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Title: High performance of Mg-La mixed oxides supported Ni catalysts for dry reforming of methane: The effect of crystal structure
Authors: Ni, J.
Chen, L.
Lin, J.
Schreyer, M.K.
Wang, Z.
Kawi, S. 
Keywords: Dry reforming of methane
La 2O2CO3
Mg-La mixed oxides
Ni catalysts
Issue Date: 17-Oct-2013
Citation: Ni, J., Chen, L., Lin, J., Schreyer, M.K., Wang, Z., Kawi, S. (2013-10-17). High performance of Mg-La mixed oxides supported Ni catalysts for dry reforming of methane: The effect of crystal structure. International Journal of Hydrogen Energy 38 (31) : 13631-13642. ScholarBank@NUS Repository.
Abstract: A series of mixed Mg-La oxide supports with various Mg2+/La 3+ mole ratios were prepared via co-precipitation of Mg and La nitrates, and then impregnated to form 5 wt.% Ni catalysts. The as-prepared catalysts were evaluated in DRM reaction for 200 h and characterized by means of in situ DRIFTS, XRD, TEM, CO2-TPD, XPS, and TGA. It was found that the interaction of suitable amount of MgO with La2O3 stabilized cubic La2O3 species in catalysts, which has high basicity to adsorb CO2 forming monoclinic La2O 2CO3 (Ia) species in DRM reaction. The introduction of MgO also created surface oxygen ions (i.e. O-). Both monoclinic La 2O2CO3 (Ia) and surface oxygen species are able to oxidize and remove deposited carbon, keeping the Ni catalyst at high activity and stability. Low Mg2+/La3+ ratios generated hexagonal La2O3 and La2O2CO 3 (II) in DRM reaction. The hexagonal La2O 2CO3 (II) did not play significant role in carbon removal so that the catalysts deactivated fast. Copyright © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Source Title: International Journal of Hydrogen Energy
ISSN: 03603199
DOI: 10.1016/j.ijhydene.2013.08.041
Appears in Collections:Staff Publications

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