86404 20200716101605.0 doi 10.3390/catal9050411 sideral 115095 ART-2019-115095 eng Charisiou, Nikolaos D. Nickel supported on AlCeO3 as a highly selective and stable catalyst for hydrogen production via the glycerol steam reforming reaction 2019 Access copy available to the general public Unrestricted 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 N2 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 (H2-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 H2 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 °C. It is also highly significant that the Ni/AlCeO3 catalyst demonstrated stable values for H2 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. info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 3.52 2019 CHEMISTRY, PHYSICAL 65 / 158 = 0.411 2019 Q2 T2 0.722 2019 Physical and Theoretical Chemistry 2019 Q2 Catalysis 2019 Q3 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Siakavelas, Georgios I. Dou, Binlin (orcid)0000-0002-6873-5244 Sebastian, Víctor Universidad de Zaragoza Hinder, Steven J. Baker, Mark A. Polychronopoulou, Kyriaki Goula, Maria A. 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 9, 5 (2019), 411 [21 pp.] Catalysts CATALYSTS 2073-4344 1911963 http://zaguan.unizar.es/record/86404/files/texto_completo.pdf Versión publicada 108709 http://zaguan.unizar.es/record/86404/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:86404 articulos driver 2020-07-16-09:54:35 ARTICLE