Comparative study between a CMS membrane and a CMS adsorbent: Part II. Water vapor adsorption and surface chemistry

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Campo, MC (Author) Other; Lagorsse, S (Author) Other; Magalhaes, FD (Author) FEUP; Mendes, A (Author) FEUP

Journal

Title: Journal of Membrane Science

Vol. 346

Pages: 26-36

ISSN: 0376-7388

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 10 Citations

COMPENDEX

INSPEC

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Physical sciences > Chemistry > Physical chemistry > Surface chemistry ; Physical sciences > Chemistry > Physical chemistry

Other information

Authenticus ID: P-003-BQ2

DOI: 10.1016/j.memsci.2009.09.004

Abstract (EN): The adsorption/desorption equilibria of water vapor in a carbon molecular sieve (CMS) membrane and a commercial CMS adsorbent were determined, exhibiting S-shaped, type V isotherms. The fits of several models found in the literature to the experimental data were evaluated. The results obtained led to the development of a new model accounting for both adsorption and desorption and essentially based on the work of Lagorsse et al. (2005) [15]. Furthermore, the adsorption kinetics was also assessed for both materials and well described by a linear driving force model. The existence of hydrophilic groups responsible for water vapor adsorption in such carbonaceous materials has been related to the surface chemistry by means of X-ray microanalysis and by thermogravimetry. it was concluded from X-ray microanalyses that the carbon membrane presents a lower C/O ratio and is thus more sensitive towards water vapor exposure, as evidenced by the measured water adsorption at lower relative pressures. It was also observed that the diffusion rates are higher for the CMS membrane than for the CMS adsorbent.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11