Green synthesis of sulfonated organosilane functionalized multiwalled carbon nanotubes and its catalytic activity for one-pot conversion of high free fatty acid seed oil to biodiesel

JOURNAL OF CLEANER PRODUCTION

卷:275

Article

Macawile, Maria Cristina^1,3,4  Quitain, Armando T.^1,2  Kida, Tetsuya¹  Tan, Raymond³  Auresenia, Joseph³ 

[1] Kumamoto Univ, Fac Adv Sci & Technol, Kumamoto, Japan

[2] Kumamoto Univ, Ctr Int Educ, Chuo Ku, 2-40-1 Kurokami, Kumamoto 8608555, Japan

[3] De La Salle Univ, Gokongwei Coll Engn, Chem Engn Dept, 2401 Taft Ave, Manila, Philippines

[4] De La Salle Univ Dasmarinas, Coll Engn Architecture & Technol, DBB B 4115,West Ave, Dasmarinas, Cavite, Philippines

关键词: Biodiesel;    Hibiscus cannabinus;    Organosilane;    Carbon nanotube;    Supercritical carbon dioxide;   

DOI  :  10.1016/j.jclepro.2020.123146

来源: Elsevier

【 摘 要 】

An environmentally friendly surface modification method was applied to synthesize solid acid catalyst suitable for biodiesel production. The catalyst was prepared from multiwalled carbon nanotube (MWCNT) and 3-mercaptopropyltrimethoxysilane (3-MPTMS) oxidized in hydrogen peroxide under supercritical carbon dioxide (scCO(2)). The carbon dioxide under supercritical condition with ethanol as cosolvent allows swift transportation and promotes uniform distribution of organosilane groups on randomly entangled and layered orientation of MWCNT. The catalyst was characterized by using Field emission scanning electron microscopy-energy dispersive x-ray (FESEM-EDX), Thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis and Time-of-Flight secondary ion mass spectrometry (TOF-SIMS). The catalytic activity of the catalyst was tested using a high free fatty acid (FFA)-containing Hibiscus cannabinus (kenaf) oil, and the fatty acid methyl esters (FAME) products from simultaneous esterification and transesterification reactions were quantified. To compare with scCO(2) method, an acid catalyst was also prepared using liquid chemical deposition that resulted in only 45.11% biodiesel conversion. On the other hand, the optimum conversion of 93.10% was obtained using a scCO(2) synthesized catalyst at the following transesterification conditions: temperature = 63 degrees C, methanol:oil ratio = 14:1, 10 wt % catalyst and time = 240 min. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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