The I-point method for estimating the surface area of solid catalysts and the variation of C-term of the BET equation

 
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2005 (EN)
The I-point method for estimating the surface area of solid catalysts and the variation of C-term of the BET equation (EN)

Pomonis, P. J. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Pomonis, P. J. (EN)

The BET equation rearranged in the form [V(1 - P)]/P = CVm - (C - 1)[V(1 - P)] was used for the calculation of specific surface areas of porous catalysts and the variation of C-term during the progress of adsorption. This novel method employs plots of [ V(1 - P)]/P vs. [V(1 - P)] which provide inclined-V type lines with an inversion point termed I-point. This I-point corresponds exactly to V(1 - P) = V-m, i.e., the volume of nitrogen necessary for the formation of a monolayer. The slope of the plots corresponds to (C - 1) from which the values of C can be estimated in the whole range 0 < P < 1. As the I-point is approached, the C values approach the C-BET values calculated from the classical linear BET plots. The free energy of adsorption in the whole range 0 < P < 1 can be also estimated from the relationship RTln C. (C) 2004 Elsevier B.V. All rights reserved. (EN)

surface area (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Catalysis Communications (EN)

English

2005

<Go to ISI>://000226479000018

Elsevier (EN)



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