| Issue |
Korean Journal of Chemical Engineering,
Vol.10, No.3, 164-168, 1993
Vol.10, No.3, 164-168, 1993
EFFECTS OF SODIUM HYDROXIDE TREATMENT ON COORDINATION CHANGES OF COBALT IONS IN CoNaY BY MEANS OF UV/VIS DIFFUSE REFLECTANCE SPECTROSCOPY
The coordination changes of Co2+ in CoNaY/NaOHs, prepared by cobalt ion-exchange and treatment with NaOH, during dehydration at various temperatures have been investigated by UV/VIS diffuse reflectance spectroscopy. After dehydration of CoNaY/NaOHs at 473 K, the DRS bands show the formation of mixed cobalt oxide species interacted with lattice oxygen. This mixed cobalt oxide species interacted with lattice oxygen decompose during further dehydration at 673 K. The strong intensities of the bands at 660, 575 and 530 nm after dehydration of CoNaY/NaOHs at 873 K indicate that a considerable amount of the cobalt ions remains in the sodalite cage with tetrahedral coordination even after dehydration at 873 K.
[References]
- Maes A, Cremers A, J. Chem. Soc.-Faraday Trans., 71, 265, 1975
- Schoonheydt RA, Vandanne LJ, Jacobs PA, Uytterhoeven JB, J. Catal., 43, 292, 1976
- Uytterhoeven JB, Acta Phys. Chim., 24, 53, 1978
- Kim JC, Woo SI, Appl. Catal., 39, 107, 1988
- Suzuki M, Tsutsumi K, Takahashi H, Saito Y, Zeolites, 9, 38, 1989
- Zhang Z, Wong TT, Sachtler WMH, J. Catal., 128, 13, 1991
- Homeyer ST, Sachtler WMH, "Zeolites: Facts, Figures, Future," Jacobs, P.A. and vanSanten, R.A., ed., Elsevier, p. 975, 1989
- Suzuki M, Tsutsumi U, Takahashi H, Zeolites, 2, 87, 1982
- Egerton TA, Hagan A, Stone FS, Vickerman JC, J. Chem. Soc.-Faraday Trans., 68, 723, 1972
- Han JD, Woo SI, J. Chem. Soc.-Faraday Trans., 88, 145, 1992
- Kho DJ, Chung JS, Kim YG, J. Chem. Soc.-Chem. Commun., 13, 849, 1991
- Yun HG, Woo SI, Chung JS, Appl. Catal., 68, 97, 1991
- Kazansky VB, Zaitsev AV, Borovkov VY, Lapidus AL, Appl. Catal. A: Gen., 40, 17, 1988
- McClory M, Gonzalez RD, J. Catal., 89, 392, 1984
- Han JD, Woo SI, Korean J. Chem. Eng., 8, 235, 1991
- Diegruber H, Plath PJ, "Metal Microstructures in Zeolites," Jacobs, P.A., ed., Elsevier, p. 23, 1982
- Ashley JH, Mitchell PCH, J. Chem. Soc., 2821, 1968
- Cotton FA, Goodgame DML, Goodgame M, J. Am. Chem. Soc., 83, 4690, 1961
- Hutta PJ, Lunsford JH, J. Chem. Phys., 66(10), 4716, 1977
- Cotton FA, Wilkinson G, "Advanced Inorganic Chemistry," 4th ed., John Wiley & Sons, New York, p. 766, 1980
- Uytterhoeven JB, Schoonheydt R, J. Catal., 13, 425, 1969
- Budavari S, O'Neil MJ, "The Merck Index," 11th ed., Merck & Co., Inc., Rahway, 1989
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