Experimental confirmation of the lack of carbon isotope exchange between methane and carbon oxides at high temperatures

Details Experimental confirmation of the lack of carbon isotope exchange between methane and carbon oxides at high temperatures Experimental confirmation of the lack of carbon isotope exchange between methane and carbon oxides at high temperatures

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..273s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, Issue 2, pp.273-276

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No exchange was observed between 1. (1) CH 4 and CO 2 at 500°C for times as long as 136 hr; 2. (2) CH 4 and CO 2 in the presence of a water-containing calcium montmorillonite at 200°C up to 32 days and at 500°C up to 10.5 days; and 3. (3) CH 4 , CO 2 and CO generated during the pyrolysis at 500°C of a natural lignite for times up to 180 hr. These experiments also indicate that the isotopic compositions of CH 4 , CO 2 and CO found in natural environments at temperatures less than 200°C are not regulated by isotopic exchange with one another.

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