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低成本硅藻土负载二元过渡金属硫酸盐：一种用于生物柴油合成的高效可重复使用固体催化剂。

Low-cost diatomite supported binary transition metal sulfates: an efficient reusable solid catalyst for biodiesel synthesis.

作者信息

Chen Weiqing, Wu Zhaoji, Peng Ruoxue, Wu Wenjuan, Li Xiaonan, Cao Dan, Zhang Zhigang, Niu Kui

机构信息

College of Chemical Engineering, Hebei Normal University of Science & Technology Qinhuangdao China 066600

Hebei Key Laboratory of Active Components and Functions in Natural Products Qinhuangdao China 066600

出版信息

RSC Adv. 2023 Feb 17;13(9):6002-6009. doi: 10.1039/d2ra07947j. eCollection 2023 Feb 14.

DOI:10.1039/d2ra07947j
PMID:36816082
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9936845/
Abstract

Using a simple method of impregnation and then calcination, diatomite supported binary transition metal sulfates (Fe and Zr, designated as Fe(SO)&Zr(SO)@diatomite) were prepared and used as a catalyst in the preparation of renewable biofuels. The synthesised Fe(SO)&Zr(SO)@diatomite catalyst (Fe(SO) : Zr(SO) : diatomite = 1 : 2 : 6, mass ratio) was thoroughly characterised using transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, microbeam X-ray fluorescence (μ-XRF) spectroscopy and thermogravimetric analysis (TG). The results demonstrated that the sulfate was successfully loaded onto the diatomite with a uniform distribution. The N adsorption/desorption analysis indicated that the catalyst's specific surface area was 1.54 m g. The catalyst exhibited outstanding performance in the preparation of renewable biofuel (biodiesel) from waste fatty acids and the optimal parameters were methanol-to-oil 1.25 : 1, reaction temperature 70 °C, catalyst concentration 10 wt%, reaction time 4 h. The conversion was found to reach 98.90% under optimal parameters, which is better than that of Fe(SO)·HO, Zr(SO)·4HO, Fe(SO)@diatomite and Zr(SO)@diatomite. Moreover, the catalyst can be recycled by simple filtration and reused for three cycles after regeneration without noticeable reduction in catalytic activity.

摘要

采用简单的浸渍然后煅烧的方法，制备了硅藻土负载的二元过渡金属硫酸盐（铁和锆，命名为Fe(SO)₄&Zr(SO)₄@硅藻土），并将其用作制备可再生生物燃料的催化剂。使用透射电子显微镜（TEM）、X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、微束X射线荧光（μ-XRF）光谱和热重分析（TG）对合成的Fe(SO)₄&Zr(SO)₄@硅藻土催化剂（Fe(SO)₄ : Zr(SO)₄ : 硅藻土 = 1 : 2 : 6，质量比）进行了全面表征。结果表明，硫酸盐成功负载在硅藻土上且分布均匀。N吸附/脱附分析表明该催化剂的比表面积为1.54 m²/g。该催化剂在由废脂肪酸制备可再生生物燃料（生物柴油）方面表现出优异性能，最佳参数为甲醇与油的比例为1.25 : 1、反应温度70°C、催化剂浓度10 wt%、反应时间4小时。发现在最佳参数下转化率达到98.90%，优于Fe(SO)₄·H₂O、Zr(SO)₄·4H₂O、Fe(SO)₄@硅藻土和Zr(SO)₄@硅藻土。此外，该催化剂可通过简单过滤回收，并在再生后重复使用三个循环，催化活性无明显降低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/734ced25b770/d2ra07947j-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/00217112d86f/d2ra07947j-s1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/11f34911f9ce/d2ra07947j-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/10686731348f/d2ra07947j-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/d165b703d2bc/d2ra07947j-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/884fef6683ff/d2ra07947j-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/734ced25b770/d2ra07947j-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/00217112d86f/d2ra07947j-s1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/85a83819aa4b/d2ra07947j-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/1fe9457ba90a/d2ra07947j-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/b88c7a26b2c0/d2ra07947j-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/11f34911f9ce/d2ra07947j-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/10686731348f/d2ra07947j-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/d165b703d2bc/d2ra07947j-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/884fef6683ff/d2ra07947j-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4feb/9936845/734ced25b770/d2ra07947j-f8.jpg

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