Journal of the Chemical Society - Faraday Transactions p. 293 - 299 (1996)
Update date:2022-08-29
Topics:
Sugiyama, Shigeru
Minami, Toshimitsu
Hayashi, Hiromu
Tanaka, Michie
Shigemoto, Naoya
Moffat, John B.
The oxidation of methane on the stoichiometric hydroxyapatite Ca10(PO4)6(OH)2 (HAP) has been examined in the presence and absence of tetrachloromethane (TCM). In contrast to the previously observed effects of TCM on the oxidation of methane with other catalysts, the introduction of a small amount of TCM into the feedstream with stoichiometric HAP produced an increased selectivity to carbon monoxide and a decreased conversion of methane with increasing time-on-stream. The selectivity to C2 compounds changed relatively little on addition of TCM. X-Ray analysis showed that the chlorided species was formed not only on the surface but also in the bulk phase and, at least in the latter, was identified as chlorapatite Ca10(PO4)6Cl2. Pretreatment experiments, in which the hydroxyapatite was exposed to a mixture of O2 and TCM before use in the methane conversion process, showed that the chlorinated surface formed by this method possessed distinctly different catalytic properties from that produced during the methane conversion process in the presence of feedstream TCM.
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