황산처리된 산화철 촉매의 특성

박두선; 이재성

HWAHAK KONGHAK, Vol.28, No.1, 45-51, February, 1990

Export Citation

황산처리된 산화철 촉매의 특성

Characterization of Sulfate Promoted Iron Oxide Catalyst

박두선, 이재성

초록

황산처리된 산화철 촉매(SO₄^2-/Fe₂O₃)를 제조하여 이의 특성을 분석하고 피리딘, 암모니아, n-butane, 1-butene과 같은 흡착질과의 상호작용을 FT-IR을 사용하여 연구하였다. 촉매표면의 SO₄^2- group은 열적으로 500℃까지는 안정하엿으나 고온에서는 SO₂를 방출하며 분해되었다. 이 열처리에 의해 SO₄^2-/Fe₂O₃는 흡착된 물을 잃고, 공유결합성 이중결합인 S=O의 비대칭 신축진동에 의한 1382cm^-1의 강한 흡수피크를 보였다. 이 피크는 모든 흡착질에 대하여 민감하게 변하였으며, 흡착에 의하여 이중결합성을 잃고 낮은 파수 쪽으로 이동하였다. SO₄^2-/Fe₂O₃에는 주로 L-acid site가 관축되었으나, 계에 혼입된 물에 의한 B-acid site도 일부 존재하였다.

A sulfate-promoted iron oxide(SO₄^2-/Fe₂O₃)has been prepared and its properties have been charac-terized. Interactions with various adsorbates such as pyridine, ammonia, n-butane and 1-butene has been investigated by FT-1R. Surface sulfate group in SO₄^2-/Fe₂O₃ was thermally stable up to 500℃, but decomposed to yield gaseous SO₂ at higher temperatures. During the thermal treatment, the sample lost water and showed a strong adsorption band at 1382cm^-1 due to the asymmetric stretching vibration of covalent S=O double bonds. This band was very sensitive to all adsorbates and shifts to lower wave numbers as the bond lost its double bond character by adsorption. Mainly Lewis acid sites were observed on the sample, together with some BrØnsted acid sites generated by water inadvertently introduced into the system.

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[2] Hino M, Arata K, Chem. Lett., 963 (1980)

[3] Tanabe K, Kayo A, Yamaguchi T, J. Chem. Soc.-Chem. Commun., 602 (1981)

[4] Nagase Y, Jin T, Hattori H, Yamaguchi H, Tanabe T, Bull. Chem. Soc. Jpn., 58, 916 (1985)

[5] Surrell MS, Appl. Catal., 34, 109 (1987)

[6] Hino M, Arata K, J. Chem. Soc.-Chem. Commun., 112 (1985)

[7] Tanabe K, "Heterogeneous Catalysis," Shapiro, B.L., Ed., Texas A & M Uni. Press, College Station, TX (1984)

[8] Hino M, Arata K, J. Chem. Soc.-Chem. Commun., 1148 (1979)

[9] Hino M, Arata K, J. Chem. Soc.-Chem. Commun., 851 (1980)

[10] Kayo A, Yamaguchi T, Tanabe K, J. Catal., 83, 99 (1983)

[11] Tanabe K, Hattori H, Yamaguchi T, Yakoyama S, Umeatsu J, Sanada Y, Fuel, 61, 389 (1982)

[12] Jin T, Yamaguchi T, Tanabe K, J. Phys. Chem., 90, 4794 (1986)

[13] Yamaguchi T, Jin T, Tanabe K, J. Phys. Chem., 90, 3148 (1986)

[14] Saur O, Bensitel M, Saad ABM, Lavalley JC, Tripp CP, Morrow BA, J. Catal., 99, 104 (1986)

[15] Marcus RA, Fresco SM, J. Chem. Phys., 27, 564 (1957)

[16] Pimentel GC, McClellan AL, "The Hydrogen Bond," W.H. Feeman and Co. San Francisco, p. 70 (1960)

[17] Kokes RJ, Dent AL, "Advances in Catalysis," H. Pines, ed., Vol. 22, Academic Press, New York (1972)

[18] Lee JS, Park DS, J. Catal., to be published