|Budget Amount *help
¥2,800,000 (Direct Cost : ¥2,800,000)
Fiscal Year 1998 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1997 : ¥2,100,000 (Direct Cost : ¥2,100,000)
The Cu-supported MCM-41 (impregnation, Cu/MCM-41 ; ion-exchange ; Cu-NaMCM-41, Cu-HMCM-41) was prepared using MCM-41 and Al-containing MCM-41 (NaMCM-41, HMCM-41) as supports by both the impregnation and ion-exchange methods. The Cu-supported MCM-41, together with the Cu catalysts supported in zeolites and amorphous oxides, were used as catalysts for the liquid-phase oxidation of benzene. The Cu ion-exchanged HMCM-41 (Cu-HMCM-41) had the highest catalytic activity for phenol formation among the catalysts in this study. Hydrogen peroxide was found to accumulate during the benzene oxidation catalyzed by the Cu-supported MCM-41.
The V supported oxides were found to catalyze the liquid-phase oxygenation of benzene to phenol using O2 as an oxidant and ascorbic acid as a reductant. The V catalyst (V/SiO_2) supported on SiO_2, among various inorganic oxides investigated as a support, had a high catalytic activity for phenol formation. The influences of the V amount impregnated, the amount of ascorbic acid, and the concentration of CH_3COOH in the solvent on the yield of phenol were investigated. The formation of H_2O_2 was observed during the benzene oxidation catalyzed by V/SiO_2 and the amount of the formed H_2O_2 was found to be closely related to the yield of phenol. The electronic absorption spectra of the homogeneous filtrate including V species, leached from the V/SiO_2 catalyst in the aqueous acetic acid solvent containing ascorbic acid, confirmed the presence of H_2O_2 formed in the filtrate.