Comparative study between a CMS membrane and a CMS adsorbent: Part I-Morphology, adsorption equilibrium and kinetics

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

Authors

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

Journal

Title: Journal of Membrane Science

Vol. 346

Pages: 15-25

ISSN: 0376-7388

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 28 Citations

ISI Web of Science

Scopus - 34 Citations

COMPENDEX

INSPEC

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Physical sciences > Chemistry > Physical chemistry

Other information

Authenticus ID: P-003-BQ1

DOI: 10.1016/j.memsci.2009.08.045

Abstract (EN): This paper presents a comparative study between a carbon molecular sieve (CMS) membrane and a commercial CMS adsorbent; these materials are suited for selective gas permeation and adsorption-based gas separations, respectively. The purpose of this analysis is to better understand the mass transport mechanism in CMS membranes and how it is related to the material's structure. The structural characterization based on the adsorption Of CO2 at 0 degrees C revealed that the adsorbent has a greater micropore volume, a smaller mean pore width and a micropore size distribution shifted to the left, when compared to the membrane. This translates into a lower adsorption capacity of the membrane towards N-2, Ar, CO2 and O-2 at 29.5 degrees C and 0-7 bar. The adsorption kinetics were also studied and the pressure-dependence of the apparent time constants established; different models were used to predict the experimental results, emphasizing the very important role of the ultramicroporosity on the properties of the materials. The CMS membrane exhibited a pore blockage effect when permeating O-2 and CO2. Further morphologic characterization was performed by SEM, X-ray diffraction and mercury porosimetry.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11