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

Authors :
Hai-Ying Chen
Zheng-Wei Cui
Source :
Catalysts, Vol 6, Iss 12, p 211 (2016)
Publication Year :
2016
Publisher :
MDPI AG, 2016.

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.

Details

Language :
English
ISSN :
20734344
Volume :
6
Issue :
12
Database :
Directory of Open Access Journals
Journal :
Catalysts
Publication Type :
Academic Journal
Accession number :
edsdoj.53cd5ff7b86440109416156c4dfd1dbd
Document Type :
article
Full Text :
https://doi.org/10.3390/catal6120211