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Received July 5, 2002
Accepted September 11, 2002
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Tackling the Problem of Sulfur Poisoning of Perovskite Catalysts for Natural Gas Combustion
Dipartimento di Scienza dei Materiali e Ingegneria Chimica-Politecnico di Torino, Corso Duca degli Abruzzi, 24-10129 Turin, Italy
ilaria.rosso@polito.it
Korean Journal of Chemical Engineering, March 2003, 20(2), 222-229(8), 10.1007/BF02697232
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Abstract
LaMn0.5Mg0.5O3ㆍy MgO and LaCr0.5-xMnxMg0.5O3ㆍy MgO catalysts (x=0-0.25, y=0-17) were prepared, characterized (XRD, BET, SEM-EDS, TEM, FTIR, chemical and atomic absorption analyses), tested for high-temperature methane combustion and aged in presence of SO2 to investigate sulfur effect on catalytic activity. Different roles of manganese and chromium in the perovskite structure have been assessed: (i) manganese improves the activity of catalysts in the fresh state, whereas chromium worsens it; (ii) owing to its basic nature, manganese makes_x000D_
perovskites more prone to adsorb SO2 and so less resistant to sulfur poisoning, whereas chromium, owing to its acidic nature, has opposite effects; (iii) the partial solubility of chromium oxide in basic media renders Cr-catalyst regeneration by NH3 leaching less effective. MgO promotes catalytic activity of fresh LaCr0.5Mg0.5O3ㆍy MgO catalysts and slows down sulfur poisoning of LaMn0.5Mg0.5O3ㆍy MgO and LaCr0.25Mn0.25Mg0.5O3ㆍ17 MgO catalysts only.
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References
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Cerri I, Saracco G, Geobaldo F, Specchia V, Ind. Eng. Chem. Res., 39(1), 24 (2000)
Cerri I, Saracco G, Specchia V, Trimis D, Chem. Eng. J., 82(1-3), 73 (2001)
Ciambelli P, Cimino S, De Rossi S, Lisi L, Minelli G, Porta P, Russo G, Appl. Catal. B: Environ., 29(4), 239 (2001)
Collongue B, Garbowski E, Primet M, J. Chem. Soc.-Faraday Trans., 87, 2493 (1991)
Farrauto RJ, Heck RM, Catal. Today, 51(3-4), 351 (1999)
Garten RL, DallaBetta RA, Schlatter JC, "Catalytic Combustion," Handbook of Heterogeneous Catalysis, Ertl, G., Knozinger, H., Weitkamp, J., eds., VCH, Weinheim (1997)
Klvana D, Kirchnerova J, Gauthier P, Delval J, Chaouki J, Can. J. Chem. Eng., 75(3), 509 (1997)
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Pfefferle LD, Pfefferle WC, Catal. Rev.-Sci. Eng., 26, 219 (1987)
Rosso I, Garrone E, Geobaldo F, Onida B, Saracco G, Specchia V, Appl. Catal. B: Environ., 30(1-2), 61 (2001)
Rosso I, Garrone E, Geobaldo F, Onida B, Saracco G, Specchia V, Appl. Catal. B: Environ., 34(1), 29 (2001)
Saracco G, Geobaldo F, Baldi G, Appl. Catal. B: Environ., 20(4), 277 (1999)
Saracco G, Scibilia G, Iannibello A, Baldi G, Appl. Catal. B: Environ., 8(2), 229 (1996)
Seiyama T, Catal. Rev.-Sci. Eng., 34, 281 (1992)
Trimm DL, Appl. Catal., 7, 249 (1984)
Wan L, "Poisoning of Perovskite Oxides by Sulphur Dioxide," Properties and Applications of Perovskite-Type Oxides, Tejuca L.G., Fierro, J.L.G. (Eds.), Dekker, New York (1993)
Zwinkels MFM, Jaras SG, GovinMenon P, Catal. Rev.-Sci. Eng., 35, 319 (1993)
