Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 28, Pages 14183-14198Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.03.149
Keywords
One-pot hydrothermal synthesis; Impregnation; Glycerol steam reforming; Mesoporous silica; Co-Ni bimetallic Catalysts; MgO modified-SBA-15 catalysts
Categories
Funding
- National Science Foundation (NSF) [HRD-124215]
- Dept. Chair of Energy and Environmental Systems
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Steam reforming of glycerol was carried out using Si-based mesoporous SBA-15 catalysts. Different mesoporous catalysts- Co-SBA-15, Ni-SBA-15, Co-MgO-SBA-15, Ni-MgO-SBA-15, and Co-Ni-SBA-15 were prepared using a one-pot hydrothermal method. An incipient wetness impregnation method was used only for the bimetallic Co-Ni-SBA-15 catalyst (catalyst designated as Co-Ni-SBA-15-IMPG) to compare its activity to that prepared by the one-pot method. The catalysts were characterized using XRD, TPR, TEM, TGA-DSC, ICP-OES and N-2 adsorption-desorption analytical techniques. A high surface area in the range of 540 -750 m(2)/g was observed depending on the catalyst composition. The glycerol steam reforming (GSR) activity of the catalysts was studied in the reaction temperature range of 450 degrees C-700 degrees C for hydrogen production. Results from the GSR studies for continuous 40 h showed that both Co-Ni-SBA-15-IMPG (impregnation) and Co-Ni-SBA-15 (one-pot) were resistant to deactivation, and both yielded 100% glycerol conversion for the entire 40 h. 10% Co-5%Ni-SBA-15 and 10%Co-5%Ni-SBA-15-IMPG produced (70-78) % and (60-78) % H-2 selectivity, respectively. Addition of MgO to Co-SBA-15 and Ni-SBA-15 increased the activity and stability of the catalysts. The catalyst stability performance followed the trend 10%Co-5%Ni > 10%Co-5%MgO >10%Co-5%Ni-IMPG. > 15%Co > 10%Ni-5%MgO >15%NiSBA-15. Thermal analyses of the spent catalyst showed a substantial amount of coke deposition which could be the major factor responsible for catalysts deactivation. Bimetallic catalysts prepared by one-pot method (10%Co-5%Ni-SBA-15) and incipient wetness impregnation (10%Co-5%Ni-SBA-15-IMPG) exhibited remarkable GSR activity compared to their monometallic counterparts. The GSR activity was observed in the order: 10%Co-5% Ni-IMPG > 10%Co-5%Ni > 10%Co-5%MgO >15%Co > 15%Ni > 10%Ni-5%MgO. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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