Peanut Shell-Derived Carbon Solid Acid with Large Surface Area and Its Application for the Catalytic Hydrolysis of Cyclohexyl AcetateReportar como inadecuado


Peanut Shell-Derived Carbon Solid Acid with Large Surface Area and Its Application for the Catalytic Hydrolysis of Cyclohexyl Acetate


Peanut Shell-Derived Carbon Solid Acid with Large Surface Area and Its Application for the Catalytic Hydrolysis of Cyclohexyl Acetate - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Hebei Provincial Key Laboratory of Green Chemistry and High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China





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Academic Editor: Francisco del Monte

Abstract A carbon solid acid with large surface area CSALA was prepared by partial carbonization of H3PO4 pre-treated peanut shells followed by sulfonation with concentrated H2SO4. The structure and acidity of CSALA were characterized by N2 adsorption–desorption, scanning electron microscopy SEM, X-ray powder diffraction XRD, 13C cross polarization CP-magic angle spinning MAS nuclear magnetic resonance NMR, X-ray photoelectron spectroscopy XPS, Fourier transform-infrared spectroscopy FT-IR, titration, and elemental analysis. The results demonstrated that the CSALA was an amorphous carbon material with a surface area of 387.4 m2-g. SO3H groups formed on the surface with a density of 0.46 mmol-g, with 1.11 mmol-g of COOH and 0.39 mmol-g of phenolic OH. Densities of the latter two groups were notably greater than those observed on a carbon solid acid CSA with a surface area of 10.1 m2-g. The CSALA catalyst showed better performance than the CSA for the hydrolysis of cyclohexyl acetate to cyclohexanol. Under optimal reaction conditions, cyclohexyl acetate conversion was 86.6% with 97.3% selectivity for cyclohexanol, while the results were 25.0% and 99.4%, respectively, catalyzed by CSA. The high activity of the CSALA could be attributed to its high density of COOH and large surface area. Moreover, the CSALA showed good reusability. Its catalytic activity decreased slightly during the first two cycles due to the leaching of polycyclic aromatic hydrocarbon-containing SO3H groups, and then remained constant during following uses. View Full-Text

Keywords: carbon solid acid; peanut shell; large surface area; cyclohexyl acetate; hydrolysis carbon solid acid; peanut shell; large surface area; cyclohexyl acetate; hydrolysis





Autor: Wei Xue, Lijun Sun, Fang Yang, Zhimiao Wang and Fang Li *

Fuente: http://mdpi.com/



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