Abstract
The sorption isotherms of benzene in CoAlPO4-5 at temperatures of 323–399 K were measured by the gravimetric technique. The sorption capacity and isosteric heat were estimated and interpreted on the basis of the pore topologies of the molecular sieves. The isotherms followed the typical Type-I shape, and could be well fitted with Langmuir and Dubinin-Radushkevich equations. The initial heats of sorption at zero coverage could be well explained by the surface curvature model. The isosteric heats of sorption varied with the coverage, which may suggest a shift of molecular packing manner in the sorbed phase.
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References
Chen, N.Y., T.F. Degnan, and J.C.M. Smith, Molecular Transport and Reaction in Zeolites-Design and Application of Shape Selective Catalysis, VCH, p. 175, New York, 1994.
Chiang, A.S.T., C.K. Lee, and Z.H. Chang, "Adsorption and Diffusion of Aromatics in AlPO4-5," Zeolites, 11, 380-386 (1991).
Choudhary, V.R. and D.B. Akolekar, "Site Energy Distribution and Catalytic Properties of Microporous Crystalline AlPO4-5," J. Catal., 103(1), 115-125 (1987).
Choudhary, V.R., D.B. Akolekar, A.P. Singh, and S.D. Sansare, "Sorption Properties of Crystalline Molecular Sieves AlPO4-5," J. Catal., 111, 23-40 (1988).
de Mallmann, A., S. Dzwigaj, and D. Barthomeuf, "Interaction of Benzene or Ethylbenzene with Zeolites Y and AlPO4-5," Zeolites: Facts, Figures, Future, P.A. Jacobs and R.A. van Santen (Eds.), Stud. Surf. Sci. Catal., 49, 935-943 (1989).
Derouane, E.G., "The Energetic of Sorption by Molecular Sieves: Surface Curvature Effects," Chem. Phys. Lett., 142, 200-204 (1987).
Fan, W.B., R.A. Schoonheydt, and B.M. Weckhuysen, "Hydrothermal Synthesis of Co-rich CoAPO-5 Molecular Sieves," Phys. Chem. Chem. Phys., 3, 3240-3246 (2001).
Flanigen, E.M., B.M. Lok, R.L. Patton, and S.T. Wilson, "Aluminophosphate Molecular Sieves and the Periodic Table, New Developments in Zeolite Science and Technology," Y. Murakami, A. Lijima, and J.W. Ward (Eds.), Stud. Surf. Sci. Catal., 28, 103-112 (1986).
Hartmann, M. and L. Kevan, "Transition-metal Ions in Aluminophosphate and Silicoaluminophosphate Molecular Sieves: Location Interaction with Adsorbates, and Catalytic Properties," Chem. Rev., 99, 635-664 (1999).
Kurshev, V., L. Kevan, D.J. Parillo, C. Pereira, G.T. Kokotailo, and R.J. Gorte, "An Investigation of Framework Substitution of Cobalt into Aluminophosphate-5 Using Electron Spin Resonance and Temperature-Programmed Desorption Measurements," J. Phys. Chem., 98, 10160-10166 (1994).
McCullen, S.B., P.T. Reischman, and D.H. Olson, "Hexane and Benzene Adsorption by Aluminophosphates and SSZ-24: The Effect of Pore Size and Molecular Sieves Composition," Zeolites, 13, 640-644 (1993).
Newalkar, B.L., R.V. Jasra, V. Kamath, and G.T. Bhat, "Sorption of n-Pentane, 2-Methylbutane and Cyclopentane in Microporous AlPO4-5," Micro. Mater., 11, 195-205 (1997).
Newalkar, B.L., R.V. Jasra, V. Kamath, and G.T. Bhat, "Sorption of C6 Alkanes in Aluminophosphate Molecular Sieves, AlPO4-5," Adsorption, 5, 345-357 (1999).
Ribeiro, F.R., F. Alvarez, C. Henriques, F. Lemos, J.M. Lopes, and M.F. Ribeiro, "Structure-activity relationship in zeolites," J. Mol. Catal. A, 96, 245-270 (1995).
Santilli, D.S., T.V. Harris, and S.I. Zones, "Inverse shape selectivity in molecular sieves: Observations, modelling, and predictions," Micro. Mater., 1, 329-341 (1993).
Stach, H., K. Fiedler, and J. J¨anchen, "Correlation between Ini-tial Heats of Adsorption and Structural Parameters of Molecular Sieves with Different Chemical Composition-A Calorimetric Study," Pure & Appl. Chem., 65, 2193-2200 (1993).
Talu, H., C.J. Guo, and D.T. Hayhurst, "Heterogeneous Adsorp-tion Equillibria with Comparable Molecule and Pore Sizes," J. Phys.Chem., 93, 7294-7298 (1989).
Thamm, H., "Calorimetric Study on the State of Aromatic Molecules Sorbed on Silicalite," J. Phys. Chem., 91, 8-11 (1987).
Thomas, J.M., R. Raja, G. Sankar, and R.G. Bell, "Molecular-sieve Catalysts for the Selective Oxidation of Linear Alkane by Molecular Oxygen," Nature, 398, 227-229 (1999).
Uytterhoeven, M.G. and R.A. Schoonheydt, "Diffuse Reflectance Spectroscopy of Cobalt in Wet and Dry Gels for Probing the Synthesis of CoAPO-5 and CoAPO-34," Micro. Mater., 3, 265-279 (1994).
Wilson, S.T., C.A. Lok Messina, T.R. Cannan, and E.M. Flanigen, "Aluminophosphate Molecular Sieves: A New Class of Microporous Crystalline Inorganic Solids," J. Am. Chem. Soc., 104, 1146-1147 (1982).
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Liu, J., Dong, M., Sun, Z. et al. Sorption of Benzene in CoAlPO4-5 Molecular Sieves. Adsorption 10, 205–210 (2004). https://doi.org/10.1023/B:ADSO.0000046356.48581.1b
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DOI: https://doi.org/10.1023/B:ADSO.0000046356.48581.1b