Partial oxidation of methane over supported molybdenum
Conference
·
· Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)
OSTI ID:5998152
Steady-state activity (percent conversion) and selectivity for the Mo/silica gel catalyzed oxidation of methane to CH/sub 3/OH and CH/sub 2/O by N/sub 2/O in the presence of steam at 600/sup 0/C have been measured in order to define reaction kinetics and the mechanism of molybdenum catalysis. Both selective and non-selective oxidation occur in this system, the latter yielding carbon monoxide and carbon dioxide. Conversion yields of CH/sub 2/O are independent of H/sub 2/O partial pressure but selectivity for CH/sub 3/OH formation increases with increasing H/sub 2/O partial pressure. The rate law for CH/sub 4/ consumption is complex, being determined by non-selective oxidation and reduction reactions. Spectroscopic evidence indicates that the catalytic role of molybdenum involves a cyclic oxidation state change from the +5 state and back vial the +6 state. Tritiation occurs by the N/sub 2/O oxidation of Mo/sup V/ to yield (Mo/sup VI/O/sup -/) which either reacts with CH/sub 4/ to yield (Mo/sup V/(OCH/sub 3/)/sup -/) or is further reduced to (Mo/sup VI/O/sup -2/). The latter complex requires CH/sub 4/ for reduction to Mo/sup V/ in a non-selective process yielding CO/sub 2/ and H/sub 2/O.
- Research Organization:
- Texas A and M Univ., College Station
- OSTI ID:
- 5998152
- Report Number(s):
- CONF-830303-
- Conference Information:
- Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 28:3
- Country of Publication:
- United States
- Language:
- English
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· J. Phys. Chem.; (United States)
·
OSTI ID:6367930
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·
OSTI ID:6745339
Retention of structural cores in the synthesis of high-nuclearity polyoxoalkoxomolybdate clusters encapsulating [Na(H{sub 2}O){sub 3}]{sup +} and [MoO{sub 3}] moieties. Hydrothermal syntheses and structures of (NH{sub 4}){sub 7}[NaH{sub 12}Mo{sub 16}O{sub 52}]{center_dot}4H{sub 2}O and (Me{sub 3}NH){sub 4}K{sub 2}[H{sub 14}Mo{sub 16}O{sub 52}]{center_dot}8H{sub 2}O and their structural relationships to the class of superclusters [XH{sub n}Mo{sub 42}O{sub 109}((OCH{sub 2}){sub 3}CR){sub 7}]{sup m{minus}} (X = Na(H{sub 2}O){sub 3}{sup +}: n=13, m=9; n=15, m=7. X = MoO{sub 3}: n = 14, m=9; n=13, m=10)
Journal Article
·
Tue Mar 26 23:00:00 EST 1996
· Inorganic Chemistry
·
OSTI ID:264064
Related Subjects
03 NATURAL GAS
033000 -- Natural Gas-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ADSORBENTS
ALCOHOLS
ALDEHYDES
ALKANES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
ELEMENTS
FORMALDEHYDE
HIGH TEMPERATURE
HYDROCARBONS
HYDROXY COMPOUNDS
KINETICS
METALS
METHANE
METHANOL
MOLYBDENUM
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
REACTION KINETICS
REDOX REACTIONS
SILICA GEL
SPECTROSCOPY
STEAM
STOICHIOMETRY
TRANSITION ELEMENTS
VALENCE
YIELDS
033000 -- Natural Gas-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ADSORBENTS
ALCOHOLS
ALDEHYDES
ALKANES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
ELEMENTS
FORMALDEHYDE
HIGH TEMPERATURE
HYDROCARBONS
HYDROXY COMPOUNDS
KINETICS
METALS
METHANE
METHANOL
MOLYBDENUM
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
REACTION KINETICS
REDOX REACTIONS
SILICA GEL
SPECTROSCOPY
STEAM
STOICHIOMETRY
TRANSITION ELEMENTS
VALENCE
YIELDS