Pure hydrogen generation in a fluidized-bed membrane reactor: Experimental findings

Steam reforming of biogas mixtures with a palladium membrane reactor system

“…The maximal flow rate of hydrogen permeated was 2 cm 3 /min at a reaction pressure of 0.5 MPa. In comparison, steam reforming of methane rich natural gas (95.5% of methane) at 823 K with palladium membranes enhances methane conversion compared to that without hydrogen permeation (Mahecha-Botero et al, 2008). In this study, low conversion of methane to hydrogen probably caused small hydrogen formation.…”

“…By removing hydrogen as it is formed in reaction side to permeation side through a membrane, a hydrogen permeable palladium membrane reactor can shifts the equilibrium of above equations to the right hand side, that is, a favorable direction in hydrogen production. Mahecha-Botero et al (2008) studied hydrogen generation during steam reforming of methane at 823 K with a fluidized-bed and combined membrane reactor. The modeling of membrane reactor for hydrogen permeable membrane has also been studied (Caravella et al, 2008;Gallucci et al, 2006).…”

Hydrogen production by steam reforming of natural gas and other nonrenewable feedstocks

“…No trace of CO was detected in the permeate hydrogen even at temperatures of 630 C using Pd membranes. Also, stable performance in the reactor was obtained over 260 h. Mahecha-Botero et al (2008) concluded that the overall performance of the reactor primarily depended on the area of the installed membrane. Hydrogen permeate purity was up to 99.994%, with an H 2 /CH 4 yield of 3.03 with the full membrane and under steam reforming conditions.…”

“…Reprinted with permission from Chen, Z., Po, F., Grace, J. R., Lim, C. J., Elnashaie, S.,Mahecha-Botero, A., et al (2008). Sorbent-enhanced/membrane-assited steam-methane reforming.…”

Solution Precursor Plasma Spray (SPPS) technique of catalyst coating for hydrogen production in a single channel with cavities plate type methanol based microreformer

“…Therefore, to match the requirements of lower CO concentration in the reformed gas, an additional CO clean-up unit can be employed. The CO concentration can be reduced to 10 ppm or lower levels through a membrane separator (i.e., a thin layer of palladium-silver alloy) [3]. The integration of partial-oxidation or water-gas shift reaction equipment to reduce CO concentration in the reformed gas can also be employed.…”