졸-겔법에 의한 헥사알루미네이트의 제조 및 연소특성

백영순; 박성욱; 김형진; 문세기

Journal of the Korean Industrial and Engineering Chemistry, Vol.6, No.6, 1029-1037, December, 1995

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졸-겔법에 의한 헥사알루미네이트의 제조 및 연소특성

Combustion Characterization and Preparation of Hexaaluminate by Sol-Gel Method

백영순, 박성욱, 김형진, 문세기

초록

금속 알콕사이드법에 의해 복합 알콕사이드를 합성하고, sol-gel 법으로 가수분해 반응시켜 얻은 전구체를 소성하여 내열성 바륨 헥사알루미네이트 담체를 만들었다 복합 알콕사이드 합성시 알코올의 종류및 양, 반응시간을 변화시켜 barium hexaaluminate 전구체물성에 미치는 영향을 관찰하였으며, 이 담체에 활성 물질인 전이금속(Mn, La)을 치환시켜 BaMnAl,₁₁O₁₉과 Sr_0.8La_0.2MnAl₁₁O₁₉ 촉매를 만들었다. 담체의 비표면적은 소성온도 1300℃에서 약 24㎡/g의 높은 값을 나타냈으며, 메탄 연소에 대한 활성화 에너지는 BaMnAl₁₁O₁₉촉매의 경우 약 11kcal/mole, Sr_0.8La_0.2MnAl₁₁O₁₉촉매의 경우 약 9kcal/mole을 나타냈다. 이를 사용하여 중.고온용 연소기의 운전범위에서 공간속도와 공연비를 변화시키면서 메탄 연소특성을 수행하였다.

Complex alkoxides were synthesized using metal alkoxide method and were then hydrolyzed to make the precursors using sol-gel method. Factors such as kinds and amounts of alcohols and reaction time which govern the material properties of the barium hexaaluminate precursors were studied. The heats resistant barium hexaaluminate were prepared after the calcination of the precursors. BaMnAl₁₁O₁₉ and Sr_0.8La_0.2MnAl₁₁O₁₉ catalysts were finally yielded by the introduction of active transition metals (Mn, La) into the metals(Ba, Sr) hexaaluminate by substitution. The surface area of the hexaaluminate support was about 24㎡/g at 1300℃ and the activation energy for methane combustion was 11 kcal/mol for BaMnAl₁₁O₁₉ and 9 kca1/mol for Sr_0.8La_0.2MnAl₁₁O₁₉. Based on these catalysts, the characteristics of methane combustion were studied as functions of space velocity and air/fuel ratios in the operational range of mid/high temperature combustors.

[References]

Pfefferle LD, Pfefferle WC, Catal. Rev.-Sci. Eng., 29, 219 (1987)
Oh SH, Mitchell PJ, Siewert RM, J. Catal., 132, 287 (1991)
Burtin P, Appl. Catal., 34, 225 (1987)
Burtin P, Appl. Catal., 34, 239 (1987)
Kato A, Yamashita H, Matsuda S, Stud. Surf. Sci. Catal., 44, 25 (1988)
Voorhoeve RJH, "Advanced Materials in Catalysis," (J.J. Burtonand R.L. Garten, Eds.), 129, Academic Press, New York (1977)
Zhang HM, Shimizu Y, Teraoka Y, Miura N, Yamazoe N, J. Catal., 121, 432 (1990)
Hench LL, West JK, Chem. Rev., 90, 33 (1990)
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Machida M, Eguchi K, Arai H, J. Catal., 120, 377 (1987)
Brinker CJ, J. Non-Cryst. Solids, 100, 31 (1988)
Jubb NJ, Bowen HK, J. Mater. Sci., 22, 1963 (1987)
Shinozaki K, Mizutani N, Lee SK, J. Ceram. Soc. Jpn., 100, 1140 (1989)

[Referenced By]

[1] Pfefferle LD, Pfefferle WC, Catal. Rev.-Sci. Eng., 29, 219 (1987)

[2] Oh SH, Mitchell PJ, Siewert RM, J. Catal., 132, 287 (1991)

[3] Burtin P, Appl. Catal., 34, 225 (1987)

[4] Burtin P, Appl. Catal., 34, 239 (1987)

[5] Kato A, Yamashita H, Matsuda S, Stud. Surf. Sci. Catal., 44, 25 (1988)

[6] Voorhoeve RJH, "Advanced Materials in Catalysis," (J.J. Burtonand R.L. Garten, Eds.), 129, Academic Press, New York (1977)

[7] Zhang HM, Shimizu Y, Teraoka Y, Miura N, Yamazoe N, J. Catal., 121, 432 (1990)

[8] Hench LL, West JK, Chem. Rev., 90, 33 (1990)

[9] Machida M, Eguchi K, Arai H, Chem. Lett., 151 (1987)

[10] Machida M, Eguchi K, Arai H, J. Catal., 120, 377 (1987)

[11] Brinker CJ, J. Non-Cryst. Solids, 100, 31 (1988)

[12] Jubb NJ, Bowen HK, J. Mater. Sci., 22, 1963 (1987)

[13] Shinozaki K, Mizutani N, Lee SK, J. Ceram. Soc. Jpn., 100, 1140 (1989)