Partial oxidation of methane on supported potassium molybdate

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1997.1519· OSTI ID:478764

Erdohelyi, A; Fodor, K; Solymosi, F ^[1]

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1. Institute of Solid State and Radiochemistry, Szeged (Hungary)

The partial oxidation of methane to formaldehyde was studied on K{sub 2}MoO{sub 4}, deposited on various supports, in a fixed-bed continuous-flow reactor at 860-923 K using O{sub 2} as oxidant. The catalysts were characterized by Raman and XPS spectroscopies. It was found that the composition of molybdates deposited by impregnation depended sensitively on the pH value of the slurry containing the support. At low pH values a significant amount of K{sub 2}Mo{sub 2}O{sub 7} was formed. The product distribution of the oxidation reaction was markedly influenced by the nature of the support. The highest activity was measured for magnesia-supported catalyst. In this case, however, only the complete oxidation of methane occurred. Formaldehyde, in a larger quantity, was produced on silica-supported catalyst containing a greater amount of K{sub 2}Mo{sub 2}O{sub 7} and on K{sub 2}MoO{sub 4}/ZSM-5. It was observed that at very low oxygen content, {approximately}0.1%, the reaction pathway of methane conversion was basically different: in this case the main hydrocarbon products were ethylene, ethane, and benzene. Formaldehyde was not detected. A possible mechanism for the reaction of methane is discussed. 37 refs., 7 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 478764
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 166; ISSN JCTLA5; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
10 SYNTHETIC FUELS
40 CHEMISTRY
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
METHANE
MOLYBDATES
PARTIAL OXIDATION PROCESSES
PHOTOELECTRON SPECTROSCOPY
POTASSIUM COMPOUNDS
RAMAN SPECTROSCOPY
SILICA
X-RAY SPECTROSCOPY