Hydrogen purity
Hydrogen purity is the specified minimum hydrogen mole fraction of a gas stream together with limits on named contaminant species.
- Stated as both a hydrogen fraction and per-species contaminant limits.
- Moisture dominates the contaminant profile of PEM output.
- Required purity is set by the downstream duty.
Definition
Hydrogen purity is the specified minimum hydrogen mole fraction of a gas stream together with limits on named contaminant species.
Purity
PEM cells exclude alkaline aerosol by construction, so specifications concentrate on residual water vapour and trace material species.
Production
Maintained by feed-water treatment, resin polishing, gas–liquid separation and drying stages.
Applications
Combustion duty and consumer modality duty define different purity envelopes.
Reference material only. CE Global publishes hydrogen production and PEM electrolysis engineering information. Nothing here is a medical, health, performance, emissions or fuel-saving claim.