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열처리 활성탄의 메탄올 흡착특성 연구

Characteristics of Methanol Adsorption over Thermally Treated Activated Carbon

유경선^† 신장원 신성욱 정종현¹ 송광섭² 서용석² 강순국³

Kyung Seun Yoo^† Jang Won Shin Sung Wook Shin Jong Hyun Jeong¹ Kwang Seop Song² Yong Seog Seo² Soon-Kook Kang³

광운대학교 환경공학과, 136-701 서울시 노원구 월계동 447-1 ¹서라벌대학 생명보건학부, 780-711 경북 충주시 충효동 165 ²한국에너지기술연구원, 305-343 대전시 유성구 장동 71-2 ³한국에너지기술연구원 선문대학교, 336-708 충남 아산시 탕정면 갈산리 100

Department of Environmental Engineering, Kwangwoon University, 447-1 Wolgye-dong, Nowon-gu, Seoul 139-701, Korea ¹Division of Biotechnology and Health Engineering, Seorabol College, 165 Gyeong-ju, Kyungbuk 780-711, Korea ²Combustion Catalysis Research Lab., Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea ³Department of Environmental Engineering, Sunmoon University, 100 Galsan-ri, Tangjeong-myon, Asan 336-708, Korea

HWAHAK KONGHAK, August 2003, 41(4), 491-496(6), NONE

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Abstract

활성탄의 열처리 효과가 메탄올 흡착특성에 미치는 영향을 고찰하기 위하여, 열전도도검출기가 장착된 기체크로마토그라프에서 펄스응답곡선을 측정하고 모멘트 법으로 반응파라메터를 계산하였다. 메탄올의 평형흡착상수와 표면흡착열은 열처리한 활성탄에서 감소하였다. 이것은 열처리 활성탄의 표면산소 기능기들의 감소로 메탄올과의 상호 작용력이 감소하였음을 의미하며 활성탄으로부터 배출되는 CO/CO2 농도를 측정한 승온탈착 실험으로 확인하였다. 활성탄의 열처리에 관계없이 큰 세공과 작은 세공 확산계수는 같은 크기규모의 값을 보였으며 표면확산과 Knudsen확산이 작은 세공과 큰 세공에서 각각 지배적이었다.

To investigate the effect of thermal treatment of activated carbon on methanol adsorption, pulse-responses were measured in a gas chromatograph equipped with thermal conductivity detector (TCD), and reaction parameters were calculated by the moment method. Equilibrium adsorption constants and isosteric heat of adsorption of methanol decrease in the thermally treated activated carbon. This shows the decrease in the interaction between activated carbon and methanol due to the decrease of concentration of surface oxygen, which was confirmed by TPD experiment measuring the evolved concentration of CO/CO2 from the activated carbon. Regardless of thermal treatment of activated carbon, macro- and micro-diffusivities showed the value of same order of magnitude and surface and Knudsen diffusion prevails in micro and macro pore, respectively.

Keywords

Adsorption Methanol Thermal Treatment Chromatography Activated Carbon

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