), NONE
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Abstract
CFC-114a의 수소화 반응에서 담체의 영향과 1B족 금 속의 첨가에 따른 영향을 고찰하였다. 여러 담체중 알루미나 담지 팔라디움 촉매가 활성과 HFC-134a에 대한 선택도가 가장 뛰어났으며, 티타니아 담지 촉매가 다음이었다. 알루미나와 티타니아 담지 촉매가 활성탄과 실리카 담지 촉매에 비해 반응활성과 선택도가 뛰어난 이유는 승온탈착실험으로 확인한 결과, 강하게 화학 흡착하는 CFC 반응물의 양이 많기 때문으로 생각된다. 알루미나 담체에 대해 팔라디움과 1B족 금속(Au, Ag)을 함께 담지할 경우 팔라디움만 담지한 경우보다 활성과 선택도가 증가하였다. 이는 알루미나에 팔라디움과 1B족 금속(Au, Ag)을 함께 담지할 경우 활성점으로 작용하는 팔라디움의 분산도가 증가하기 때문임을 수소흡착실험과 EXAFS 실험을 통하여 확인하였다.
The effects of supports and 1B group metal addition have been investigated in a hydrogenation of CFC-114a. Among the supports, alumina and titania supported palladium catalysts showed higher activity and selectivity for HFC-134a than those on active carbon and silica supports. The reactivity patterns are in good correlation with the amount of strongly adsorbed CFC reactant, as evidenced by the TPD experiments. Bimetallic catalysts(palladium and 1B metal; Au and Ag) supported on alumina showed some increase in activity and selectivity. It is presumed from hydrogen chemisorption, TPD and EXAFS that the role of 1B metals is to increase the dispersion of palladium crystallites.
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