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首页> 外文期刊>RSC Advances >Synergetic effects of bimetals in modified beta zeolite for lactic acid synthesis from biomass-derived carbohydrates
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Synergetic effects of bimetals in modified beta zeolite for lactic acid synthesis from biomass-derived carbohydrates

机译：双金属在改性β沸石中的协同作用，用于从生物质衍生的碳水化合物合成乳酸

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An experimental study was carried out to convert carbohydrates using bimetal modified beta zeolite to obtain a maximum yield of lactic acid. The relationship between the properties and the catalytic performance of various bimetal modified beta zeolites was evaluated. The results showed that the maximum yield of lactic acid reached 52% with more than 99% glucose conversion over Pb–Sn-beta (0.3 mmol g ~(?1) , Pb/Sn = 4?:?7) at 190 °C for 2 h under ambient air pressure. To evaluate the synergetic mechanism of lead and tin, key intermediates such as fructose, dihydroxyacetone, glyceraldehyde and pyruvaldehyde were used as probe reactants that were catalyzed by Pb-beta, Sn-beta and Pb–Sn-beta. The revealed key role of lead was to promote the isomerization of glucose to fructose and the retro-aldol condensation reaction from fructose to dihydroxyacetone and glyceraldehyde; meanwhile, tin had a superior catalytic performance in the dehydration of dihydroxyacetone, the hydration of pyruvaldehyde and the isomerization of pyruvic aldehyde hydrate.
机译：进行了一项实验研究，以使用双金属改性的β沸石转化碳水化合物，以获得最大的乳酸产量。评价了各种双金属改性的β沸石的性质与催化性能之间的关系。结果表明，在190°C时，在Pb-Sn-β（0.3 mmol g〜（？1），Pb / Sn = 4？：？7）的条件下，葡萄糖的最大产率达到52％，葡萄糖转化率超过99％。在环境气压下放置2小时。为了评估铅和锡的协同作用机理，使用了果糖，二羟基丙酮，甘油醛和丙酮醛等关键中间体作为探针反应物，并通过Pb-beta，Sn-beta和Pb-Sn-beta进行催化。铅的关键作用是促进葡萄糖异构化为果糖，以及促进果糖向二羟基丙酮和甘油醛的逆醛醇缩合反应。同时，锡在二羟基丙酮的脱水，丙酮醛的水合和丙酮醛水合物的异构化方面具有优异的催化性能。

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