Portal de Periódicos da CAPES

17 The Determination of Pore Structures from Nitrogen Adsorption Isotherms

1957; Elsevier BV; Linguagem: Inglês

10.1016/s0360-0564(08)60163-7

2163-0747

R.W. Cranston, F.A. Inkley,

Hydrocarbon exploration and reservoir analysis

An improved method of deriving pore-size distributions from adsorption isotherms is described which is also believed to provide information on pore shapes. The theory is similar in principle to that of Barrett, Joyner, and Halenda (5), but the method of calculation is more precise. The method provides an estimate of surface area almost independent of the B. E. T. value, and the two values have been compared for a large number of materials including aluminas, silica-aluminas, silicas, and clays. It is shown that the surface area distribution should generally be derived from the adsorption branch of the isotherm and that the above comparison then provides a measure of the validity of the physical assumptions, and hence gives an indication of the character of the pores.