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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Rui Afonso (Autor) Outra; Luís Gales (Autor) ICBAS; Adélio Mendes (Autor) FEUP

Revista

Título: Microporous and Mesoporous Materials

Vol. 225

Páginas: 543-551

ISSN: 1387-1811

Editora: Elsevier

Indexação

ISI Web of Knowledge - 2 Citações

ISI Web of Science

Scopus - 2 Citações

INSPEC

Classificação Científica

CORDIS: Ciências Tecnológicas

Projetos Associados

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

Outras Informações

ID Authenticus: 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

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9