Nattha Baingam, Li-Yu Wang, Dr. Shih-Yuan Chen, Fitrah Hardhana, Dr. Chung-Kai Chang, Dr. Hiroyuki Tateno, Dr. Takehisa Mochizuki, Prof. Chia-Min Yang, Prof. Apanee Luengnaruemitchai
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引用次数: 0
摘要
将生物柴油(BDF)与汽油柴油混合,可以有效减少交通领域的二氧化碳排放量。通过将粗甘油(BDF工业的副产品)转化为高价值产品,如可作为生物燃料添加剂的三乙酸酯,可以进一步减少碳足迹。本研究以丙基磺酸功能化KIT-6介孔二氧化硅(PA-KIT-6)为固体催化剂,研究了甘油与乙酸的乙酰化反应。以3-巯基丙基三甲氧基硅烷(MPTMS)和过氧化氢为前驱体和氧化剂,采用不同磺酸负载的后合成(接枝)法和直接合成(共缩合)法制备了一系列PA-KIT-6催化剂。原位漫反射红外傅里叶变换光谱和x射线光电子能谱证实,所有催化剂均含有Brønsted酸位,且随着磺酸的负载增加,Brønsted酸位增加。负载0.25 mmol g - 1磺酸的P-20PA-KIT-6催化剂性能最好。在115°C条件下,甘油与乙酸的摩尔比为1:9,催化剂质量分数为2.83 wt.%,反应8小时,甘油快速消耗,三乙酸酯的选择性达到52%。该催化剂可重复使用,在四个循环中保持其活性和选择性。本研究强调了具有Brønsted酸性的磺酸基固体酸在甘油乙酰化过程中的内在活性,有效地产生三乙酸素。
Sulfonic Acid-Functionalized KIT-6 Solid Acid Catalysts for Glycerol Acetylation
Blending biodiesel fuel (BDF) with petrodiesel effectively reduces CO₂ emissions in the transportation sector. The carbon footprint can be further minimized by converting crude glycerol, a byproduct of the BDF industry, into high-value products like triacetin, which can serve as a biofuel additive. This study demonstrated the acetylation of glycerol with acetic acid using propylsulfonic acid-functionalized KIT-6 mesoporous silica (PA-KIT-6) as a solid catalyst to produce triacetin. A series of PA-KIT-6 catalysts was synthesized by post-synthesis (grafting) and direct-synthesis (co-condensation) methods with varying sulfonic acid loading, using 3-mercaptopropyltrimethoxysilane (MPTMS) and hydrogen peroxide as precursor and oxidant. In-situ diffuse reflectance infrared Fourier transform spectroscopy and X-ray photoelectron spectra confirm that all catalysts contained Brønsted acid sites, which increased with sulfonic acid loading. The P-20PA-KIT-6 catalyst, with 0.25 mmol g⁻¹ sulfonic acid loading, exhibited the best performance. Glycerol was rapidly consumed, and 52% selectivity for triacetin was achieved using a 1:9 glycerol-to-acetic acid molar ratio and 2.83 wt.% catalyst at 115 °C for 8 h. This catalyst was reusable, maintaining its activity and selectivity over four cycles. This study highlights the intrinsic activity of sulfonic acid-based solid acids with Brønsted acidity in glycerol acetylation, effectively producing triacetin.
期刊介绍:
With an impact factor of 4.495 (2018), ChemCatChem is one of the premier journals in the field of catalysis. The journal provides primary research papers and critical secondary information on heterogeneous, homogeneous and bio- and nanocatalysis. The journal is well placed to strengthen cross-communication within between these communities. Its authors and readers come from academia, the chemical industry, and government laboratories across the world. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies, and is supported by the German Catalysis Society.