Synthesis and characterization of sulfonated single-walled carbon nanotubes and their performance as solid acid catalyst |
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Authors: | Hao Yu Hongjuan Wang |
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Affiliation: | School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510641, PR China |
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Abstract: | Single-walled carbon nanotubes (SWCNTs) were treated with sulfuric acid at 300 °C to synthesize sulfonated SWCNTs (s-SWCNTs), which were characterized by electron microscopy, infrared, Raman and X-ray photoelectron spectroscopy, and thermo analysis. Compared with activated carbon, more sulfonic acid groups can be introduced onto the surfaces of SWCNTs. The high degree (∼20 wt%) of surface sulfonation led to hydrophilic sidewalls that allows the SWCNTs to be uniformly dispersed in water and organic solvents. The high surface acidity of s-SWCNTs was demonstrated by NH3 temperature-programmed desorption technique and tested by an acetic acid esterification reaction catalyzed by s-SWCNTs. The results show that the water-dispersive s-SWCNTs are an excellent solid acid catalyst and demonstrate the potential of SWCNTs in catalysis applications. |
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Keywords: | Carbon nanotube Surface modification Structural characterization Raman spectroscopy Surface reaction |
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