| http://www.w3.org/ns/prov#value | - ntains metal cations chosen from alkali metals and alkaline-earth metals, transition metals and lanthanides, preferably lithium, calcium, sodium or potassium; the gas is air; the gas is a mixture containing H2 and CO, or other compounds; at least one of the gases chosen from oxygen, hydrogen, CH4, CO, CO2 or nitrogen is produced; at least one impurity of the group formed by H2O, CO2, NxOy and unsa
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