Document Type : Research Article
Authors
- Ioannis Tsiaoussis 1
- Nikos D. Charisiou 2
- Maria A. Goula 2
- Lazaros Tzounis 3
- George Vourlias 1
- oannis V. Yentekakis 4
- Remi Chassagnon 5
- Valerie Potin 5
- Bruno Domenichini 5
1 Physics Department, Aristotle University Thessaloniki, Thessaloniki 54124, Greece
2 Laboratory of Alternative Fuels and Environmental Catalysis, Department of Environmental and Pollution Control Engineering, Western Macedonia University of Applied Sciences, Koila, Kozani, 50100, Greece
3 Composite and Smart Materials Laboratory (CSML), Department of Materials Science & Engineering, University of Ioannina, Ioannina 45110, Greece
4 Schoοl of Environmental Engineering, Technical University of Crete, Chania 73100, Greece
5 ICB, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, BP 47870, Dijon F-21078, France
Abstract
In the present work, we investigated the structural morphology of carbon species deposited on nickel catalysts supported on CeO2-ZrO2 (18.8 wt.% ceria), prepared by wet impregnation, during the dry reforming of methane (DRM) reaction by using Thermo-gravimetric Analysis (TGA), Raman Spectroscopy, X-ray diffraction (XRD), High Resolution Transmission
Electron Microscopy (HRTEM) and Scanning Transmission Electron Microscopy- Energy dispersive spectroscopy
(STEM-EDS). TGA results show that the amount of deposited carbon decreases upon increasing reaction temperature, which is consistent with the thermodynamics of the reactions responsible for carbon formation, and Raman analysis points to a simultaneous increase in its graphitization degree. XRD measurements reveal the existence of 2H-Graphite and TEM imaging mode as well as SAED patterns depict that in all temperatures under which the catalysts were tested (550, 650, 750 and 800 oC), the formation of multi wall carbon nanotubes (MWCNT). HRTEM observations also reveal that the Ni nanoparticles are often enclosed by the MWCNT. HRTEM images identify nanocrystalline areas with a tetragonal phase, P42/nmc(137), of Ce1-xZrxO2, and STEM-EDS analysis at the nanometer scale confirms a correlation between Ce and Zr in the average atomic ratio (% ), 1 to 5.19 - 6.94 respectively. The results presented herein confirm that biogas mixtures can be used as precursors for the production of MWCNTs. Copyright © 2017 VBRI Press
Keywords
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