Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 37, Issue 13, Pages 10135-10144Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.03.158
Keywords
Syngas production; Methane dry reforming; Nickel catalyst; Zirconia-silica; Pretreatment gas
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Funding
- Singapore Agency for Science, Technology and Research (A*STAR), SERC [102 101 0020]
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Carbon dioxide reforming of methane to synthesis gas was studied over Ni/ZrO2-SiO2 catalyst under different pretreatment atmospheres. Characterization using powder X-ray diffraction, H-2 temperature-programmed reduction, H-2 temperature-programmed hydrogenation, TG/DTA, XPS, Raman spectra and transmission electron microscopy techniques revealed that gas atmospheres employed in the catalyst pretreatment have a significant influence on the catalytic performance. The helium-pretreated catalyst was found to be the most suitable catalyst for this application, showing the improved catalytic performance. More specifically, helium pretreatment facilitated the generation of well-distributed active metal sites while the heterogeneity of Ni components upon H-2 pretreatment degraded catalytic activity of metal sites considerably. Pretreatment under CO atmosphere resulted in the formation of carbon encapsulated metal species thus causing catalyst deactivation severely. Inefficient reduction under CH4 activation and the presence of a great amount of carbonaceous species, disfavor the production of synthesis gas during the dry reforming. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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