Issue 4, 2016

Hydrodeoxygenation of guaiacol over Ni/carbon catalysts: effect of the support and Ni loading

Abstract

Commercial carbon nanotubes (CNT), oxidized CNT (CNTox) and activated carbon (AC) were used as supports to prepare Ni/C catalysts with a nominal loading of 15 wt%. In addition, xNi/CNT catalysts with loadings of x: 10, 12, 15, 17, 20 wt% were prepared. The catalysts were characterized by N2 physisorption, temperature-programmed decomposition (TPD), potentiometric titration, H2-temperature programmed reduction (TPR), CO chemisorption and X-ray photoelectron spectroscopy (XPS). The catalysts were evaluated for the conversion of guaiacol at 573 K and 5 MPa H2 pressure for 4 h in a batch reactor. The activity of the xNi/CNT catalysts was related to Ni dispersion, while their selectivity was similar and favored the formation of hydrogenation products. The activity of 15Ni/CNT catalyst was higher than those of 15Ni/CNTox and 15Ni/AC catalysts. The higher activity of the 15Ni/CNT catalyst compared to 15Ni/AC catalyst was possibly due to their different morphologies, while the lower activity of the 15Ni/CNTox catalyst was attributed to the limiting effect of surface oxygen groups on the support. In addition, the higher acidity of the 15Ni/CNTox catalyst enhanced its hydrogenolysis and deoxygenation capacities.

Graphical abstract: Hydrodeoxygenation of guaiacol over Ni/carbon catalysts: effect of the support and Ni loading

Supplementary files

Article information

Article type
Paper
Submitted
27 Okt 2015
Accepted
21 Dez 2015
First published
23 Dez 2015

RSC Adv., 2016,6, 2611-2623

Hydrodeoxygenation of guaiacol over Ni/carbon catalysts: effect of the support and Ni loading

A. B. Dongil, I. T. Ghampson, R. García, J. L. G. Fierro and N. Escalona, RSC Adv., 2016, 6, 2611 DOI: 10.1039/C5RA22540J

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