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两步法制备Keggin-PW@UIO-66复合材料用于大豆油高效长寿命转化为生物柴油

Two-step preparation of Keggin-PW@UIO-66 composite showing high-activity and long-life conversion of soybean oil into biodiesel.

作者信息

Zhang Yuxin, Song Xinluo, Li Shicong, Zhao Bangyao, Tong Liangliang, Wang Yuanrui, Li Yafeng

机构信息

School of Chemical Engineering, Changchun University of Technology 130012 Changchun P. R. China

出版信息

RSC Adv. 2021 Nov 25;11(60):38016-38025. doi: 10.1039/d1ra06211e. eCollection 2021 Nov 23.

DOI:10.1039/d1ra06211e
PMID:35498087
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9044021/
Abstract

A polyoxometalate acid can be encapsulated into a metal-organic framework to construct a novel kind of solid-acid catalyst. In this work, the two-step method -high-temperature preparation of ZrO(OH)(CHCOO) and low-temperature self-assembly-has been adopted to synthesize the PW@UIO-66 composite (PW = HPWO; UIO-66 = ZrO(OH)(OOC-CH-COO)). The as-synthesized PW@UIO-66 composite exhibits highly crystalline, good octahedron morphology, large specific surface area (1960 m g) and high thermal stability (>500 °C), which clearly demonstrates the potential as a solid-acid catalyst. Additionally, the PW@UIO-66 composite may be accomplished with 85% utilization of HPWO and 95% yield through this synthetic procedure. The performances of the PW@UIO-66 composite are investigated by catalyzing the simultaneous transesterification and esterification of soybean oil into biodiesel. Under the optimal conditions, the conversion of the soybean oil into biodiesel would exceed 90% over the as-synthesized PW@UIO-66 composite. As the crucial indexes for industrial prospects, the recycling and life experiments were surveyed. After 10 times recycling and 4 weeks, the structure and performance of the PW@UIO-66 composite remained unchanged and in the meantime the PW@UIO-66 composite still maintained a high activity to convert soybean oil into biodiesel.

摘要

多金属氧酸盐酸可以被封装到金属有机框架中以构建一种新型的固体酸催化剂。在这项工作中，采用两步法——高温制备ZrO(OH)(CHCOO)和低温自组装——来合成PW@UIO-66复合材料（PW = HPWO；UIO-66 = ZrO(OH)(OOC-CH-COO)）。所合成的PW@UIO-66复合材料呈现出高度结晶性、良好的八面体形态、大的比表面积（1960 m g）和高的热稳定性（>500 °C），这清楚地表明了其作为固体酸催化剂的潜力。此外，通过该合成程序，PW@UIO-66复合材料可以实现85%的HPWO利用率和95%的产率。通过催化大豆油同时进行酯交换和酯化反应生成生物柴油来研究PW@UIO-66复合材料的性能。在最佳条件下，在所合成的PW@UIO-66复合材料上，大豆油转化为生物柴油的转化率将超过90%。作为工业前景的关键指标，对回收和寿命实验进行了考察。经过10次回收和4周后，PW@UIO-66复合材料的结构和性能保持不变，同时PW@UIO-66复合材料仍保持将大豆油转化为生物柴油的高活性。

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