γ-Al2O3에 담지된 Cu-Ce 기준촉매에 조촉매로서 Co가 소량 첨가된 촉매를 제조하여 모사개질 가스(1% CO, 1% O2, 60% H2 in N2 balance)의 선택적 CO 산화반응을 수행하였다. 조촉매 함량, 과잉산소율 λ(=2[O2]/[CO])을 변화시켜가면서 반응온도에 따른 활성 및 선택도를 조사하였다. Cu-Ce 촉매의 함량 및 비율에 따른 최적 활성을 실험 조사한 결과, Cu-Ce(4:16 wt%) 촉매가 넓은 온도 범위인 175-220 ℃ 사이에서 99% 이상의 높은 CO 산화 활성을 보였으며, 이때의 CO 선택도는 50-80%로 나타났다. 또한 Co를 조촉매로 첨가한 Cu-Ce-Co(4.0:15.8:0.2 wt%) 촉매는 150-220 ℃의 넓은 온도 범위에서 Cu-Ce 촉매에 비하여 더욱 우수한 반응 활성(>99% CO전환율)과 선택도(50-94%)를 나타내었다. 승온환원(CO-/H2-TPR) 및 승온산화(TPO) 실험 결과, Cu-Ce-Co(4.0:15.8:0.2 wt%) 촉매의 경우 타 촉매에 비해 촉매의 산화/환원 특성이 가장 우수하며, CO에 대한 높은 흡착능을 나타냄을 알 수 있었다.

Cu-Ce/γ-Al2O3 catalysts promoted with Co were prepared and tested for selective oxidation of CO in a H2-rich stream. The effects of promoter content, degree of excess oxygen (λ) were investigated for activity and CO selectivity while changing temperatures. Among the various Cu-Ce catalysts having different metal loadings and composition, Cu-Ce (4:16 wt%) catalyst_x000D_ showed the highest activity (>T99) and selectivities (80-50%) under wide temperature range of 175-220 ℃. When the Cu-Ce catalyst was further modified with 0.2 wt% Co as a promoter, the highest activity (>T99) and selectivities (94-50%) was obtained over the wide temperature windows of 150-220 ℃. From CO-/H2-TPR and TPO, it was found that by the addition of 0.2 wt% Co on Cu-Ce catalyst, oxidation-reduction activity of catalyst was improved, which resulted in the increase of catalytic activity and selectivity of CO oxidation in excess H2 environment.

Selective Oxidation of CO Cu-Ce Based Catalyst CO-/H2-TPR TPO

Seshan K, Lercher JA, "Carbon Dioxide Chemistry: Environmental Issues," The Royal Society of Chemistry, 16 (1994)
Armor JN, Appl. Catal. A: Gen., 176(2), 159 (1999) 
Gottesfeld S, Pafford J, J. Electrochem. Soc., 135(10), 2651 (1988) 
Emonts B, Hansen JB, Jorgensen SL, Hohlein B, Peters R, J. Power Sources, 71(1-2), 288 (1998) 
Kawatsu S, J. Power Sources, 71(1-2), 150 (1998) 
Dudfield CD, Chen R, Adcock PL, J. Power Sources, 85(2), 237 (2000) 
Oh SH, Sinkevitch RM, J. Catal., 142, 254 (1993) 
Brown ML, Green AW, Cohn G, Andersen HC, Ind. Eng. Chem., 52(10), 841 (1960) 
Cohn JGE, U.S. Patent, 3,216,783 (1965)
Bonacci JC, Otchy TG, Ackerman T, U.S. Patent, 4,238,468 (1980)
Plog C, Maunz W, Stengel T, Andorf R, European Patent, 0,650,922 A1 (1995)
Kahlich MJ, Gasteiger HA, Behm RJ, J. Catal., 171(1), 93 (1997) 
Watanabe M, Uchida H, Igarashi H, Suzuki M, Chem. Lett., 21 (1995) 
Igarashi H, Uchida H, Suzuki M, Sasaki Y, Watanabe M, Appl. Catal. A: Gen., 159(1-2), 159 (1997) 
Torres Sanchez RM, Ueda A, Tanaka K, Haruta M, J. Catal., 168(1), 125 (1997) 
Kahlich MJ, Gasteiger HA, Behm RJ, J. Catal., 182(2), 430 (1999) 
Teng Y, Sakurai H, Ueda A, Kobayashi T, Int. J. Hydrog. Energy, 24(4), 355 (1999) 
Korotkikh O, Farrauto R, Catal. Today, 62(2-3), 249 (2000) 
Liu W, Flytzanistephanopoulos M, J. Catal., 153(2), 304 (1995) 
Liu W, Flytzanistephanopoulos M, J. Catal., 153(2), 317 (1995) 
Kim DH, Cha JE, "A CuO-CeO2 Mixed Oxide Catalyst for CO Slean-up by Selective Oxidation in Hydrogen-rich Mixtures," 9th APCChE Congress, 619 (2002)
Avgouropoulos G, Ioannides T, Matralis HK, Batista J, Hocevar S, Catal. Lett., 73(1), 33 (2001) 
Martinez-Arias A, Fernandez-Garcia M, Soria J, Conesa JC, J. Catal., 182(2), 367 (1999) 
Thormahlen P, Skoglundh M, Fridell E, Andersson B, J. Catal., 188(2), 300 (1999) 
Cunningham DA, Kobayashi T, Kamijo N, Haruta M, Catal. Lett., 25(3-4), 257 (1994) 
Park A, "Fuel Cell Technology(20th & 21st)-Fuel Processors for Fuel Cell Power Systems," 22 (1998)
Tschope A, Liu W, Flytzanistephanopoulos M, Ying JY, J. Catal., 157(1), 42 (1995) 
Wrobel G, Lamenter C, Bennani A, Dhuysser A, Aboukais A, J. Chem. Soc.-Faraday Trans., 91, 99 (1995) 
Wang JB, Lin SC, Huang TJ, Appl. Catal. A: Gen., 232(1-2), 107 (2002)