Partial oxidation of methane to carbon monoxide and hydrogen with molecular oxygen and nitrous oxide over hydroxyapatite catalysts
- Osaka National Research Institute (Japan)
- Univ. of Waterloo, Ontario (Canada)
Hydroxyapatites catalyze the partial oxidation of methane to carbon monoxide and hydrogen with molecular oxygen at a reaction temperature as low as 600[degrees]C. The predominant reactions can be stoichiometrically represented as CH[sub 4] + O[sub 2] [yields] CO[sub 2] + 2H[sub 2] and CH[sub 4] + O[sub 2] [yields] CO + H[sub 2] + H[sub 2]O. The former reaction is mainly catalyzed over stoichiometric apatite and the latter proceeds over the nonstoichiometric form. With oxygen as oxidant the H[sub 2]/CO[sub x] ratios produced are strongly dependent on the Ca/P ratio in the hydroxyapatite while with nitrous oxide little or no hydrogen is formed. With nitrous oxide as oxidant the active species on the hydroxyapatite are apparently capable of extracting hydrogen from methane, while in the presence of oxygen the active sites appear to interact directly with the carbon atoms. Rate data and infrared spectra of the apatite samples suggest that new sites, which are formed from P[sub 2]O[sub 7][sup 4-] present in nonstoichiometric apatite, are responsible for the selective formation of carbon monoxide. 40 refs., 8 figs., 4 tabs.
- OSTI ID:
- 7034749
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 148:1; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALKANES
APATITES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
HYDROGEN
KINETICS
METHANE
MINERALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHOSPHATE MINERALS
REACTION KINETICS
SPECTROSCOPY