CO OXIDATION ON LaCoO<SUB>3</SUB> PEROVSKITE

Rhee CK; Lee HI

Korean Journal of Chemical Engineering, Vol.11, No.1, 48-54, January, 1994

CO OXIDATION ON LaCoO₃ PEROVSKITE

A study of CO oxidation on LaCoO₃ perovskite was performed in an ultrahigh vacuum system by means of adsorption and desorption. All gases were adsorbed at ambient temperature. Two adsorption states(α-and β-)of CO exist. The α-peak at 440K is attributed to carbonyl species adsorbed on Co³⁺ ions while the β-peak at 663 K likely comes from bidentate carbonate formed by adsorption on lattice oxygens. CO₂ shows a single desorption peak(β-state, 483 K) whose chemical state may be monodentate carbonate. A new CO₂ desorption peak at 590 K can be created by oxidation of CO. O₂ also shows two adsorption states. One desorbs at 600 K, which may reflect adsorption on Co³⁺ ions. The other apparently incorporates with bulk LaCoO₃ and desorbs above 1000K. The two adsorption states of CO are oxidized via different mechanisms. The rate determining step in oxidation of α-CO is the surface reaction whereas for that of β-CO, it is desorption of product CO₂.

[References]

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[Referenced By]

[1] Shelef M, Catal. Rev.-Sci. Eng., 11, 1 (1975)

[2] Egelhoff WF, "The Chemical Physics of Solid Surfaces and Heterogeneous Catalysis," Vol. 4, Eds. King, D.A. and Woodruff, D.P., Elsevier Scientific, New York, p. 424 (1982)

[3] Libby WF, Science, 171, 499 (1971)

[4] Pedersen La, Libby WF, Science, 176, 1355 (1972)

[5] Voorhoeve RJH, Remeika JP, Freeland PE, Mattias BT, Science, 177, 353 (1972)

[6] Voorhoeve RJH, Remeika JP, Johnson DW, Science, 180, 62 (1973)

[7] Schlatter JC, Klimisch RL, Taylor KC, Science, 179, 798 (1973)

[8] Yao YFY, J. Catal., 36, 266 (1975)

[9] Voorhoeve RJH, Johnson DW, Remeika JP, Gallagher PK, Science, 195, 827 (1977)

[10] Gallagher PK, Johnson DW, Vogel EM, Schrey F, Mater. Res. Bull., 10, 623 (1975)

[11] Gallagher PK, Johnson DW, Remeika JP, Schrey F, Trimble LE, Vogel EM, Voorhoeve RJH, Mater. Res. Bull., 10, 529 (1975)

[12] Lauder A, Chem. Eng. News, 53, 8 (1975)

[13] Johnson DW, Gallagher PK, Schrey F, Rhodes WW, Ceram. Bull., 55, 520 (1976)

[14] Gregg SJ, Sing KSW, "Adsorption, Surface Area and Porosity," 2nd ed., Academic Press, New York, p. 62 (1982)

[15] Richter L, Bader SD, Brodsky MB, Phys. Rev., B, Condens. Matter, 22, 3059 (1980)

[16] Crespin M, Hall WK, J. Catal., 69, 359 (1981)

[17] Tascon JMD, Tejuca LG, J. Chem. Soc.-Faraday Trans., 77, 591 (1981)

[18] Seah MP, "Practical Surface Analysis," Eds. Briggs, D. and Seah, M.P., John Wiley & Sons, Ltd., New York, p. 203 (1983)

[19] Kojima I, Adachi H, Yasumori I, Surf. Sci., 130, 50 (1983)

[20] Habenschaden E, Kuppers J, Surf. Sci., 138, L147 (1984)

[21] Prior Ka, Schwaha K, Lambert RM, Surf. Sci., 77, 193 (1978)

[22] Bridge ME, Comrie LM, Lambert RM, J. Catal., 58, 28 (1979)

[23] Tascon JMD, Tejuca LG, Z. Phys. Chem., 121, 63 (1980)

[24] Tascon JMD, Tejuca LG, Z. Phys. Chem., 121, 79 (1980)

[25] Yamazoe N, Teraoka Y, Seiyama T, Chem. Lett., 1767 (1981)

[26] Teraoka Y, Zhang HM, Yamazoe N, Chem. Lett., 1367 (1985)

[27] Nakamura T, Misono M, Yoneda Y, Chem. Lett., 1589 (1981)

[28] George S, Viswanathan B, Sastri MVC, Ind. J. Chem., 15A, 285 (1977)

[29] George S, Viswanathan B, J. Colloid Interface Sci., 95, 322 (1983)