Fluid A is most preferably in gaseous form and is most preferably either hydrogen; a hydrocarbon such as CH4, C2H6, or C3H8 at preferably 100-200??? C.; an alcohol such as methanol or C2H4(OH)2 at preferably 20-80??? C.; H2S at preferably 20-90??? C.; a nitrogen derivative such as NH2NH2 at preferably 20-60??? C.; or ammonia at preferably 200-400??? C. Fluid B is preferably oxygen gas.