A Mesoporous SiO2/gamma-Fe2O3/KI Heterogeneous Magnetic Catalyst for the Green Synthesis of Biodiesel

作者：Macedo Alice L; Fabris Jose D^*; Pires Manoel J M; Oliveira Wanessa L; Ardisson Jose D; Augusti Rodinei; Aragon Fermin H; Santos Ricardo S; Oliveira Luizc A; Pereira Marcio C

来源：Journal of the Brazilian Chemical Society, 2016, 27(12): 2290-2299.

DOI：10.5935/0103-5053.20160124

• biofuel
• transesterification
• heterogeneous catalyst
• palm oil
• soybean oil

A magnetic catalyst (sample MCat) consisting of KI supported on a mixture of silica and maghemite (gamma-Fe2O3) was prepared and used in the transesterification reaction for the synthesis of biodiesel. The energy dispersive X-ray spectrum of the catalyst showed signals due to Si, Fe, K, and I. Powder X-ray diffraction data revealed the amorphous nature of the SiO2 and the duly impregnation of the support with KI. Fe-57 Mossbauer spectroscopy and magnetization measurements confirmed the ferrimagnetic iron oxide in the catalyst to be maghemite. N-2 adsorption-desorption data indicated that the silica is mesoporous with a specific area of 352 m(2) g(-1), enabling the impregnation of 40 and 11 wt.% of KI and maghemite, respectively, according to the chemical composition obtained by the X-ray fluorescence measurements. The MCat was found to be efficient in the transesterification reaction in the macauba and soybean oils. The MCat was easily removed from the reaction medium, with a hand magnet, and efficiently reused for more four consecutive reaction cycles. The good catalytic activity along with its magnetic behavior, high chemical stability and recyclability make the MCat a suitable material for the green synthesis of biodiesel.

• 出版日期2016-12