Preparation of Biodiesel Using Silver-Modified Phosphotungstic Acid as Catalyst

doi:10.11938/cjmr20192760

Abstract

Abstract: A series of silver-modified phosphotungstic acid catalysts Ag_xH_3-xPW₁₂O₄₀ (x=1, 2, 3) were synthesized by incorporating silver nitrate into phosphotungstic acid. The structure, stability and acidity of the catalysts synthesized were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis-derivative thermogravimetric analysis (TGA-DTG) and ³¹P-TMPO magic-angle spinning nuclear magnetic resonance (³¹P-TMPO MAS-NMR) spectroscopy. The effects of various reaction parameters, such as methanol/oil molar ratio, amount of catalyst, reaction time, and reaction temperature on the catalytic transesterification of soybean oil and methanol with Ag₂HPW₁₂O₄₀ were investigated. The results demonstrated that Ag₂HPW₁₂O₄₀ had the best catalytic activity, superior biodiesel yield and excellent durability. The high catalytic activity of the catalyst was attributed to Brønsted-Lewis acid synergy. With 6 wt.% Ag₂HPW₁₂O₄₀ catalyst, the yield of biodiesel reached 96.4% with a methanol/soybean oil molar ratio of 32/1, a reaction temperature of 150℃ and a reaction time of 20 h.

Key words: phosphotungstic acid, transesterification reaction, biodiesel, catalyst

CLC Number:

TQ517.2

XU Chao, CAI Zhe, WANG Qing, MEI Xing-yu, ZHOU You-sheng, XU Yi-ming, DUAN-MU Jia-hui, WANG Si-tian, HAN Xiao-xiang. Preparation of Biodiesel Using Silver-Modified Phosphotungstic Acid as Catalyst[J]. Chinese Journal of Magnetic Resonance, 2020, 37(1): 86-94.

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