1-06　固体 ¹⁷O MAS NMR法を用いた低温酸化炭に含まれる酸素官能基の直接観測

抄録

To observe oxygen functional groups generated during oxidation reaction, coal was treated at 40–120 degree C under ¹⁷O₂ atmosphere. Solid state ¹⁷O MAS NMR spectra of the oxidized coal were acquired by using Oldfield Echo pulse sequence. Since the ¹⁷O MAS NMR spectrum acquired by Single Pulse sequence suffered from distortion caused by ringing phenomenon, the Oldfield Echo pulse sequence was used to eliminate the spectral distortion. As a result, two kinds of oxygen functional groups generated by oxidation were observed. Furthermore, these areas of ¹⁷O NMR spectra became large as oxidation temperature was high, indicating that the amount of oxygen functional groups increased with an increase of oxidation temperature.