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알칼리 및 산으로 처리한 활성탄에 담지시킨 팔라듐 촉매상에서 CFC-12(CCl2F2)의 수소화 분해반응
Catalytic Hydrogenolysis of CFC-12(CCl2F2) over Pd Catalyst Supported on Activated Carbon Treated with Alkali and Acids
한국과학기술연구원 CFC대체연구센터, 서울
CFC Alternatives Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, Korea
bsahn@kist.re.kr
HWAHAK KONGHAK, October 2000, 38(5), 585-590(6), NONE
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Abstract
알칼리 및 산 혹은 두 가지 산으로 연속하여 전처리한 활성탄에 담지시킨 팔라듐 촉매(Pd/C)상에서 CFC-12(CCl2F2)의 수소화 분해반응을 수행하였다. 제조한 Pd/C촉매의 특성은 원소분석, XRD, TEM, 질소 물리흡착 및 수소 화학흡착 실험을 통하여 조사하였다. 부반응을 촉진시킬 것으로 생각되는 활성탄에 함유된 미량의 금속성분은 NaOH-HCl, HCl-HF, HF-HCl 처리에 의해 상당량 제거되었음을 확인할 수 있었다. 이렇게 전처리한 활성탄을 사용하여 제조한 촉매들은 전처리하지 않은 활성탄을 사용한 촉매에 비해 뛰어난 수소화 분해반응 활성과 HFC-32(CH2F2)의 생성반응에 대해 높은 선택도를 보였다. 또한 특성분석결과 Pd의 분산도가 크게 향상되었고, 촉매의 소결(sintering) 현상이 현저히 억제되었음을 확인할 수 있었다.
Catalytic hydrogenolysis reaction of CFC-12(CCl2F2) was investigated over Pd catalysts supported on the activated carbons which were pretreated with alkali-acid and/or acid-acid in series. The Pd/C catalysts were characterized by ICP, XRD, TEM, N2 physisorption, and H2 chemisorption. Minor metal components known as the side reaction catalyst in CFC-12 catalytic hydrogenolysis in the activated carbon were removed by consecutive treatment with NaOH-HCl and/or HCl-HF, HF-HCl. The pretreated Pd/C catalysts showed higher hydrogenolysis activity and selectivity to HFC-32(CH2F2) than the corresponding untreated ones. It was found that the dispersions of the pretreated catalysts were improved and the sintering phenomena were significantly restricted.
Keywords
References
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Coq B, Cognion JM, Figueras F, Tournigant D, J. Catal., 141, 21 (1993)
Juszczyk W, Malinowski A, Karpinski Z, Appl. Catal. A: Gen., 166(2), 311 (1998)
Joen SG, Shul YG, Lee H, Ahn BS, HWAHAK KONGHAK, 37(1), 103 (1999)
Deshmukh S, d'Itri JL, Catal. Today, 40(4), 377 (1998)
Moon DJ, Chung MJ, Park KY, Hong SI, Appl. Catal. A: Gen., 168(1), 159 (1998)
Makee M, vandeSandt EJAX, Wiersma A, Moulijin JA, J. Mol. Catal. A-Chem., 134, 191 (1998)
vandeSandt EJAX, Wiersma A, Makkee M, vanBekkum H, Moulijn JA, Appl. Catal. A: Gen., 173(2), 161 (1998)
Ahn BS, Jeon SG, Lee HJ, Park KY, J. Mol. Catal. A-Chem., in press
Rao VNM, U.S. Patent, 5,136,113
vandeSandt EJAX, Wiersma A, Makkee M, vanBekkum H, Moulijn JA, Catal. Today, 35(1-2), 163 (1997)
Thomson J, Webb G, Winfield J, Bonniface D, Shortman C, Winterton N, Appl. Catal. A: Gen., 97, 67 (1993)
Krishnankutty N, Li J, Vannice MA, Appl. Catal. A: Gen., 173(2), 137 (1998)
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Moon DJ, Chung MJ, Ahn BS, Park KY, Korean Patent 242790 (1999)
Jeon SG, Shul YG, Lee HJ, Ahn BS, HWAHAK KONGHAK, 37(1), 103 (1999)
