We present experimental results of an autothermal scaled-down system for H
2 production. Pure atmospheric pressure H
2, separated
in situ by Pd-Ag membranes, is produced by steam reforming (SR) of methane, ethanol or glycerol. The heat is supplied by oxidizing the SR effluents in a separate compartment. While the thermal efficiency observed is~25%, a mathematical model validated by the system predicts that with improved insulation in larger systems and with more membrane area, the efficiency can surpass 60%. This design serves as proof of concept for on-board pure H
2 generators, with flexible fuel source type, feeding an adjacent fuel cell.
In the second part we present simulations of an Internal-Combustion-Engine (ICE) coupled with a methanol steam reformer (MSR), which feeds the ICE and the energy of the exhaust gases is used to sustain the endothermic MSR. The overall energy efficiency is improved by the feed of H2 and CO.
We compare the main challenges of both approaches and the expected efficiencies and convenience of operation.
