کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4998726 | 1460399 | 2017 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Influence of fuel type on microwave-enhanced fabrication of KOH/Ca12Al14O33 nanocatalyst for biodiesel production via microwave heating Influence of fuel type on microwave-enhanced fabrication of KOH/Ca12Al14O33 nanocatalyst for biodiesel production via microwave heating](/preview/png/4998726.png)
- Fabrication of calcium aluminate by the microwave-enhanced combustion method.
- Confirmation of the effect of fuel type on properties of nanopowder.
- Transformation from CaAl2O4 to Ca12Al14O33 structure during KOH impregnation.
- Microwave-assisted biodiesel production using KOH/Ca12Al14O33 nanocatalysts.
- Sample prepared by urea as fuel showed high crystallinity, surface area and activity.
Microwave irradiation has attracted a great deal of attention when it comes to synthesis of organic and inorganic materials. In the present study, a microwave heating system was utilized to prepare KOH/Ca12Al14O33 nanocatalysts via combustion method, so as to produce biodiesel from canola oil. Moreover, the effect of carbon content of fuels such as urea, ammonium acetate, glycerol and diethylene glycol used in the combustion reaction on the properties of the synthesized nanocatalysts was evaluated. The samples were analyzed by XRD, FTIR, TGA, BET-BJH, FESEM, and EDX techniques, with their basicity levels evaluated by Hammett indicator. The results showed that the combustion temperature tends to decrease with an increase in carbon content of fuel. Accordingly, the supports synthesized by urea and ammonium acetate exhibited the best crystalline structures. However, all samples showed Ca12Al14O33 structure during impregnation by KOH and calcination step. The samples prepared by urea and ammonium acetate, as fuel, presented appropriate percentages of material-to-parent solution ratio, bringing about higher activities. Among them, the KOH/Ca12Al14O33 synthesized by urea had the largest surface area and activity, so that it succeeded to convert 83.5% of canola oil to biodiesel via microwave irradiation at microwave power of 450 W, methanol-to-oil molar ratio of 12, catalyst concentration of 4 wt. %, and reaction time of 60 min. The sample showed high reusability when it was calcined at 700°C after each round of reaction.
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Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 75, June 2017, Pages 148-155