The production of hydrogen through the use of a 77 wt% Pd 23 wt% Ag membrane water gas shift Reactor

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dc.contributor.authorBaloyi, Liberty N.
dc.contributor.authorNorth, Brian C.
dc.contributor.authorLangmi, Henrietta W.
dc.contributor.authorBladergroen, Bernard J.
dc.contributor.authorOjumu, Tunde V.
dc.date.accessioned2018-05-22T11:21:10Z
dc.date.available2018-05-22T11:21:10Z
dc.date.issued2016
dc.description.abstractHydrogen as an energy carrier has the potential to decarbonize the energy sector. This work presents the application of a palladium-silver (PdeAg) membrane-based reactor. The membrane reactor which is made from PdeAg film supported by porous stainless steel (PSS) is evaluated for the production of hydrogen and the potential replacement of the current two stage Water-Gas Shift (WGS) reaction by a single stage reaction. The permeability of a 20 mm PdeAg membrane reactor was examined at 320 _C, 380 _C and 430 _C. The effect of continuous hydrogen exposure on the PdeAg membrane at high temperature and low temperature was examined to investigate the thermal stability and durability of the membrane. During continuous operation to determine thermal stability, the membrane reactor exhibited stable hydrogen permeation at 320 _C for 120 h and unstable hydrogen permeation at 430 _C was observed. For the WGS reaction, the reactor was loaded with Ferrochrome catalyst. The membrane showed the ability to produce high purity hydrogen, with a CO conversion and an H2 recovery of 84% and 88%, respectively. The membrane suffered from hydrogen embrittlement due to desorption and adsorption of hydrogen on the membrane surface. SEM analysis revealed cracks that occurred on the surface of the membrane after hydrogen exposure. XRD analysis revealed lattice expansion after hydrogen loading which suggests the occurrence of phase change from a-phase to the more brittle b phase.en_US
dc.description.accreditationDHET
dc.identifier.citationBaloyi, Liberty N. et al (2016). The production of hydrogen through the use of a 77 wt% Pd 23 wt% Ag membrane water gas shift reactor South African Journal of Chemical Engineering, 22: 44-54 https://doi.org/10.1016/j.sajce.2016.11.001en_US
dc.identifier.issn1026-9185
dc.identifier.urihttps://doi.org/10.1016/j.sajce.2016.11.001
dc.identifier.urihttp://hdl.handle.net/10566/3718
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherElsevieren_US
dc.rightsThis is the author version of the article published online at: https://doi.org/10.1016/j.sajce.2016.11.001
dc.status.ispeerreviewedTRUE
dc.subjectPalladium-Silveren_US
dc.subjectHydrogen Permeationen_US
dc.subjectHydrogen Fluxen_US
dc.subjectWater-Gas Shift Reaction: Membraneen_US
dc.titleThe production of hydrogen through the use of a 77 wt% Pd 23 wt% Ag membrane water gas shift Reactoren_US
dc.typeArticleen_US

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