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Performance of a Pd/PSS membrane reactor to produce high purity hydrogen via WGS reaction

pubblicazioni - Articolo

Performance of a Pd/PSS membrane reactor to produce high purity hydrogen via WGS reaction

In this work, the performance of the WGS reaction conducted in a membrane reactor based on a membrane supported Pd (20 uM) were investigated experimentally in terms of CO conversion, recovery and purity of the hydrogen in the permeate. By submitting a mixture costituta from 8% CO, 32% H2O, 24% CO2, 36% H2 and a GHSV = 3450 h-1, at 390 ° C and a pressure of 11 bar is reached a conversion of 80% CO approximately, a hydrogen recovery of 70% and a purity of 97%. The fouling of the membrane due to the deposition of coke on the surface is reversible, in fact, after 700 hours of reaction, the permeation and the ideal selectivity of hydrogen remained unchanged.

In this work, the performance of WGS reaction carried out in a porous stainless steel (PSS) supported Pd-based membrane reactor (MR) have been experimentally investigated in terms of conversion, hydrogen recovery and hydrogen purity of permeate stream. A 20 m thick Pd-based membrane prepared by electroless plating and a high temperature Fe-Cr based WGS catalyst have been used during the experimental campaign. Influence of parameters such as reaction pressure (from 7 to 11 bar) and gas space hourly velocity, GHSV (from 3450 to 14000 h-1), at different steam to carbon ratio (from 1/1 to 4/1) have been investigated at the reaction temperature of 390 °C. As a best result of this work, by supplying a hydrogen rich-gas mixture such as 8% CO, 32% H2O, 24% CO2, 36% H2 to the MR operated at GHSV = 3450 h-1 and reaction pressure of 11 bar, almost 80% CO conversion, 70% hydrogen recovery with hydrogen permeate purity around 97% have been reached. Membrane fouling due to coke coverage on the membrane surface has been proven to be fully reversible: after 700 hours of tests in WGS mixtures, H2 permeation and both H2/He and H2/N2 ideal selectivities remained unchanged.

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