期刊
CATALYSTS
卷 9, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/catal9050411
关键词
nickel catalysts; ceria; alumina; glycerol steam reforming; H-2 production
资金
- program THALIS
- Hellenic Ministry of Education, Lifelong Learning and Religious Affairs
- European Social Fund
- Abu Dhabi Department of Education and Knowledge (ADEK) through the Award for Research Excellence (AARE) 2017
- Khalifa University [RCII-2018-024]
In this study, a critical comparison between two low metal (Ni) loading catalysts is presented, namely Ni/Al2O3 and Ni/AlCeO3 for the glycerol steam reforming (GSR) reaction. The surface and bulk properties of the catalysts were evaluated using a plethora of techniques, such as N-2 adsorption/desorption, Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy / Energy Dispersive X-Ray Spectroscopy (SEM/EDX, Transmission Electron Microscopy (TEM), CO2 and NH3- Temperature Programmed Desorption (TPD), and Temperature Programmed Reduction (H-2-TPR). Carbon deposited on the catalyst's surfaces was probed using Temperature Programmed Oxidation (TPO), SEM, and TEM. It is demonstrated that Ce-modification of Al2O3 induces an increase of the surface basicity and Ni dispersion. These features lead to a higher conversion of glycerol to gaseous products (60% to 80%), particularly H-2 and CO2, enhancement of WGS reaction, and a higher resistance to coke deposition. Allyl alcohol was found to be the main liquid product for the Ni/AlCeO3 catalyst, the production of which ceases over 700 degrees C. It is also highly significant that the Ni/AlCeO3 catalyst demonstrated stable values for H-2 yield (2.9-2.3) and selectivity (89-81%), in addition to CO2 (75-67%) and CO (23-29%) selectivity during a (20 h) long time-on-stream study. Following the reaction, SEM/EDX and TEM analysis showed heavy coke deposition over the Ni/Al2O3 catalyst, whereas for the Ni/AlCeO3 catalyst TPO studies showed the formation of more defective coke, the latter being more easily oxidized.
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