(NH_4)_(15)[La(PMo_9V_2O_(39))_2]·6H_2O杂多配合物对苯酚羟化的催化作用

Catalytic Activity of (NH_4)_(15) [La(PMo_9V_2O_(39) )_2]·6H_2O Heteropoly Complex in Phenol Hydroxylation with Hydrogen Peroxide

合成了 ( NH4 ) 15[L a( PMo9V2 O39) 2 ]· 6H2 O杂多配合物 ,并考察其对苯酚过氧化氢羟化反应的催化活性 .探讨了温度、催化剂用量、反应时间、n( Ph OH) /n( H2 O2 )摩尔比以及反应介质的 p H值对反应的影响 .实验结果表明 ,以甲醇为溶剂、n( Ph OH) /n( H2 O2 ) =1∶ 2、反应体系的 p H值为 5左右、反应温度 343K、反应时间约 4h的条件下 ,苯酚转化率可达 44.30 % ,对苯二酚产率达 43.35% .并采用 ICP、IR、UV和 XRD等技术 ,对( NH4 ) 15[L a( PMo9V2 O39) 2 ]· 6H2 O进行表征 ,初步证实了 ( NH4 ) 15[L a( PMo9V2 O39) 2 ]· 6H2 O具有 Keggin结构 .

NH 4) 15 [La(PMo 9V 2O 39 ) 2]·6H 2O heteropoly complex was synthesized and used to catalize phenol hydroxylation with hydrogen peroxide. The effects of temperature, catalyst amount, reaction time and H 2O 2/phenol(molar ratio) were studied. Experimental results indicate that conversion of phenol reaches 44.30% and yield of hydroquinone achieves 43.25%, with methanol as the solvent, n (PhOH)/ n (H 2O 2) =1∶2, pH=5, reaction temperature 343 K, reaction time 4 h. Meanwhile, the title compound was characterized by ICP, XRD, IR, UV, and the results showed that the (NH 4) 15 [La(PMo 9V 2O 39 ) 2]· 6H 2O is of Keggin structure type.