【摘要】 因H₂SO₄在乙酸氧化法制备过氧乙酸（PAA）中存在不易分离、难回收、后处理困难等缺点,本文以γ-Al₂O₃、四水合钼酸铵为原料,浸渍-煅烧法制备了一系列γ-Al₂O₃负载MoO₃复合材料（γ-Al₂O₃/MoO₃）固体酸,替代H₂SO₄用于PAA的制备.NH₃-TPD显示,γ-Al₂O₃/MoO-65₃拥有弱酸位点、中位酸位点、强酸位点,弱酸和中位酸位点的强度明显大于MoO₃.由于复合材料中γ-Al₂O₃的Lewis酸较强,Al/Mo-65的Lewis酸强度较大,并且其Br??nsted酸、Lewis酸的强度随温度升高而下降.γ-Al₂O₃/MoO₃均可在温和条件下制备PAA,其中Al/Mo-65用量为0.6 g、m（乙酸）∶m（过氧化氢）=1∶1（总质量60 g）、30℃反应24 h,PAA的质量浓度为6.76%;催化剂重复使用5次,PAA质量浓度降至3.51%.对比Al/Mo-65使用前后的XRD,催化剂成分不变,但MoO₃衍射峰强度降低.自制的PAA对大肠杆菌、金黄色葡萄球菌的抗菌效果良好.更多还原

【Abstract】 As H₂SO₄ have disadvantages in the acetic acid oxidation method for preparing peracetic acid（PAA）,such as difficulty in separation,poor recoverability and challenging post-treatment.A series of γ-Al₂O₃ supported MoO₃ composites（γ-Al₂O₃/MoO₃） were_prepared by the impregnationcalcination method using γ-Al₂O₃ and ammonium molybdate tetrahydrate as raw materials,in which γ-Al₂O₃/MoO₃ was used as a solid acid catalyst instead of H₂SO₄ for synthesizing PAA.NH₃-TPD results show that γ-Al₂O₃/MoO-65₃ possesses weak acid sites,medium acid sites and strong acid sites.Moreover,the strength of the weak acid sites or medium acid sites is significantly greater than MoO₃.γ-Al₂O₃ has a strong Lewis acid property in the composite material,so Lewis acid strength of Al/Mo-65 is higher.With the temperature rises,the strength of Br??nsted acid and Lewis acid of Al/Mo-65 decreases in pyridine-infrared spectrum.γ-Al₂O₃/Mo O₃ can be used to prepare PAA under mild conditions.Among them,the mass of Al/Mo-65 is 0.6 g,the concentration of PAA reaches 6.76% at 30 ℃ for 24 h when the mass ratio of CH₃ COOH to H₂O₂ is 1∶1（60 g in total）.The catalyst is recycled 5 times,and the concentration of PAA is 3.65%.Comparison of XRD before and after Al/Mo-65 usage,the composition of the catalyst remains unchanged.But the characteristic diffraction peak intensity of MoO₃ in the used Al/Mo-65 is weakened.The active component of the Al/Mo-65 is lost.Self-made PAA has good antibacterial effect against Escherichia coli and Staphylococcus aureus.更多还原