Development of a new gas sensor for binary mixtures based on the permselectivity of polymeric membranes - Application to carbon dioxide/methane and carbon dioxide/helium mixtures

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Rosa Rego (Author) Other; Nídia Caetano (Author) FEUP; Adélio Mendes (Author) FEUP

Journal

Title: Analytica Chimica Acta

Vol. 511 No. 2

Pages: 215-221

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 7 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

CORDIS: Technological sciences > Technology > Chemical technology

Other information

Authenticus ID: P-000-AB7

DOI: 10.1016/j.aca.2004.01.048

Abstract (EN): Membrane-based gas sensors were developed and used for determining the composition on bi-component mixtures in the 0-100% range, such as oxygen/nitrogen and carbon dioxide/methane (biogas). These sensors are low cost and are aimed at a low/medium precision market. The paper describes the use of this sensor for two gas mixtures: carbon dioxide/methane and carbon dioxide/helium. The membranes used are poly(dimethylsiloxane) (PDMS) and Teflon-AF hollow fibers. The response curves for both sensors were obtained at three different temperatures. The results clearly indicate that the permeate pressure of the sensors relates to the gas mixture composition at a given temperature. The data is represented by a third order polynomial. The sensors enable quantitative carbon dioxide analysis in binary mixtures with methane or helium. The response of the sensors is fast (less than 50 s), continuous, reproducible and long-term stable over a period of 2.3 x 10(7) s (9 months). The absolute sensitivity of the sensors depends on the carbon dioxide feed concentration ranging from 0.03 to 0.13 MPa.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7