Authors: Bharatkumar Z. Dholakiya and Mehulkumar L. Savaliya
Disadvantages of homogeneous acid catalysts and advantages of heterogeneous acid catalysts are the main reasons behind why researchers are focusing on development of heterogeneous acid catalysts. Therefore, in the present investigation, silica based boron tri sulfonic acid (SBTSA) was successfully synthesized via chlorosulfonation of boric acid at ambient temperature and pressure. During this investigation we found that the reaction is easy and clean, and needs no special work up procedure. Also, work was investigated to synthesize biodiesel fuel via transesterification of soybean oil over silica boron tri sulfonic acid, as an efficient, recoverable and recyclable solid acid catalyst. Highest biodiesel yield observed was 94.53 %. Synthesized catalyst was fittingly characterized by Fourier transform infrared (FT-IR) spectroscopy, Temperature programmed desorption (TPD) analysis, BET surface area, X-ray diffraction (XRD) and scanning electron microscopic (SEM) analysis. Whereas, synthesized biodiesel fuel were fittingly characterized by Fourier transform infrared spectroscopy (FT-IR) as well as 1H and 13C Nuclear magnetic resonance (NMR) spectroscopic techniques.
Keywords: Boric acid, crude glycerol, green fuel, refined soybean oil, esterification, saponification