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Catalysts 2016, 6(12), 211; doi:10.3390/catal6120211

A Microwave-Sensitive Solid Acid Catalyst Prepared from Sweet Potato via a Simple Method

Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, School of Mechanical Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China
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Academic Editor: Ivan V. Kozhevnikov
Received: 16 October 2016 / Revised: 8 December 2016 / Accepted: 12 December 2016 / Published: 17 December 2016
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Abstract

In this study, a microwave-sensitive solid acid catalyst was successfully synthesized from sweet potatoes via a simple process. The catalyst was proven to have superior microwave-sensitive and homogeneous properties. The physicochemical properties were characterized by Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), Fourier-transform infrared spectra (FT-IR), thermogravimetric (TGA), scanning electron microscope (SEM) and elemental analysis (EA). Results showed that the total acid density and specific surface area for the catalyst were 6.35 mmol/g and 78.35 m2/g, respectively. The elemental sulfur content reached 7.449% after sulfonation and the catalytic activity could reach over 91% within 30 min with microwave power density of 1.0 W/mL. The catalytic reaction temperature should not exceed 200 °C, as shown in TGA curve, and the moisture content in the oil raw material should be within 1%–2%. The catalyst deactivated gradually to 64.38% after reutilization five times, but the catalytic activity could be simply regenerated by re-sulfonation, albeit slightly reduced (87.56%). The shift of diffraction peaks in the XRD patterns and new absorption peaks at 619.98 and 1190.49 cm−1 of FT-IR spectra demonstrated that the –SO3H group was effectively attached to the catalyst. The SEM images displayed a loose and porous amorphous structure in the end catalyst. View Full-Text
Keywords: solid acid catalyst; sweet potato; microwave sensitive; simple method solid acid catalyst; sweet potato; microwave sensitive; simple method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, H.-Y.; Cui, Z.-W. A Microwave-Sensitive Solid Acid Catalyst Prepared from Sweet Potato via a Simple Method. Catalysts 2016, 6, 211.

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