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1 Bulletin of the Polish Academy of Sciences. Chemistry

1 2000

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Spectroscopic study of hydroxymethyl radicals produced on MoOx/SiO2 catalysts by interaction of methanol with UV-induced [Mo5+--O-] triplet state

Sojka Z., Che M.

Bulletin of the Polish Academy of Sciences. Chemistry

2000

Vol. 48, No. 4

313-324

EPR along with MAS-NMR and QM spectroscopy have been used to investigate the structure and reactivity of hydroxymethyl radicals formed upon UV -irradiation of methanol adsorbed on MoOx /Si0(2) catalysts. The use of natural and 13C-enriched methanol allowed the authors to ascertain the 1 H superhyperfine and 13C hyperfine tensors. Based on the analysis of the magnetic parameters the structure of .CH2OH radical interacting with the catalysts has been determined: it is non-planar and the c- H bonds are stretched. The hydroxymethyl intermediates were found to reduce surface Mo(6+) centers and adsorbed O2 via an electroprotic mechanism involving electron transfer and release of the hydroxyl proton.