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TEMPERATURE-PROGRAMMED DESORPTION STUDY OF MOLECULAR OXYGEN ADSORBED ON MFI-TYPE EOLITES
Korean Journal of Chemical Engineering, September 1998, 15(5), 566-569(4), 10.1007/BF02707112
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Abstract
The adsorption of molecular oxygen at room temperature on the proton form of MFI zeolites with different Si/Al ratios has been investigated by temperature-programmed desorption (TPD). The internal Si-OH defects (silanol groups) in these zeolites are found to serve as O2) adsorption sites. The apparent activation energies (17.5-21.8kcal·mol-1) of desorption determined from O2 YPD measurements reveal that the extent of interactions between the Si-OH defects and the adsorbed O2 molecules becomes weaker with decreasing Al content in the zeolite.
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Chezeau JM, Delmotte L, Guth GL, Soulard M, Zeolites, 9, 78 (1989)
Corma A, Chem. Rev., 95(3), 559 (1995)
Cvetanovic RJ, Amenomiya Y, Adv. Catal., 17, 103 (1967)
Dessau RM, Schmitt KD, Kerr GT, Woolery GL, Alemany LB, J. Catal., 104, 484 (1987)
Engelhardt G, Michel D, "High-Resolution Solid-State NMR of Silicates and Zeolites," Wiley, Chichester (1987)
Farneth WE, Gorte RJ, Chem. Rev., 95(3), 615 (1995)
Hong SB, Kim SJ, Uh YS, J. Am. Chem. Soc., 118(34), 8102 (1996)
Jacobs PA, Martens JA, "Synthesis of High-Silica Aluminosilicate Zeolites," Elsevier, Amsterdam (1987)
Kim SJ, Kim MH, Hong SB, Uh YS, Choi YS, Catal. Lett., 44(3-4), 165 (1997)
Moser WR, Thompson RW, Chiang CC, Tong H, J. Catal., 117, 19 (1989)
Pauling L, "The Nature of the Chemical Bond," Cornell University Press, Ithaca, 3rd ed. (1974)
Pine LA, Maher PJ, Wachter WA, J. Catal., 85, 466 (1984)
Venuto PB, Microporous Mater., 2, 297 (1994)
Woolery GL, Alemany LB, Dessau RM, Chester AW, Zeolites, 6, 14 (1986)
