Characterization of Porous Solids II, 2nd Edition by F. Rodriguez-Reinoso, J. Rouquerol, K. S. W. Sing

By F. Rodriguez-Reinoso, J. Rouquerol, K. S. W. Sing

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2) Tempcrature: higher temperature (90 K) caused the transition to move to a lower relative pressure. 3) Polarizability of the sorbing gas: argon has no permanent dipole and showed no hysteresis. Venero and Chiou (ref. 9) measured sorption isotherms over ZSM-5, CaA and NaY zeolites using both nitrogen at 77K and argon at 86K. They found that argon gave more accurate predictions of pore sizes of physical mixtures of zeolites than nitrogen. Sorption in micropores can occurs by condensation (refs.

2. 5K. The inset shows the initial Henry’s law region. ,. 5 Fig. 3. 5K. The dotted line shows the adsorption on a plane surface. 0 Fig. 4. 5K. The dotted line shows the adsorption on a plane surface. Coverage is in units of incommensurate monolayers on the plane surface + ..... e&.. P 1 , 5 f5 25 35 Io * P / ~ ~ 45 16 solid-like monolayer, (as judged by the very low free energy calculated from the pressure virial (4)). There is then a transition to the filled state. The upper branch remains stable over a wide range of pressure.

10-11). rather than by multilayer physisorption. Condensation in pores less than 20 8, corresponds to less than 5 sorbent molecules between the pore walls. The Kelvin model is inappropriate for modelling sorption since an equilibrium phase, with continuum properties of surface tension and molar volume, does not exist. The critical parameter controlling the sorption isotherm in micropores is the ratio of pore size/molecule size. The effect of packing of sorbed molecules may be important. The volume of sorbed molecules alone will underestimate the pore volume simply due to the manner in which the sorbed molecules pack in the condensed phase.

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