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동을 포함한 모더나이트상에서 일산화질소의 분해
NO Decomposition on Copper-Containing Mordenites
HWAHAK KONGHAK, October 1991, 29(5), 606-613(8), NONE
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Abstract
수소형 모더나이트(HM)를 그대로 또는 실리카/알루미나의 비를 변화시키고 동 및/또는 크롬을 염의 상태로 침투시킨 후 500℃와 750℃에서 수소와 산소로 환원ㆍ산화 처리하고 일산화질소의 분해반응을 수행하였다. 산화동 함량에 따른 촉매의 활성은 10wt%까지는 산화동의 함량이 증가할수록 활성도 증가하지만 그 이상에서는 활성이 감소하였다. 전처리로 750℃에서 환원ㆍ산화 처리한 시료의 경우에는 환원ㆍ산화 처리시의 동이온의 활성점 및 담체의 결정성의 저하로 인하여 500℃에서 환원ㆍ산화 처리한 시료보다 낮은 촉매활성을 나타내었다. 그러나 HM로부터 산처리 조건을 달리하여 실리카/알루미나의 비를 증가시키고 크롬을 동과 함께 함침시켜 모더나이트 구조의 열 안정을 높인 결과 750℃와 같은 고온의 전처리 시료에서도 NO분해의 촉매활성의 안정성을 보였다.
Hydrogen mordenite and the modified mordenites of different silica/alumina ratio were impreg-nated by cupric and/or chromic salts, and redox-treated with hydrogen/oxygen at 500℃ and 750℃, respectively and used for catalytic decomposition of NO. Activity of NO decomposition increases with contents of copper and shows maximum at 10wt%. Catalytic activities for the samples treated in 750℃ are lower than that in 500℃. But the increase of silica/alumina by aluminum extraction and chromic addition to cupric salt for the impregnation improved the thermal crystal stability of mordenite which results in stabilized catalytic activity even for the amples pretreated at 750℃.
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정태환, 이창용, 하백현, 투고예정
Crucq A, Frennet A, "Catalysis and Automotive Pollution Control," Elsevier, Amsterdam, p. 1 (1987)
Nam IS, Eldridge JW, Kittrell JR, Ind. Eng. Chem. Prod. Res. Dev., 25, 186 (1986)
Klimish RL, Larson JG, "The Catalytic Chemistry of Nitrogen Oxides," Plenum Press, New York, p. 63 (1975)
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Kagawa S, Yokoo S, Iwamoto M, J. Chem. Soc.-Chem. Commun., 1058 (1978)
Iwamoto M, Furukawa H, Mine Y, Uemura F, Mikuriya S, Kagawa S, J. Chem. Soc.-Chem. Commun., 1272 (1986)
Iwamoto M, Furukawa H, Kagawa S, "New Developments in Zeolite Science and Technology," Elsevier, Tokyo, p. 943 (1986)
하백현, 신원학, 환경과학 논문집, 한양대학교 환경과학연구소, 5, 33 (1984)
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Whyte TE, DallaBetta RA, Derouane EG, Baker RTK, "Catalytic Materials: Relationship between Structure and Reactivity," ACS, Washington, D.C., p. 157 (1984)
Olsson RW, Rollmann LD, Inorg. Chem., 16(3), 651 (1977)
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이명석, 한양대학교 석사논문 (1989)
Kuchrov AV, Slinkin AA, Kodrut'ev DA, Bondarenko TN, Minachev KM, Zeolites, 5, 320 (1985)
Tvaruskova Z, Bozacek V, Collection Czech. Chem. Commun., 45, 2479 (1980)
Goupil JM, Hemiduy JF, Cornet D, Zeolites, 2, 47 (1982)
Ghil JH, Lee CY, Ha BH, HWAHAK KONGHAK, 29(1), 42 (1991)
정태환, 이창용, 하백현, 투고예정
