The role of II-La2O2CO3 for the oxidative coupling of methane (OCM) was examined by determining the reactivity for the C and O atoms of the (CO3)2- groups of II-La2O2CO3. 18O- and 13C-labeled materials were prepared for these studies. During OCM, the C atoms in the catalyst were the source of 46% of the CO2 produced. No C atoms originating in the catalyst appeared in the hydrocarbon products. The O atoms present in the (CO3)2- layers of the catalyst also appeared in CO2 and CO during OCM. 18O accounted for 48.5% of all oxygen detected in carbon dioxide produced over 18O-labeled phases. Oxygen exchange was observed to occur with O2 in the feed.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry