금속 산화물 촉매를 이용한 메탄의 Oxidative Coupling 반응

김형진; 편무실; 박홍수; 함현식

Journal of the Korean Industrial and Engineering Chemistry, Vol.4, No.4, 807-813, December, 1993

Export Citation

금속 산화물 촉매를 이용한 메탄의 Oxidative Coupling 반응

Oxidative Coupling of Methane by Metal Oxide Catalysts

김형진, 편무실, 박홍수, 함현식

초록

메탄의 직접 전환 기술 중 하나인 OCM(oxidative coupling of methane) 반응을 수행하였다. 사용한 금속 산화물 촉매는 Li/MgO와 Pb/MgO이었다. 온도에 따른 촉매의 반응성을 알아보기 위해 600, 700, 800℃에서 반응을 행하였으며, 반응물 혼합비(메탄:산소)에 따른 반응성, 전환율 및 선택도를 알아보기 위해 700℃에서 혼합비를 2:1 및 1:1로 하여 실험을 하였다. 그 결과 7wt% Li/MgO 촉매의 경우 반응온도 700℃이고 혼합비가 2:1일 때 메탄의 전환율과 C₂화합물의 선택도가 각각 20%, 65% 정도로서 우수한 반응성을 보임을 알 수 있었다. 7wt% Ll/MgO 촉매의 경우 700℃에서 혼합비가 1:1일 때 메탕의 전환율은 30%로 증가했으나 C₂화합물의 선택도는 45%로 감소하였다. Pb/MgO 촉매는 Li/MgO 보다 낮은 선택도를(25%) 나타내었다.

Oxidative coupling of methane(OCM), one of the methods of direct methane conversion, was performed. Metal oxide catalysts used were Li/MgO and Pb/MgO. To investigate the reactivity of the catalysts with temperature, the reaction was carried out at 600, 700 and 800 ℃; and to investigate the effect of the feed ratio of the reactants(CH4:O2) on reactivity, conversion, and selectivity the reaction was performed at 700 ℃ with the feed ratio of 2:1 and 1:1. The results indicate that 7wt% Li/MgO catalyst is a good catalyst for OCM reaction with 20% conversion and 65% selectivity at 700 ℃ with the feed ratio of 2:1. As feed ratio was 1:1, methane conversion was increased to 30% while C2 selectivity decreased to 45% at 700 ℃ with 7wt% Li/MgO catalyst. The Pb/MgO catalyst showed less selectivity(25%) than Li/MgO did.

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[2] Baerns M, Ross JRH, "Perspectives in Catalysis," The IUPAC Monograph (1991)

[3] 박상언, 장종산, 촉매, 7, 32 (1991)

[4] Edwards JH, Do KT, Tyler RJ, "Methane Conversion by Oxidative Processes," pp. 429 ~ 462, New York (1992)

[5] Foster NR, Appl. Catal., 19, 1 (1985)

[6] Pitchai R, Klier K, Catal. Rev.-Sci. Eng., 28, 13 (1986)

[7] Wolf EE, "Methane Conversion by Oxidative Processes," pp. 527 ~ 540, New York (1992)

[8] Kuo JCW, "Engineering Evaluation of Direct Methane Conversion Processes, Methane Conversion by Oxidative Processes," pp. 483 ~ 526, New York (1992)

[9] Keller GE, Bhasin MM, J. Catal., 73, 9 (1982)

[10] Hinsen W, Baerns M, Chem. Ztg., 107, 223 (1983)

[11] Ito T, Lunsford JH, Nature, 314, 721 (1985)

[12] Driscoll DJ, Lunsford JH, J. Phys. Chem., 87, 301 (1983)

[13] Driscoll DJ, Lunsford JH, J. Phys. Chem., 89, 4415 (1985)

[14] Ito T, Wang JX, Lin CH, Lunsford JH, J. Am. Chem. Soc., 107, 5062 (1985)

[15] Kharas KCC, Lunsford JH, J. Am. Chem. Soc., 111, 2336 (1989)