| Summary: | 碩士 === 中山醫學大學 === 應用化學系碩士班 === 103 === Under the effects of energy crisis, biomass energy, with the strengths of renewability and low pollution, is considered as a substitute for petroleum to release the energy crisis in a short period of time. Reusing waste products is one goal of environmental sustainability and has become an option to add value to producers. SiO2 is obtained after the calcinations of waste silica gel(WSG) and waste experiment gloves(WG) above 800°C, and then thermal activation with Li2CO3 to prepare base catalysts for the transesterification of soybean oil. The prepared WSG and WG catalysts are characterized by field emission scanning electron microscope(FE-SEM), Brunauer–Emmett–Teller(BET) surface area measurements, X-ray diffraction(XRD), and the Hammett indicator is applied to obtain their physical and chemical properties. Effects of calcination temperatures, methanol/oil ratio(mol/mol), and catalyst amount (wt% of oil) on the activity of WSG and WG catalysts are also investigated. It is found that the catalyst of 2mol (Li2CO3)/mol (waste products) being calcined at 800 oC shows the optimum activity. Under the optimal reaction conditions of WSG and WG catalysts, this approach achieves 98.8% and 96.9% biodiesel conversion rates. The catalytic results reveal that the WSG and WG catalyst maintains its activity after five catalytic runs, revealing that this solid catalyst can be reused, without activation, to process low-quality oils. After the five catalytic runs, the biodiesel yield remains close to 83%. Moreover, having WSG and WG catalysts as the catalysts, different vegetable oil(corn oil, olive oil, coconut oil, canola oil, castor oil) and waste edible oil used as the materials for producing Biodiesel reveal favorable effects.
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