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

• Autorzy: Sojka, Z. , Che, M.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

PL

elektronowy rezonans paramagnetyczny; kataliza; molibden; metanol; hydroksymetyl; tlen; przeniesienie elektronu

EN

EPR spectroscopy; catalysis; molybdenum; methanol; hydroxymethyl; oxygen; electron transfer

• Czasopismo: Bulletin of the Polish Academy of Sciences. Chemistry
• Rocznik: 2000
• Tom: Vol. 48, No. 4
• Strony: 313-324
• Opis fizyczny: Bibliogr. 30 poz.

Twórcy

autor

Sojka, Z.

autor

Che, M.

• Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Cracow, Poland (Wydział Chemii, Uniwersytet Jagielloński)