| JH2 | Hydrogen flux permeating through the membrane |
| n | Dependence factor of the hydrogen flux on the hydrogen partial pressure |
| PeH2 | Hydrogen permeability |
| pH2,permeate | Hydrogen partial pressures in the permeate zone |
| pH2,retentate | Hydrogen partial pressures in the retentate zone |
| δ | Membrane thickness |
| CMS | Carbon molecular sieve |
| FBR | Fixed bed reactor |
| FC | Fuel cell |
| GHG | Greenhouse gas |
| MR | Membrane reactor |
| MSR | Methanol steam reforming |
| ODE | Ordinary differential equation |
| PDE | Partial differential equation |
| PEMFC | Proton exchange membrane fuel cell |
| PIS | Process intensification strategy |
| PROX | Preferential oxidation |
| PSA | Pressure swing adsorption |
| WGS | Water gas shift |
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