A surface thermodynamics approach to modelling single-file adsorption in ultramicroporous materials

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Rui Afonso (Author) Other; Luís Gales (Author) ICBAS; Adélio Mendes (Author) FEUP

Journal

Title: Microporous and Mesoporous Materials

Vol. 225

Pages: 543-551

ISSN: 1387-1811

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

ISI Web of Science

Scopus - 2 Citations

INSPEC

Scientific classification

CORDIS: Technological sciences

Associated Projects

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Other information

Authenticus ID: P-00K-6M4

DOI: 10.1016/j.micromeso.2016.01.041

Abstract (EN): A new thermodynamic approach is proposed to interpret adsorption equilibrium in ultramicropores with single-file adsorption. By considering the adsorbed phase as a one-dimensional fluid, phase equilibria thermodynamics can be used to derive a one-dimensional analogue of the monocomponent Gibbs adsorption isotherm. Equations such as Langmuir, Volmer, FowlereGuggenheim or Hillede Boer can thus be used as representations of phenomenological models of the one-dimensional adsorption system, rather than just as mathematical correlations. The bidirectional relation between the equations of state characterising the adsorbed phase and the adsorption isotherm equations allow great insight to be had simply by adsorption isotherm determination. In order to show the potential and limitations of this approach, the adsorption isotherms of Xe and CO2 in four crystalline hydrophobic dipeptides of the VAclass are analysed with this approach. It was possible to assess that adsorbateeadsorbate interactions are relevant for adsorption of both species, being attractive for Xe and repulsive for CO2; Xe adsorption is mainly distributed while CO2 adsorption is mainly localised

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9