RESEARCH ARTICLE


Changes on Texture and Crystalline Phase of Activated Carbon-Supported Ni-Ca Catalyst During Dry Methane Reforming



Juan Matos*, 1, Maibelin Rosales1, Gema González1, Caribay Urbina de Navarro2
1 Engineering of Materials and Nanotechnology Centre, Venezuelan Institute for Scientific Research, I.V.I.C., 20632, Caracas 1020-A, Venezuela
2 Centre for Electron Microscopy, Central University of Venezuela, Caracas 1040, Venezuela


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© 2010 Matos et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Engineering of Materials and Nanotechnology Centre, Venezuelan Institute for Scientific Research, I.V.I.C., 20632, Caracas 1020-A, Venezuela; Tel/Fax: +58-212-5041922; E-mail: jmatos@ivic.gob.ve


Abstract

Changes on texture and crystalline phase of AC-supported Ni-Ca catalyst during dry methane reforming were verified. Characterization by N2 adsorption, XPS, XRD, TEM and HR-TEM was performed. XPS and XRD analysis suggest that the initial activity can be attributed to a nickel reduced phase formed during helium pre-treatment. TEM showed that a homogeneous distribution of Ni nanoparticles between 10-20nm at the tip of multi-walled carbon nanotubes is formed during reaction. HR-TEM showed diffusion of Ni nanoparticles and the formation of carbon-like nano onions with an interlayer separation of 0.5nm suggesting the formation of a ultra-microporous carbon structure. An increase in surface area from 231m2.g-1 to 2405m2.g-1 after 90min reaction was found and attributed to an in situ activation of carbon deposits by CO2 gasification. The present results suggest that introducing CO2 pulses during reaction carbon-supported Ni-Ca could be employed as potential catalysts for methane and other hydrocarbon reforming reactions at mild experimental conditions.

Keywords: Activation, Carbon deposits, Dry methane reforming, Ni-based catalyst.