The sorption and diffusion properties of methanol vapor in membranes of equivalent weight 860 gpol/(mol(SO3H) were investigated at different activities and at temperatures between 35 and 65°C. The solubility isotherms can be well represented by a BET-type of equation as a function of the penetrant activity. The molar uptake of methanol, at fixed activity, is compared to that of water in the same membrane and thermal range. The diffusivity increases with temperature and shows a maximum with concentration, similarly to what observed in the case of water vapor diffusion.
The methanol transport properties of a PFSI membrane for proton exchange fuel cells (PEM FCs) / De Angelis M.G.; Giacinti Baschetti M.; Sarti G.C.. - ELETTRONICO. - (2010), pp. 1-8. (Intervento presentato al convegno CHISA 2010 (19th Int. Cong. of Chemical and Process Engineering) -ECCE 7 (7th European Congress of Chemical Engineering) - CD ROM of Full Texts tenutosi a Praga nel 28 Agosto- 1 Settembre 2010).
The methanol transport properties of a PFSI membrane for proton exchange fuel cells (PEM FCs)
DE ANGELIS, MARIA GRAZIA;GIACINTI BASCHETTI, MARCO;SARTI, GIULIO CESARE
2010
Abstract
The sorption and diffusion properties of methanol vapor in membranes of equivalent weight 860 gpol/(mol(SO3H) were investigated at different activities and at temperatures between 35 and 65°C. The solubility isotherms can be well represented by a BET-type of equation as a function of the penetrant activity. The molar uptake of methanol, at fixed activity, is compared to that of water in the same membrane and thermal range. The diffusivity increases with temperature and shows a maximum with concentration, similarly to what observed in the case of water vapor diffusion.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
