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New Method for Calculating Slit - Shaped Pore Size In Solids from Adsorption Isotherm
Pages: 110-113
Year: Issue:  1
Journal: Journal of Donghua University(English Edition)

Keyword:  porous solidsphysical adsorptionsurfacethermodynamicsslit-shaped mesoporepore size.;
Abstract: <正>Assuming the pores in a porous solid to be slit-shaped,according to the principle of surface chemical thermody-namics,an equation for the calculation of pore size fromthe desorption branch of the isotherm of physical adsorp-tion of nitrogen on the porous solid at liquid nitrogentemperature is derived.The calculation results obtainedby different methods,namely,the classical method,BBmethod and the method of this paper,are compared.Comparison shows that the pore sizes d_T and d_H calculat-ed by the method of this paper and BB method respec-tively are larger than the pore size d_c calculated by theclassical method in the range 0<p/p_s<1;d_T>d_Hatp/p_s<0.71 and d_H>d_T at p/p_s>0.71;The results byBB method and the method of this paper tend to be thesame as that by the classical method while p/p_s ap-proaches 1.
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