An analysis of the physical content of various methods of determining the specific surface of the secondary pores of molded zeolites is given. From experiments on the pressing in of mercury and capillary condensation of benzene, one can calculate the specific surface of the secondary pores on an equivalent model sorbent with the geometrical shape of the pores assumed.
Specific surfaces of the secondary pores of type A molded zeolites and outer surfaces of the zeolite crystals contained in them, close to the actual values, were determined by the use of a highly sensitive gravimetric adsorption setup. The specific surfaces of the secondary pores of molded zeolites are determined basically by the porous structure of the additions of binders.
The specific surfaces of secondary pores for equivalent model porous sorbents, as a rule, are considerably greater than the actual specific surfaces of the secondary pores of real molded zeolites. Hence, the methods of pressing in mercury and capillary condensation of vapors cannot be used for any exact evaluation of the specific surfaces of the secondary pores of molded zeolites.
The basic content of the rational approximated adsorption method for determining the specific surfaces of the secondary pores of molded type A zeolites was substantiated.
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Dubinin, M.M., Betezkina, Y.F., Polstyanov, E.F. et al. Investigation of the adsorption properties and secondary porous structure of adsorbents exhibiting a molecular sieve action Communication 11. Specific surface of secondary pores of molded synthetic type a zeolites. Russ Chem Bull 14, 1701–1708 (1965). https://doi.org/10.1007/BF00850146
- Specific Surface
- Molecular Sieve
- Equivalent Model