Dawson型磷钼钒杂多酸催化环己醇氧化制备环己酮

合成了 Dawson 型磷钼钒杂多酸,采用傅里叶变换红外光谱和 X 射线衍射等方法表征了磷钼钒杂多酸的结构;以环己醇为原料、H_2O_2为氧化剂、磷钼钒杂多酸为催化剂制备了环己酮,考察了催化剂的钒含量、溶剂的类型和反应条件(催化剂用量、H_2O_2用量、反应时间和反应温度)对环己醇氧化反应的影响。实验结果表明,钒含量适中的 H_8P_2Mo_(16)V_2O_(62)催化剂活性最高,乙腈是该反应的优质溶剂。环己醇催化氧化制备环己酮的适宜反应条件为:环己醇0.05 mol、H_8P_2Mo_(16)V_2O_(62)催化剂用量0.25 mmol、质量分数30%的 H_2O_2溶液用量20 mL、反应时间2 h、反应温度80℃、乙腈用量10 mL;在此条件下,环己醇转化率为59.3%,环己酮选择性为73.5%。

Preparation of Cyclohexanone Through Catalytic Oxidation of Cyclohexanol over Dawson Type P-Mo-V Heteropolyacid

Cyclohexanol was oxidized into cyclohexanone over Dawson type P-Mo-V heteropolyacid catalyst with H_2O_2 as oxidant.The prepared heteropolyacid was characterized by means of FTIR and XRD.Effects of solvent type,vanadium content in P-Mo-V heteropolyacid,catalyst dosage and H_2O_2 dosage,reaction temperature and reaction time on oxidation of cyclohexanol were investigated.The H_8P_2Mo_(16)V_2O_(62) with moderate content of vanadium is the highest in activity and acetonitrile is an ideal solvent.Under optimal ...