Journal
RSC ADVANCES
Volume 6, Issue 77, Pages 73887-73896Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra07635a
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Funding
- National Science Council of the Republic of China [MOST 97-2218-E-040-003]
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The CO2 reforming of CH4 to H-2 over a catalyst is an effective method for renewable energy generation. In this study, SBA-15 and CNT were chosen as supports for the Ni-based catalysts prepared by the impregnation method. The FESEM images demonstrated that NiO particles were rhombic and well distributed on the SBA-15 surface. The XRD patterns showed that the chemical state of Ni changed after the reforming reaction; the main crystals on the fresh and spent Ni/SBA-15 were found to be NiO and Ni-0. The catalytic performance of Ni/SBA-15 in CO2/CH4 reforming was found to be superior to that of Ni/CNT. The results of the TGA and BET analysis demonstrated that spent Ni/SBA-15 (at 600 degrees C) showed no catalytic decay as an insignificant amount of coke was deposited on the catalyst supports. Moreover, Ni-based bimetallic catalysts were studied for the reforming reaction, and the activity of the catalysts with respect to metals was observed to follow a particular order: Cu-Ni > Mg-Ni > Co-Ni > Ca-Ni > Mn-Ni. The Cu-Ni/SBA-15 catalyst exhibited higher catalytic activity at a reaction temperature of 650 degrees C as compared to the others; the H-2 yield (40%) was not decreased as the reaction time increased, and the conversion of CO2 and CH4 is 77% and 75%, respectively.
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