新型多金属氧酸盐-离子液体混合物催化的木质纤维素的面向产物的分解。

Product-oriented decomposition of lignocellulose catalyzed by novel polyoxometalates-ionic liquid mixture.

机构信息

State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, China.

出版信息

Bioresour Technol. 2019 Jul;283:174-183. doi: 10.1016/j.biortech.2019.03.048. Epub 2019 Mar 9.

DOI:10.1016/j.biortech.2019.03.048

PMID:30904697

Abstract

Lignocellulose was oxidatively decomposed in a newly developed polyoxometalates-imidazolium ionic liquid mixture. Aromatic compounds covering acids, esters, ketones, aldehydes, and phenols were selectively produced under various conditions. 4-Hydroxylbenzoic acid was dominatingly yielded under low temperature and high oxidant concentration. Phenolic compounds were mainly generated at high temperature with a selectivity of 45.1% and a yield of 4.3%, higher than those generated in similar polyoxometalates-ionic liquids system. The products distributions and residues of lignocellulose decomposition under various conditions were characterized; the influences of the ionic liquids anions on the polyoxometalates-ionic liquids complex formation, the acidic and redox properties of the catalyst, and the final products were profoundly investigated; and a tentative reacting process was proposed. The ionic liquid could be recycled for five times. This work not only provided a new lignocellulose decomposition strategy to produce aromatic products, but also offered a guidance for product-oriented lignocellulose decomposition.

摘要

木质纤维素在新型多金属氧酸盐-咪唑离子液体混合物中被氧化分解。在不同条件下，选择性地生成了涵盖酸、酯、酮、醛和酚的芳香族化合物。在低温和高氧化剂浓度下，主要生成 4-羟基苯甲酸。在高温下，主要生成酚类化合物，选择性为 45.1%，产率为 4.3%，高于在类似多金属氧酸盐-离子液体体系中生成的酚类化合物。对不同条件下木质纤维素分解的产物分布和残留物进行了表征；深入研究了离子液体阴离子对多金属氧酸盐-离子液体配合物形成、催化剂的酸性和氧化还原性能以及最终产物的影响；并提出了一个推测的反应过程。离子液体可回收使用五次。这项工作不仅为生产芳香族产品提供了一种新的木质纤维素分解策略，也为定向木质纤维素分解提供了指导。