NDLI: Catalytic features of Ni supported on CeO<sub>2</sub>–ZrO<sub>2</sub> solid solution in the steam reforming of glycerol for syngas production

Content Provider	Royal Society of Chemistry (RSC)
Author	Assaf, Elisabete Moreira Maia, Thaisa Aparecida
Copyright Year	2014
Abstract	Catalysts containing 5 wt% Ni supported on CexZr1−xO2 solid solutions prepared by the Pechini method were tested in steam reforming of glycerol (SRG) reactions. The catalysts were characterized by temperature programmed reduction with H2 (H2-TPR), XANES with H2-TPR, X-ray diffraction (XRD) for fresh and used catalysts, XRD in situ for reduced catalysts, N2-physisorption, oxygen storage capacity (OSC), and scanning electron microscopy (SEM). H2-TPR analysis revealed various degrees of interaction between the NiO phase and the supports, which were confirmed by XANES analysis. XANES data also showed greater reduction of mixed supports, than of pure supports, showing that the presence of Zr4+ promotes CeO2–ZrO2 reduction. XRD confirmed the formation of CeO2–ZrO2 solid solutions, with cubic and tetragonal crystal structures, depending on the composition. N2 physisorption analysis showed a greater surface area on the CeO2–ZrO2 solid solution supports than on the pure supports and this increase may be related to the insertion of ZrO2 in the CeO2 lattice. The SRG reaction was performed at 973 K with molar feed ratios of H2O–glycerol = 3 : 1. All catalysts exhibited catalytic activity for the reaction, but carbon formation was high on the catalysts supported on pure oxide. The 5% Ni50CZ catalyst was the most selective for syngas production in the SRG. In addition to the nickel activity, the experiments revealed the activity of the supports in oxidation reactions, which was assigned to the formation of oxygen vacancies by the interaction of CeO2 with ZrO2.
Starting Page	31142
Ending Page	31154
Page Count	13
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	59
Journal	RSC Advances
DOI	10.1039/c4ra02886d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen X-ray absorption near edge structure Tetragonal crystal system Glycerol SRG Concentration Solid solution Physisorption Scanning electron microscope Carbon Syngas X-ray crystallography Oxygen storage Steam reforming Nickel Zirconium dioxide OSC Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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