Abstract
The influence of operating conditions (time-on-stream, temperature, pressure and paraffin feed concentration) on the deactivation of a 5A molecular sieve during the adsorption/desorption of n-decane has been studied using a cyclic operating procedure. After 10 adsorption/desorption cycles, the 5A molecular sieve used in this study showed the same deactivation level as an used industrial molecular sieve provided that the deactivation of the zeolite was due to coke deposition by site coverage and pore blockage. The temperature effect was studied in the range of 373–523 K, obtaining a minimum deactivation at 448 K. The pressure does not influence adsorption parameters in the range of 1–3 MPa, but it does affect the nature of the coke deposited on the zeolite. The influence of paraffin concentration can be considered negligible.
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References
Bhatia, S., J. Beltramini, and D.D. Do, “Deactivation of Zeolite Catalysts,” Catal. Rev. Sci. Eng., 31(4), 431-480 (1989).
Bibby, D.M. et al., “Coke Formation in High Silica Zeolites-a Review,” Appl. Catal., 93, 1-34 (1992).
Bonilla, M., “Regeneración y caracterización de tamices moleculares 5A,” Ph.D. Thesis, Chemical Engineering Department, Complutense University of Madrid, Spain, 1992.
Broughton, D.B., “Molex: Case History of a Process,” Chem. Eng. Prog., 64(8), 60-64 (1968).
Conly, R.T., Infrarred Spectroscopy, Alhambra, Madrid, 1979.
Díaz, J.A., “Desactivación de tamices moleculares 5A en procesos de adsorción en fase líquida,” Ph.D. Thesis, Chemical Engineering Department, Complutense University of Madrid, Spain, 1997.
Guisnet, M. and P. Magnoux, “Coking and Deactivation of Zeolites. Influence of Pore Structure,” Appl. Catal., 54, 1-27 (1989).
Langner, B.E., “Coke Formation and Deactivation of the Catalyst in the Propylene on Calcined NaNH4-Y,” Ind. Eng. Chem. Proc. Des. Dev., 20, 326-331 (1981).
Magnoux, P., F. Machado, and M. Guisnet, “Coke Formation During the Transformation of Propene, Toluene and Propene-Toluene Mixtures on HZSM-5,” Stud. Surf. Sci. Catal., 75, 435-447 (1993).
Magnoux, P., C. Roger, and M. Guisnet, “New Technique for the Characterization of Carbonaceous Compounds Responsible for Zeolite Deactivation,” Stud. Surf. Sci. Catal., 34, 317-330 (1987).
Menon, P., “Coke on Catalysts-Harmful, Harmless, Invisible and Beneficial Types,” J. Mol. Catal., 59, 207-220 (1990).
Ruthven, D.M., Principles of Adsorption Processes, Wiley-Interscience, New York, 1984.
Silverstein, R., G. Bassier, and T. Morril, Identificación espectrométrica de compuestos orgánicos, Ed. Diana, México, 1980.
Sotelo, J.L., M.A. Uguina, J.L.Valverde, and D.P. Serrano, “Kinetics of Toluene Alkylation with Methanol Over Mg-Modified ZSM-5,” Ind. Eng. Chem. Res., 32, 2548-2554 (1993).
Sotelo, J.L., M.A. Uguina, J.L. Valverde, and D.P. Serrano, “Deactivation of Toluene Alkylation with Methanol Over Magnesium-Modified ZSM-5. Shape Selectivity Changes Induces by Coke Formation,” Appl. Catal. A, 114, 273-285 (1994).
Sotelo, J.L., M.A. Uguina, J.L. Valverde, and D.P. Serrano, “Deactivation Kinetics of Toluene Alkylation with Methanol Over Magnesium-Modified ZSM-5,” Ind. Eng. Chem. Res., 35, 1300-1306 (1996).
Uguina, M.A., D.P. Serrano, R. Van Grieken, and S. Venés, “Adsorption, Acid and Catalytic Changes Induced in ZSM-5 by Coking with Different Hydrocarbons,” Appl. Catal. A, 99, 97-113 (1994).
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Uguina, M., Sotelo, J., Calleja, G. et al. Effects of the Operating Conditions on Coke Deactivation of 5A Molecular Sieve in N-Decane Adsorption/Desorption. Adsorption 8, 133–140 (2002). https://doi.org/10.1023/A:1020430417911
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DOI: https://doi.org/10.1023/A:1020430417911