双金属催化剂Bi-Mo/TiO_2气相催化氧化2-甲基吡啶合成2-吡啶甲醛

Gas-Phase Oxidation of 2-Picoline to Synthesize 2-Pyridylaldehyde Using Bi-Mo/TiO_2 Dual-Metal Catalysts

制备了气相催化氧化2-甲基吡啶合成2-吡啶甲醛的双金属Bi-Mo/TiO_2催化剂,采用XRD、H_2-TPR、SEM和XPS对催化剂进行了表征,并考察了催化剂组成、反应温度、原料流率等因素的影响。实验研究结果表明,Bi-Mo/TiO_2对2-甲基吡啶有比较高的催化活性是基于Bi_2Mo_3O_(12)和MoO_3的协同催化作用,Bi2Mo_3O_(12)和MoO_3的较佳摩尔比率为1:1,催化剂的较佳负载量为15%(wt),低反应温度和高原料流率可以提高对2-吡啶甲醛的选择性。较佳反应条件下(反应温度290℃,10%(wt)2-甲基吡啶水溶液的流率为0.5 m L×min-1,氧气的流率为0.1 L×min^(-1),空速12600 h^(-1)),2-甲基吡啶的转化率为70.9%,2-吡啶甲醛的选择性为83.1%。

Dual-metal catalysts Bi-Mo/TiO2 were prepared for gas-phase oxidation of 2-picoline to synthesize2-pyridylaldehyde, which was characterized by XRD, H2-TPR, SEM and XPS. The effects of experimentalparameters, such as catalyst composition, reaction temperature and material flow rate were investigated in detailThe results show that the high catalytic activity of Bi-Mo/TiO2 is based on the cooperative catalysis ofBi2Mo3Oi2 and MOO3. The optimized Bi2Mo3012/MoO3 molar ratio and loading amount of the catalyst are 1：1and 15%（wt） respectively. Meanwhile, low reaction temperature and high material flow rate can remarkablyincrease the selectivity. Under the optimal conditions （reaction temperature 290℃, flow rate 0.5 mL.min-l of10%（wt） 2-picoline solution, oxygen flow rate 0.1 L.min-l, space velocity 12600 h-l）, 2-picoline conversion of70.9% can be achieved with high 2-pyridylaldehyde selectivity of 83.1% using the prepared Bi-Mo/TiO2catalyst.