金属改性APO-5分子筛催化对叔丁基甲苯选择氧化合成对叔丁基苯甲醛

Selective Oxidation of p-tert-Butyltoluene to p-tert-Butylbenzaldehyde Over Metal-modified APO-5 Zeolites

摘要:

采用水热法制备了金属离子改性的MAPO-5（M=Co, Mn, Fe）催化剂，考察了其催化对叔丁基甲苯（PTBT）选择性氧化制对叔丁基苯甲醛（PTBA）的性能。结果表明，CoAPO-5具有较好的催化性能，在PTBT 5 g (33.7 mmol)，催化剂0.3 g，过氧化叔丁醇（TBHP）12.2 g (134.8 mmol)，溶剂乙腈18 mL，反应温度70 ℃，反应时间6 h的条件下，PTBT的转化率为15.5%，PTBD的选择性达到73.4%。催化剂重复使用5次后其活性和选择性无显著降低，显示出较好的结构稳定性和重复使用性。

Abstract:

Metal-modified molecular sieves (MAPO-5, M=Co, Mn, Fe) have been hydrothermal synthesized and investigated in the selective oxidation of p-tert-butyltoluene (PTBT) to p-tert-butyltolualdehyde (PTBD). CoAPO-5 exhibited the best catalytic activity. Under the optimized conditions: reaction time 6 h, PTBT 5 g (33.7 mmol), CoAPO-5 0.3 g, tert-butyl hydroperoxide 12.2 g (134.8mmol), acetonitrile 18 mL, reaction temperature 70 ℃, the conversion of PTBT reached to 15.5% with a PTBD selectivity of 73.4%. Recycle runs suggested that CoAPO-5 was stable for at least 5 cycles without obvious changes of catalytic activity and selectivity.