Methane activation by the lanthanide oxides: (1987 progress report, Part A)

Technical Report · Wed Dec 31 23:00:00 EST 1986

OSTI ID:6510429

Campbell, K D; Zhang, H; Lunsford, J H

The catalytic production of gas phase methyl radicals from methane over the lanthanide oxides was measured using a matrix isolation electron spin resonance (MIESR) technique. Results show that metal centers with multiple stable oxidation states are not a requirement for activity. The oxide with the greatest activity per gram was hydrothermally treated La/sub 2/O/sub 3/, which was ca. 5 times more active than the next highest oxide. Hydrothermally treated La/sub 2/O/sub 3/ and Sm/sub 2/O/sub 3/ have the largest activities per m/sup 2/. Results obtained in a conventional flow reactor for selected oxides incidate that the CH/sub 4/ conversions per m/sup 2/ are in the order Nd/sub 2/O/sub 3/ > La/sub 2/O/sub 3/ > Sm/sub 2/O/sub 3/ > Dy/sub 2/O/sub 3/ > CeO/sub 2/. Oxidative coupling of CH/sub 4/ results in C/sub 2/H/sub 6/ and C/sub 2/H/sub 4/ (C/sub 2/ compounds), and the combined C/sub 2/ yields follow the same order with Dy/sub 2/O/sub 3/ >> CeO/sub 2/. The MIESR and flow reactor results are in qualitative agreement, with the exception of Nd/sub 2/O/sub 3/.

• Research Organization: Texas A and M Univ., College Station (USA). Dept. of Chemistry
• DOE Contract Number: AS05-76ER05226
• OSTI ID: 6510429
• Report Number(s): DOE/ER/05226-5A; ON: DE87010951
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
ALKYL RADICALS
CATALYSTS
CATALYTIC EFFECTS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
HYDROCARBONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
METHANE
METHYL RADICALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RADICALS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SAMARIUM OXIDES