Hollow fibre membrane reactors for high H 2 yields in the WGS reaction

Reference:

García-García, F. R., Torrente Murciano, L., Chadwick, D. and Li, K., 2012. Hollow fibre membrane reactors for high H 2 yields in the WGS reaction. Journal of Membrane Science, 405-406, pp. 30-37.

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Official URL:

http://dx.doi.org/10.1016/j.memsci.2012.02.031

Abstract

Alumina hollow fibres with narrow pore size distribution and high surface area/volume ratio are presented as a cost-effective alternative support for metallic membranes which can potentially ease the large-scale implementation of membrane reactors. In this article, we demonstrate the formation of a defect-free thin (∼5μm) Pd/Ag layer over the smooth outer surface of hollow fibres with high H 2 permeation fluxes (48.41Lm -2h -1 at 450°C and ΔP 0.5 of 1.01atm 0.5) and 100% H 2 perm-selectivity. Their use in hollow fibre membrane reactors (HFMR) allows the selective extraction of H 2 from the reaction medium, especially relevant in H 2-formation equilibrium reactions. Thus, the water-gas shift reaction was used as a proof-reaction. When the HFMR is combined with a highly stable and active nanostructured Pt/CeO 2 catalyst, enhanced selectivities and activities are achieved as a result of the integration of the reaction and separation steps. The best results were obtained at high temperatures (375-525°C) where the thermodynamic equilibrium conversion was exceeded by up to 14%.

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