The introduction of tetrachloromethane (TCM) into the feedstream of CO
and O-2 inhibits the formation of CO2 on hydroxyapatite. TCM interact
s with the surface of hydroxyapatite to form its chlorinated analogue,
chlorapatite, which suppresses the oxidation of CO to CO2. Thus, in t
he oxidative coupling of methane the beneficial effects of the additio
n of TCM to the feedstream result, at least in past, from the suppress
ion of the further oxidation of CO.