Abstract

It was investigated the lactic acid production by glycerol oxidation using % 1 Au/bentonite catalysts in alkaline medium. The reactions were performed in a 100 mL volume three-necked and round-bottomed flask placed in an oil bath over a period of 4 h at 90 °C reaction temperature and atmospheric pressure. 1 wt% Au based bentonite catalysts were prepared by incipient to wetness method. Gold metal is chosen for catalyst active material since it is active under mild conditions and activation conditions of support material were investigated. Bentonite supports, activated under different conditions (temperature and acidic medium) were used as supports. Results of bentonite supported studies showed that the use of heterogeneous catalysts was necessary and bentonite activation improved catalytic activity, but the application of chemical activation negatively affected lactic acid selectivity. The highest glycerol conversion (76%) has been obtained with 1 wt% Au catalyst that the support was activated by thermally and chemically at 700 °C and 1 M HCl. And also the maximum lactic acid amount (18%) was obtained with this catalyst. The chemical activation of the support material at high acid concentration has caused a high conversion and lactic acid selectivity.

中文翻译：

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膨润土载体在金基催化剂上由甘油生产乳酸的活化条件

摘要

研究了在碱性介质中使用％1 Au /膨润土催化剂通过甘油氧化生产乳酸的方法。反应在90°C反应温度和大气压下，于4小时内在置于油浴中的100 mL体积的三颈圆底烧瓶中进行。通过初湿法制备了1wt％的Au基膨润土催化剂。选择金金属作为催化剂活性材料是因为它在温和的条件下具有活性，并研究了载体材料的活化条件。将在不同条件（温度和酸性介质）下活化的膨润土载体用作载体。膨润土支持的研究结果表明，使用非均相催化剂是必要的，膨润土活化可提高催化活性，但是化学活化的应用不利地影响了乳酸的选择性。用1 wt％的Au催化剂获得了最高的甘油转化率（76％），该载体在700°C和1 M HCl下通过热化学方法活化。而且，用该催化剂也可得到最大乳酸量（18％）。载体材料在高酸浓度下的化学活化导致高转化率和乳酸选择性。