Abstract
Schoell separated methane from other natural gases by gas chromatography and transferred methane, on-line by a He carrier, to an oxidation device. Water and CO2 from the combustion were trapped and separated cryogenically, and the water was reduced to H2 by methods. CO2 was measured for its C isotopic composition without further preparations. CH4 was separated cryogenically from CO2 in diary cow breath samples. The CH4 was washed in a Ba(OH)2 column and passed, with addition of O2, through the combustion furnace (at 800°C) of an EA, containing Cu2O as oxygen donor. The CO2 from the combustion was purified cryogenically and measured on a mass spectrometry. Kiyosu & Krouse reacted methane with CuO and Fe2O3 (hematite) at a temperature range of 400–650°C. Small silica glass tubes were loaded with dry metal oxide powder and were placed inside a larger silica glass tube, heated by an external resistance furnace. Methane was passed through the heated metal oxide.
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