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首页> 外文期刊>Catalysis science & technology >Dihydroxyacetone conversion into lactic acid in an aqueous medium in the presence of metal salts: influence of the ionic thermodynamic equilibrium on the reaction performance
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Dihydroxyacetone conversion into lactic acid in an aqueous medium in the presence of metal salts: influence of the ionic thermodynamic equilibrium on the reaction performance

机译：二羟基丙酮转化成乳酸水介质在金属盐的存在:影响离子的热力学平衡对反应性能

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摘要

The catalytic conversion of dihydroxyacetone (DHA) to lactic acid (LA) via pyruvaldehyde (PA) in an aqueous medium was studied using different homogeneous metal salts. A kinetic model was developed and the parameters corresponding to each reaction step were estimated. Agreement between experiments and simulated results was excellent and the performance of the different catalysts was consistent with previous studies described in the literature. Aluminium salts, which show the best performance, were tested in a whole range of concentrations and at different pH values in order to identify the catalytically active ionic species. It was confirmed that the DHA to pyruvaldehyde (PA) dehydration step is catalyzed by both Bronsted and Lewis acids, whereas the consecutive reaction of PA to LA is catalyzed solely by Lewis acids. Moreover, a comparison of the thermodynamic analysis of the reaction medium and the kinetic parameters demonstrated that cationic hydroxyl-aluminium complexes [Al.OH)(h)]((3-h)+) formed in situ by the hydrolysis of aluminium aqua complexes like [Al(OH2)(6)](3+) are the most active Lewis acids.
机译：二羟丙酮(DHA)的催化转化乳酸(LA)通过pyruvaldehyde (PA)的水介质,研究了使用不同均匀的金属盐。发达国家和对应的参数估计每一个反应步骤。实验和模拟结果之间的关系优秀的性能不同催化剂与先前的研究是相一致的在文献中描述。展示最好的性能,测试吗整个浓度范围和在不同的pH值为了识别催化地值活性离子物种。DHA pyruvaldehyde (PA)脱水步骤布仑斯惕和路易斯酸催化反应,而爸爸的连续反应啦仅仅以路易斯酸催化。比较的热力学分析反应介质和动力学参数表明,阳离子hydroxyl-aluminium复合物[Al.OH) (h)) ((3 - h) +)原位形成的铝的水解aqua复合物(Al(这里)(6))(3 +)是最活跃的路易斯酸。

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