期刊
COMPTES RENDUS CHIMIE
卷 21, 期 7, 页码 676-683出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2018.04.003
关键词
Combustion synthesis; Calcium aluminate; Carbonated nanocatalyst; Microwave irradiation; Biodiesel; Canola oil
资金
- Ferdowsi University of Mashhad [32009]
- Sahand University of Technology
- Iran Nanotechnology Initiative Council [80968]
In this study, a carbon-supported KOH/Ca12Al14O33 nanocomposite was fabricated via the microwave combustion method, in which dextrose was used as a carbon source, and its activity in the microwave-assisted transesterification reaction as a microwave absorption material was assessed. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry, Brunauer-Emmett-Teller (BET), field-emission scanning electron microscopy, and energy dispersive X-ray analyses. The results showed that the carbonate and noncarbonate samples had a calcium aluminate (Ca12Al14O33) structure as a support. Different carbon groups were formed during preparation of the carbon-supported KOH/Ca12Al14O33 nanocomposite, which improved its surface area and porosity. Although the samples presented similar basicity, the carbonated nanocomposite exhibited twice as much activity as the KOH/Ca12Al14O33 nanocatalyst for conversion of canola oil to biodiesel in the microwave-assisted transesterification reaction at 270 W microwave power. The nanocomposite with a larger pore size made active sites easily accessible and exhibited higher catalytic ability where the conversion of 98.8% was obtained under the optimized conditions of 270 W microwave power, methanol/oil molar ratio of 15, 4 wt% of the nanocomposite, and 30 min of reaction time. The carbon-supported nanocatalyst can be reused for at least four times with less reduction in activity. Furthermore, the obtained biodiesel showed that it met the standard values (EN 14214 and ASTM D-6751) with respect to the density, kinematic viscosity at 40 degrees C, acid number, and flash point. (C) 2018 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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