The liquid-phase oxidation of ethanol to acetic acid using Au catalysts supported on various metal oxides was studied at 150°C using molecular oxygen as stoichiometric oxidant. Catalysts containing 1 wt% Au supported on TiO2, Al2O3, and ZnO were examined for ethanol oxidation. The results showed that ZnO and TiO2 gave higher initial activities as supports for gold in ethanol oxidation, followed by Al2O3. Ethanol conversions of >90% and selectivities to acetic acid of >95% were achieved when using ZnO and TiO2 as supports under conditions where a slight oxygen deficiency was used. With a slight excess of oxygen present initially, ethanol conversions of 99.4%, and a selectivity to acetic acid selectivity of 99.8% could be achieved. Gold leaching seemed to be very apparent with alumina as support and also, after continued use with titania-based catalysts. The use of higher initial concentrations of ethanol (range studied 5–40 mass% ethanol in water) led to higher ethyl acetate selectivities. High acetic acid selectivities were seen for relatively low (5–10 mass%) initial ethanol concentrations.

中文翻译：

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使用负载在各种金属氧化物上的 Au 催化剂通过乙醇选择性氧化生产乙酸

使用分子氧作为化学计量氧化剂，在 150°C 下研究了使用负载在各种金属氧化物上的 Au 催化剂将乙醇液相氧化成乙酸。检测了负载在 TiO2、Al2O3 和 ZnO 上的含有 1wt% Au 的催化剂的乙醇氧化。结果表明，在乙醇氧化中，ZnO 和 TiO2 作为金的载体具有更高的初始活性，其次是 Al2O3。当在使用轻微缺氧的条件下使用 ZnO 和 TiO2 作为载体时，乙醇转化率 >90%，乙酸选择性 >95%。最初存在略微过量的氧气时，乙醇转化率为 99.4%，乙酸选择性为 99.8%。以氧化铝为载体，金浸出似乎非常明显，而且，继续使用二氧化钛基催化剂后。使用更高的初始乙醇浓度（研究范围为水中 5-40 质量% 的乙醇）导致更高的乙酸乙酯选择性。对于相对较低（5-10 质量％）的初始乙醇浓度，可以看到高乙酸选择性。