NDLI: Role of lattice oxygen in oxidative steam reforming of toluene as a tar model compound over Ni/La0.8Sr0.2AlO3 catalyst

Content Provider	Royal Society of Chemistry (RSC)
Author	Chin, Yin Chee Ang, Ming Li Oemar, Usman Kawi, Sibudjing Hidajat, Kus
Copyright Year	2015
Abstract	Catalytic steam reforming of tar with toluene as a model compound for production of synthesis gas (H2 and CO) was studied using Ni/LaAlO3, Ni/La0.8Sr0.2AlO3, Ni/La2O3, and Ni/α-Al2O3 catalysts prepared using a wet impregnation method. The Ni/La0.8Sr0.2AlO3 catalyst demonstrated the most superior catalytic performance in terms of both catalytic activity and coke resistance in the steam reforming of toluene. The presence of gas phase oxygen enhanced the catalytic performance of all four catalysts, with the extent of improvement being the greatest over the Ni/La0.8Sr0.2AlO3 catalyst. Catalyst characterization by X-ray diffraction (XRD), temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption of oxygen (TPD-O2) revealed that the superior catalytic performance of the Ni/La0.8Sr0.2AlO3 catalyst was a result of lattice distortion caused by strontium doping, which produced a higher concentration of oxygen vacancies on the catalyst surface. This lowered the activation energy of the migration of lattice oxygen, enhancing the mobility of lattice oxygen species, and also improved the adsorption abilities of gas phase oxygen species. Mobile lattice oxygen species (Olattice) favored the direct partial oxidation of toluene, whereas gas-phase oxygen possessed stronger oxidative abilities and favored the complete oxidation of toluene. Both mobile lattice oxygen and gas phase oxygen species actively suppressed coke formation and oxidized coke deposited on the catalyst surface, conferring coking resistance.
Starting Page	3585
Ending Page	3597
Page Count	13
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	5
Issue Number	7
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy00412h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen Toluene Photoemission spectroscopy Syngas X-ray crystallography Strontium Temperature-programmed reduction Adsorption Lanthanum aluminate Dopant Steam reforming Activation energy X-ray photoelectron spectroscopy Crystal structure
Content Type	Text
Resource Type	Article
Subject	Catalysis

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