Structural characterization of porous carbonaceous materials using high-pressure adsorption measurements

Youssef Belmabkhout, M. Frère*, G. De Weireld

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The aim of this work is to present a new method for porous carbonaceous solids characterization: the pore size distribution function (PSDF) of the adsorbent is determined by a theoretical treatment applied to adsorption data. The measurements are performed with different adsorbates at different temperatures in a wide pressure range. The theoretical model is based on the concept of integral adsorption equation (IAE). The main assumptions of the model are: (1) The PSDF is considered as an intrinsic property of the adsorbent. (2) The slit shaped pore model is used to describe the geometric configuration of the porous structure. (3) The adsorbent-adsorbate interactions are described by a Lennard-Jones potential model. (4) The pore wall surface is considered to be energetically homogeneous and the adsorbed phase is monolayer. (5) Both the gas phase and the adsorbed phase are supposed to be efficiently described by a Redlich-Kwong type equation of state. (6) We assumed a priori the analytical form of the pore size distribution function. We used adsorption isotherms of nitrogen, oxygen, argon and methane on different carbonaceous solids (four activated carbons and one molecular sieve) at 283 K, 303 K and 323 K and for pressures up to 2200 kPa.

Original languageEnglish (US)
Pages (from-to)113-120
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume160
StatePublished - Jan 1 2007

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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