V-Cu氧化物催化碳酸二甲酯与苯酚酯交换反应

研究了一系列钒-金属复合氧化物对碳酸二甲酯(DMC)和苯酚酯交换合成碳酸二苯酯(DPC)的催化性能，实验结果表明，钒-铜复合氧化物是较好的酯交换合成DPC的催化剂。考察了V/Cu摩尔比，催化剂用量，DMC用量和反应时间对酯交换反应的影响，得到较佳的反应条件： n(V):n(Cu) = 4:1，苯酚用量0.16 mol，V-Cu复合氧化物催化剂的用量为苯酚用量的3.1%（质量比）， n(DMC) : n(苯酚) = 1.5 :1，反应时间9～15 h。在此条件下反应9 h，苯酚的转化率为41.9%，甲基苯基碳酸酯(MPC)及DPC的总收率为40.3%。催化剂重复使用4次后苯酚转化率从41.9%降到29.1%，多次重复使用后的催化剂在空气氛中焙烧即可再生，再生催化剂的催化性能几乎和新鲜催化剂相当，苯酚转化率达到39.8%。

V-Cu oxide for transesterification of dimethyl carbonate with phenol

A series of catalysts were studied for the synthesis of diphenyl carbonate (DPC) by transesterification of dimethyl carbonate (DMC) with phenol.It was found that V-Cu oxide was the best catalyst among the tested catalysts.The effects of V-Cu amount, molar ratio of copper to vanadium, molar ratio of dimethyl carbonate to phenol and reaction time were investigated.Under the conditions of catalyst amount 3.1% (mass ratio to phenol), molar ratio of Cu/V of 1∶4, molar ratio of DMC/phenol of 1.5∶1 and a reaction time 9 h, the maximum conversion of phenol and total yields of methyl phenyl carbonate (MPC) and DPC were 41.9% and 40.3%, respectively.Reuse of the catalyst revealed that V-Cu oxide was a relatively stable catalyst.The activity of the catalyst after being reused four times reduced from 41.9% to 29.1%.Moreover, the deactivated catalyst was easily regenerated by calcination in air, and the catalytic activity of the regenerated catalyst was almost as high as that of the fresh sample, the phenol conversion was 39.8%.