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Co가 첨가된 Cu-Ce/γ-Al2O3 촉매상에서 개질수소가스에 포함된 CO의 선택적 산화반응: (II) CO2와 H2O의 영향
Selective Oxidation of CO in Hydrogen Rich Stream over Cu-Ce/g-Al2O3 Catalysts Doped with Co: (II) CO2 and H2O Effect
충남대학교 화학공학과, 305-764 대전시 유성구 궁동 220 1경북대학교 화학공학과, 702-701 대구시 북구 산격동 1370 2광주대학교 토목환경공학부, 503-703 광주시 남구 진월동 592-1 3한국화학연구원 화학기술부, 305-600 대전시 유성구 장동 100 4한국에너지기술연구원 전환공정연구센터, 305-343 대전시 유성구 장동 71-2
Department of Chemical Engineering, Chungnam National University, 20, Gung-dong, Yuseong-gu, Daejeon 305-764, Korea 1Department of Chemical Engineering, Kyungpook National University, 1370, Sangyeok-dong, Buk-gu, Daegu 702-701, Korea 2Department of Civil & Environmental Engineering, Kwangju University, 592-1, Jinwol-dong, Nam-gu, Kwangju 502-703, Korea 3Division of Advanced Technology, KRICT, 100, Jang-dong, Yuseong-gu, Daejeon 305-600, Korea 4Energy Conversion Process Research Center, KIER, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
pjw2131@hanmail.net
HWAHAK KONGHAK, October 2003, 41(5), 564-571(8), NONE
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Abstract
선택적 CO 산화촉매인 Cu-Ce/γ-Al2O3 촉매 및 조촉매로서 Co가 소량(0.2 wt%)첨가된 Cu-Ce-Co/γ-Al2O3 촉매에 대하여 모사개질 가스(1 vol.% CO+1 vol.% O2+60 vol.% H2 in N2 balance) 내에 존재하는 CO2와 H2O가 선택적 CO 산화반응에 미치는 영향을 조사하였다. 이들 CO2와 H2O가 개질가스 내에 존재할 경우 촉매를 피독시켜 저온 산화활성이 크게 감소되어 최고 55 ℃의 반응온도 증가를 가져왔다. 이러한 저온 산화활성 감소가 일어나는 원인이 개질가스 중에 포함되어 있는 CO2와 H2O가 각각 혹은 상호 경쟁적으로 산화 활성점에 강하게 흡착하기 때문이라는 것을 CO2와 H2O의 승온탈착실험(TPD)을 통하여 확인할 수 있었다. Cu-Ce-Co/γ-Al2O3 촉매의 경우는 Cu-Ce/γ-Al2O3에 비하여 CO2와 H2O가 동시에 존재하는 경우에 대한 피독 저항성이 상대적으로 우수하여 이들 피독물이 존재할 경우에도 99.9 %의 CO가 전환되는 T99온도창이 210 - 225 ℃범위에서 존재하였다.
Cu-Ce/γ-Al2O3 and Cu-Ce-Co/γ-Al2O3 promoted with 0.2 wt.% Co were prepared and their catalytic performance was evaluated for the selective oxidation of CO in a H2-rich condition (1 vol.% CO+1 vol.% O2+60 vol.% H2 in N2 balance). When CO2 and H2O were present in the reformed gas feed, both Cu-Ce/γ-Al2O3 and Cu-Ce-Co/γ-Al2O3 showed decrease in oxidation activity of CO at low temperatures especially under 200 ℃. Compared with the Cu-Ce/γ-Al2O3, however, the Cu-Ce-Co/γ-Al2O3 showed higher resistance for the CO2 and H2O and also there existed a temperature window of T99.9 from 210 to 225 ℃ corresponding to the conversion of 99.9% CO. From CO2/H2O-TPD, it can be concluded that the main cause for the_x000D_
decrease in catalytic activity may be attributed to the blockage of the active sites by competitive adsorption of water vapor and CO2 with the reactant at low reaction temperatures.
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Dudfield CD, Chen R, Adcock PL, J. Power Sources, 85(2), 237 (2000)
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Park JW, Lee YW, Jeong JH, Lee DK, Park YK, Yoon WL, HWAHAK KONGHAK, 41(4), 445 (2003)
