| 초록 |
Methanol was directly produced by partial oxidation of methane with mixed oxide catalysts. Mixed oxide catalysts were prepared by co-precipitation and sol-gel methods. In the preparation of the catalysts by the sol-gel method, various hydrolysis ratios were used such as 5/1, 10/1 and 15/1. The effects of hydrolysis ratio, pressure and reactants ratio on conversion and methanol selectivity were investigated. The prepared catalysts were characterized by XRD, BET, O2-TPD and SEM. The highest methanol selectivity with Mo-Bi-Cr-Si catalyst prepared by sol-gel method was 26.7% at 420℃. With increasing hydrolysis ratio, particle sizes decreased and surface areas increased. The catalyst prepared by sol-gel method shows higher methanol selectivity than those prepared by co-precipitation method. From the O2-TPD experiments, it was found that the Mo-Bi-Cr-Si catalyst prepared by sol-gel method provides more lattice oxygen than the catalyst prepared by co-precipitation method. |
