In situ IR studies of superoxide species on the BaF2/La2O3 catalyst

PHYS 346

Lihua Wang, wanglihua92036@sina.com1, Xiaodong Yi2, Weizheng Weng2, and Huilin Wan2. (1) College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007, China, (2) Xiamen University, Xiamen, 361005, China
The BaF2/La2O3 catalyst was characterized by in situ IR spectroscopy. By using the in situ IR spectroscopy, the superoxide species (O2-), was detected on the BaF2/La2O3 catalyst at temperatures up to 973 K. The introduction of 18O2 isotope caused the 1118 cmボ1 peak to shift to lower wavenumbers (1086 cmボ1 and 1051 cmボ1), consistent with the assignment of the spectra to the superoxide species. A good correlation between the rate of the disappearance of the O2ボ species and that of the formation of C2H4 was observed, demonstrating that O2ボ was the active oxygen species responsible for the oxidative coupling of methane (OCM) on the BaF2/La2O3 catalyst.
 

Physical Chemistry Poster Session
7:00 PM-9:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Physical Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007