TY - JOUR
T1 - On concentration polarisation in a fluidized bed membrane reactor for biogas steam reforming
T2 - modelling and experimental validation
AU - de Nooijer, Niek
AU - Gallucci, Fausto
AU - Pellizzari, Emma
AU - Melendez, Jon
AU - Pacheco Tanaka, David Alfredo
AU - Manzolini, Giampaolo
AU - van Sint Annaland, Martin
PY - 2018/9/15
Y1 - 2018/9/15
N2 - The production of pure hydrogen through the steam reforming of biogas in a fluidized bed membrane reactor has been studied. A phenomenological one-dimensional two-phase fluidized bed reactor model accounting for concentration polarisation with a stagnant film model has been developed and used to investigate the system performance. The validation of the model was performed with steam reforming experiments at temperatures ranging from 435 °C up to 535 °C, pressures between 2 and 5 bar and CO2/CH4 ratios up to 0.9. The permeation performance of the ceramic-supported PdAg thin-film membrane was first characterized separately for both pure gas and gas mixtures. Subsequently, the membrane was immersed into a fluidized bed containing Rh supported on alumina particles and the reactor performance, viz. the methane conversion, hydrogen recovery and hydrogen purity, was evaluated under biogas steam reforming conditions. The resulting hydrogen purity under biogas steam reforming conditions was up to 99.8%. The model results were in very good agreement with the experimental results, when assuming a thickness of the stagnant mass transfer boundary layer around the membrane equal to 0.54 cm. It is shown that the effects of concentration polarisation in a fluidized bed membrane reactor can be well described with the implementation of a film layer description in the two-phase model.
AB - The production of pure hydrogen through the steam reforming of biogas in a fluidized bed membrane reactor has been studied. A phenomenological one-dimensional two-phase fluidized bed reactor model accounting for concentration polarisation with a stagnant film model has been developed and used to investigate the system performance. The validation of the model was performed with steam reforming experiments at temperatures ranging from 435 °C up to 535 °C, pressures between 2 and 5 bar and CO2/CH4 ratios up to 0.9. The permeation performance of the ceramic-supported PdAg thin-film membrane was first characterized separately for both pure gas and gas mixtures. Subsequently, the membrane was immersed into a fluidized bed containing Rh supported on alumina particles and the reactor performance, viz. the methane conversion, hydrogen recovery and hydrogen purity, was evaluated under biogas steam reforming conditions. The resulting hydrogen purity under biogas steam reforming conditions was up to 99.8%. The model results were in very good agreement with the experimental results, when assuming a thickness of the stagnant mass transfer boundary layer around the membrane equal to 0.54 cm. It is shown that the effects of concentration polarisation in a fluidized bed membrane reactor can be well described with the implementation of a film layer description in the two-phase model.
KW - Biogas
KW - Hydrogen production
KW - Membrane reactor
KW - Steam reforming
UR - http://www.scopus.com/inward/record.url?scp=85046703024&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2018.04.205
DO - 10.1016/j.cej.2018.04.205
M3 - Article
AN - SCOPUS:85046703024
VL - 348
SP - 232
EP - 243
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -