Pt-Sn/γ-Al<sub>2</sub>O<sub>3</sub> 촉매상에서 n-Heptane의 탈수소고리화 반응에서 조촉매 주석의 영향

송명석; 김문찬; 김경림

Journal of the Korean Industrial and Engineering Chemistry, Vol.2, No.4, 411-420, December, 1991

Export Citation

Pt-Sn/γ-Al₂O₃ 촉매상에서 n-Heptane의 탈수소고리화 반응에서 조촉매 주석의 영향

The Effect of Sn on Dehydrocyclization of n-Heptane over Pt-Sn/γ-Al₂O₃ Catalyst

송명석, 김문찬, 김경림

초록

Pt-Sn/γ-A1₂O₃ 촉매에서 조촉매 주석의 함량을 달리하여 n-heptane을 반응물로 사용하여 탈수소 고리화 반응을 고정층 연속 흐름 반응기에서 행하였다. 조작 조건의 범위는 온도 450-550℃, 압력 20×10⁵-50×10⁵Pa, 접촉 시간 0.09-0.27 hr, H₂/H.C. 몰비는 10이었다. 온도는 증가함에 따라 탈수소고리화반응의 전화율과 선택도가 증가했으며 압력의 증가에 대해서는 그 반대의 결과를 나타냈다. 조촉매 주석을 사용하였을 때 탈수소고리화반응의 선택도는 큰 변화를 보이지 않았지만 전화율이 증가했으며 이성화반응의 선택도는 커다란 증가를 보였다. 0.6 wt % Pt-0.6 wt % Sn/γ-A1₂O₃ 촉매에서 n-heptane의 탈수소 고리화 반응의 활성화에너지는 34.5kcal/mole 이었다.

The dehydrocyclization of n-heptane was studied over Pt-Sn/γ-A1₂O₃ catalysts with varying Sn content in a fixed bed continuous flow reactor. The range of experimental conditions was at the temperature between 450 and 550 ℃, the pressure 20×10⁵ and 50×10⁵ Pa, the contact time 0.09 and 0.27 hr and the H₂/H.C. mole ratio 10. The conversion and selectivity of dehydrocyclization increased with increasing temperature, but decreased with increasing pressure. When we use Sn as a promoter, the selectivity of dehydrocyclization changesa a little, but the conversion was increased and the selectivity of isomerization increased a lot. The activation energy of dehydrocyclization of n-heptane was 34.5 kcal/mol over 0.6 wt % Pt-0.6 wt % Sn/γ-Al₂O₃.

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[2] Hansch C, Chem. Rev., 53, 253 (1953)

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[4] Kim GR, Lee WM, Chem. Ind. Technol., 3(4), 425 (1985)

[5] Barron Y, J. Catal., 5, 428 (1966)

[6] Cerveny L, "Catalytic Hydrogenation," 1st ed., Elsevier, N.Y., 150 (1986)

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[8] Ginette L, J. Catal., 1, 99 (1986)

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[10] 이언석, 김경림, 산업기술연구소 논문 (1986)

[11] Frennet A, Catal. Rev.-Sci. Eng., 10, 37 (1974)

[12] Gates BC, Katzer JR, Schuit GCA, "Chemistry of Catalytic Processes," McGraw-Hill (1979)

[13] Ciapetta FG, Wallace DN, Catal. Rev.-Sci. Eng., 5, 67 (1972)

[14] Dautzenberg FM, Platteew JC, J. Catal., 19, 41 (1970)

[15] Rasser J, Beindorff WH, Scholten JJF, J. Catal., 9, 211 (1979)

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