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Evaluation of the Water Gas Shift Reaction in a Palladium Membrane Reactor

pubblicazioni - Articolo

Evaluation of the Water Gas Shift Reaction in a Palladium Membrane Reactor

L’articolo verte sui risultati ottenuti nell’attività RdS PAR2009 relativa alla prove di Water Gas Shift con reattore a membrana per la separazione dell’idrogeno.

The water gas shift (WGS) reaction of a syngas mixture has been carried out in a tubular palladium membrane reactor at a temperature of 410-414°C. A composite palladium-porous stainless steel membrane, 29 micron thick, obtained by electroless plating, has been first extensively tested with pure gases (H2, He, CO2) and syngas mixtures in the 310-455°C temperature range and up to 800 kPa. Long-term stability of the membrane in H2 at 400°C has also been checked over a period of 1200 hours. The membrane has been then used for WGS tests in a membrane reactor. The membrane reactor, packed with a pulverized Fe/Cr commercial catalyst, has been operated at a reaction pressure of 100-600 kPa in the counter-current mode, with a nitrogen sweep-gas. The reactor has been fed with a shift gas mixture with a 7.6% CO concentration and H2O/CO ratio in the 2.7-3.6 range. The membrane reactor was able to achieve up to the 85.0 % of CO conversion, while only the 37% as a maximum, was reached with the traditional reactor in the same operating conditions. Up to the 82% of hydrogen has been recovered with a purity exceeding the 97%.

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