酸碱固体催化剂上丙酮气相缩合异佛尔酮

Gas-phase acetone condensation of isophorone with acid-base solid catalyst

采用浸渍法制备酸碱复合固体催化剂,考察其在丙酮气相缩合生成异佛尔酮反应中的催化活性,并采用BET、SEM对催化剂的结构进行表征.结果表明,在Al2O3上负载MgO有催化活性,用适量KOH对催化剂载体进行改性可有效抑制副产物均三甲苯的生成.当载体经过w(KOH)=2.5%改性处理并负载w(MgO)=30%时,MgO大部分可均匀分散在载体表面,催化剂比表面积较大,催化剂活性较高,丙酮的转化率和异佛尔酮的选择性分别为13.4%和33.0%.

Acid-base compound solid catalysts were prepared by impregnation method, their catalytic ac- tivity in the reaction of gas-phase acetone condensation of isophorone was investigated, and the structure of the catalysts was characterized by means of BET and SEM. The results showed that the catalyst of MgO on the acid carrier Al2 O3 would have catalytic activity for acetone condensation of isophorone and the generation of by-product of mesitylene could be efficiently restrained with proper amount of KOH loaded on the catalyst carrier. The catalyst with w（KOH）=2. 5% and w（MgO）=30% showed high catalytic activity and most MgO could disperse uniformly on the surface of the carrier. The specific area of the catalyst was larger, the activity of the catalyst was higher, and the conversion rate of acetone and selectivity of iso- phorone were 13.4% and 33.0%, respectively.