Dongil, Ana Belén, Pastor Pérez, Laura, Escalona, Néstor, Sepúlveda-Escribano, Antonio
Carbon nanotube-supported Ni–CeO2 catalysts. Effect of the support on the catalytic performance in the low-temperature WGS reaction
Carbon. 2016, 101: 296-304. doi:10.1016/j.carbon.2016.01.103
URI: http://hdl.handle.net/10045/53072
DOI: 10.1016/j.carbon.2016.01.103
ISSN: 0008-6223 (Print)
Abstract: 
The low temperature water-gas shift (WGS) reaction has been studied over two commercial multiwall carbon nanotubes-supported nickel catalysts promoted by ceria. For comparison purposes, activated carbon-supported catalysts have also been studied. The catalytic performance and the characterization by N2 adsorption analysis, powder X-ray diffraction (XRD), temperature-programmed reduction with H2 (TPR-H2), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) analysis showed that the surface chemistry has an important effect on the dispersion of ceria. As a result, ceria was successfully dispersed over the carbon nanotubes (CNTs) with less graphitic character, and the catalyst afforded better activity in WGS than the catalyst prepared over massive ceria. Moreover, a 20 wt.% CeO2 loading over this support was more active than the analogous catalyst with a 40 wt.% loading. The ceria nanoparticles were smaller when the support was previously oxidized, however this resulted in a decrease of the activity.
Keywords:Carbon nanotubes-supported, Nickel catalysts, Ceria, Catalytic performance, Low-temperature WGS reaction
Elsevier
info:eu-repo/semantics/article