不同催化剂在过氧化氢氧化苯酚反应中的催化效果

Effect of Various Catalysts on the Hydroxylation of Phenol by Hydrogen Peroxide

主要对过氧化氢氧化苯酚反应中Fe2 + 的催化特性进行了实验研究 ,结果得出 :当Fe2 + 浓度为 0～0 0 5mmol·L-1时 ,催化活性增长显著 ,当浓度为 0 0 5～ 0 2 5mmol·L-1时 ,催化活性呈缓慢增长趋势 ,等量铁离子 (Fe3 + +Fe2 + )中不同含量的Fe3 + 对反应无明显影响。通过对相同实验条件下不同催化剂 (Fe2 + ,Cu2 + ,Fe2 + -Co2 + ,Fe2 + -Ce4+ ,Co -Fe -oxide)催化效果的研究发现 ,Fe2 + 作催化剂时苯酚与过氧化氢的转化率最高 ,Cu2 + 和Ce4+ 有利于邻

The catalytic activity of iron ion in the catalytic hydroxylation of phenol to dihydroxybenzene was studied. It can be obtained that the change of catalytic activity is notable for the varing concentration in the range 0 05 mmol·L -1 to 0 25 mmol·L -1, the catalytic activity increases slowly from 0 05 mmol·L -1 to 0 25 mmol·L -1, the different contents of Fe 3+ in the same contents of iron ion have no influence on the reaction. The catalytic activity of various catalysts(Fe 2+,Cu 2+,Fe 2+-Co 2+,Fe 2+-Ce 4+,Co-Fe-oxide) was also studied under the same experimental conditions. It can be found that for the effective conversion rate of phenol and hydrogen peroxide,single Fe 2+ is higher than others, while Cu 2+ and Ce 4+ are benefit to raising the ratio of pyrocatechol to hydroquinone.