Module configuration in CO2 capture using Pd-based composite membranes

In this study, the effect of module configuration on the performance of Pd-based membrane devices was examined using a Pd-Au composite membrane deposited on a porous nickel support. Hydrogen permeation flux, recovery, and CO2 enrichment were experimentally examined using two different modules. The module configuration that had a narrower space between the surface of the membrane and cover plate provided a large linear flow velocity of the gas mixture, which allowed for a reduction in the concentration polarization. The CO2 enrichment capacity of the membrane module with a space distance of 0.4 mm was 4 times higher than the module with a space distance of 2.5 mm. In regards to the process design, the membrane with an effective area of 16.6 cm2 could enrich 40% of the CO2 at a flow rate of 2000 ml min−1 up to 87% with a hydrogen recovery ratio of >90% at 673 K and a total feed pressure of 1600 kPa.

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► The concentration polarization was reduced by module configuration.
► CO2 could be captured from 60% H2 mixture with Pd-based composite membrane.
► Hydrogen recovery of >90% could be achieved at 673 K and ΔP 1600 kPa.
► CO2 could be enriched up to 87% with a feed flow rate of 2000 ml min−1 in a membrane area of 16.6 cm2.