Effect of pore dimensions

The remarkable effect of pore dimensions and structural properties on zeolite efficiency is further confirmed in the acylation of veratrole... 

Effect of Pore Dimensions, Particle Size, and Surface Area... 

There were no effects of pore dimension on the deactivation rates (due to coke formation) of fresh catalyst over the range investigated. Further studies of deactivation rates after one and two hours of utilization at 205 C also revealed no influence on pore structure. This would rule out intraparticle mass transport as controlling deactivation rates as well as the occurrence of any pore blockage resulting from coking in this reaction. 

Nuclear magnetic resonance (NMR) provides a powerful method for the study of molecular motion. The techniques can distinguish molecular reorientation and translation and have proved particularly valuable for the study of self-diffusion in bulk liquids. The molecular motion of liquids in the confined geometry provided by their containment in porous materials has been of considerable interest for many years. It is of importance both as a fundamental scientific problem and because of its technological importance in such diverse systems as oil recovery from rocks and catalytic agents. The purpose of this paper is to question the reliability of many previous investigations and the validity of their interpretation. Potential sources of error are demonstrated by measurements on mobile liquids adsorbed into porous silicas with different geometrical characteristics. The principles illustrated are equally valid for other porous systems. Preliminary measurements of the diffusion coefficient of n-butane in silica as a fimction of temperature and the effect of pore dimensions are presented. 

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See also in sourсe #XX -- [ , ]

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