Catalytic oxidation process
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Physical adsorption
Molecular Sieves
Room temperature operation
Moderate to low capacity
Significantly affected by partial pressures
Significantly affected by temperatures
Fully reversible with heat and pure gas
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Chemical adsorption
- Catalysts (as adsorbers): Copper, Nickel...
Metals can sorb O2, CO, H2
Support can physisorb H2O and (CO2)
Room temperature operation
Relatively low capacity, not significantly affected by partial pressures
Fully reversible at elevated temperatures
NiO + H2 + Heat = Ni + H2O
- Getters: Zirconium, Vanadium...
Can remove N2, CH4, O2, H2O, CO, H2 and CO2
Heated operation for optimized performance
Relatively high capacity, not significantly affected by partial pressures
Surface Adsorption
Bulk Diffusion
Irreversible process
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Nitrogen >>