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모더나이트중 동의 환원·산화 특성

Redox Behavior of Copper in Mordenite

HWAHAK KONGHAK, August 1988, 26(4), 404-410(7), NONE
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Abstract

탈알칼리시킨 모더나이트(NH4M)를 이온교환(CuHM), 탈알칼리와 열처리시킨 모더나이트(HM#)를 수용성 함침(Cu/HM#) 그리고 HM#과 분말 산화동의 혼합(Cu//HM#) 등으로 세 종류의 시료를 만들었다. 그리고 이들 시료를 일산화탄소 또는 수소로 환원 그리고 산소를 산화시키면서 모더나이트에 담지된 동의 거동을 연구하였다. 동형 모더나이트를 환원·산화시킬 경우 탈알칼리, 탈알루미늄 그리고 열처리 이력을 많이 가진 HM#에서 동의 환원·산화성이 단순히 이온교환한 것(HM)보다 용이하였다. 환원·산화처리를 반복할 때 CuHM, Cu/HM# 그리고 Cu/HM# 모두 용이하게 Cu(0) 및 CuO이 형성되어 세공과 표면사이를 확산하나 대부분의 동은 표면에 편재됨을 알 수 있었다.
Three Copper containing mordenites such as ion-exchanged (CuHM), impregnated (Cu/HM#) and mechanically mixed mordenite with cupric oxide (Cu//HM#) were studied to understand the behavior of copper in these mordenites when redox-treating under the carbon monoxide or hydrogen as reducing agent and oxygen as oxidizing one. It was found that loaded cupric ions containing in decationized, dealuminated and repeatedly thermal treated hydrogen mordenite (HM#) were more readily reduced than simply decationized one (HM). When redox-repeating, the copper metal and cupric oxide on CuHM, Cu/HM# and Cu//HM# easily formed and diffused readily in direction of either internal or external surface of the mordenite crystal, but most of them were distributed on external surface of the zeolite crystal.

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