Carboxylic acids to butyl esters over dealuminated–realuminated beta zeolites for removing organic acids from bio-oils

Jianhua Li; Haiyan Liu; Tingting An; Yuanyuan Yue; Xiaojun Bao

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Carboxylic acids to butyl esters over dealuminated–realuminated beta zeolites for removing organic acids from bio-oils

机译：脱铝复聚的β沸石上的羧酸成丁酸酯，用于从生物油中去除有机酸

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This article describes a novel method to dealuminate and realuminate H-beta zeolites as catalysts for removing organic acids from bio-oils via their esterification reactions with alcohols. Modified H-beta zeolites were prepared by leaching with solutions of oxalic acid, DL-malic acid, and DL-tartaric acid that have different numbers of hydroxyl groups. The results showed that, while all three organic acids can dealuminate the parent H-beta zeolite, with Al(VI)_a atoms and Al(IV)_c ones being preferentially removed, they show quite different realumination abilities, with tartaric acid with two hydroxyl groups having the highest realumination ability. The concomitance of dealumination and realumination and their dependence on the hydroxyl group numbers of the organic acids provide the possibility of finely tuning the Al and acidity distributions of the resulting zeolites. Among the three acid treated H-beta zeolites, the one obtained from malic acid leaching exhibited the best performance in catalyzing the esterification reaction between acetic acid and sec-butyl alcohol, attributed to its suitable quantity and density of medium and strong Br?nsted acid sites and enhanced aluminum gradient. The catalytic results obtained in a fixed-bed microreactor revealed that the malic acid leached H-beta exhibited dramatically enhanced catalytic performance compared to the commercial ion-exchange resin Amberlyst? 15, demonstrating great potential for industrial application.

机译：本文介绍了一种新型的脱铝和复配H-β沸石催化剂的方法，该催化剂可通过生物油与醇的酯化反应从生物油中去除有机酸。通过用具有不同羟基数的草酸， DL -苹果酸和 DL -酒石酸溶液浸提制备改性的H-β沸石。结果表明，尽管所有三种有机酸都可以使母体H-β沸石脱铝，但Al（ VI ） _{a 原子和Al（优先除去 IV ） _{c ，它们显示出完全不同的还原能力，其中带有两个羟基的酒石酸具有最高的还原能力。脱铝和复粉的同质性以及它们对有机酸的羟基数的依赖性提供了微调所得沸石的Al和酸度分布的可能性。在三种酸处理过的H-β沸石中，苹果酸浸出的一种沸石在催化乙酸与仲丁醇之间的酯化反应方面表现出最好的性能，这归因于其合适的数量和密度。中，强布朗斯台德酸位和增强的铝梯度。在固定床微反应器中获得的催化结果表明，与商业化的离子交换树脂Amberlyst？相比，苹果酸浸出的H-β表现出显着增强的催化性能。 15，具有巨大的工业应用潜力。}} 展开▼

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《RSC Advances》 |2017年第54期|共12页

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Jianhua Li; Haiyan Liu; Tingting An; Yuanyuan Yue; Xiaojun Bao;
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1. Carboxylic acids to butyl esters over dealuminated–realuminated beta zeolites for removing organic acids from bio-oils [J] . Jianhua Li, Haiyan Liu, Tingting An, RSC Advances . 2017,第54期

机译：脱铝复聚的β沸石上的羧酸成丁酸酯，用于从生物油中去除有机酸

2. Highly Enantioselective Synthesis of (S)-alpha-Alkyl-alpha,beta-diaminopropionic Acids via Asymmetric Phase-Transfer Catalytic Alkylation of 2-Phenyl-2-imidazoline-4-carboxylic Acid tert-Butyl Esters [J] . Park Y, Kang S, Lee YJ, Organic letters . 2009,第16期

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机译：3-叔丁基或3-叔丁基-5-烷基-4-羟基苯基（烷烃）羧酸与单官能醇和酚的乙氧基化物的酯，其制备方法及其作为有机聚合物稳定剂的用途

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Carboxylic acids to butyl esters over dealuminated–realuminated beta zeolites for removing organic acids from bio-oils

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