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Title: | Hydrothermal stability improvement of NiPt-containing γ-Al2O3 catalysts tested in aqueous phase reforming of glycerol/water mixture for H2 production |
Authors: | El Doukkali, M. Iriondo, A. Miletic, Nemanja Cambra, J.F. Arias, P.L. |
Journal: | International Journal of Hydrogen Energy |
Issue Date: | 2017 |
Abstract: | The hydrothermal stability of Ni and NiPt-containing g-Al2O3 catalysts in aqueous phase reforming (APR) of glycerol/water mixture (C3H8O3/H2O, 10% w/w) was investigated putting in evidence the influence of the preparation method; sol-gel in basic medium (SGB) and impregnation on an in-house prepared sol-gel g-Al2O3 support (SGI). All developed catalysts were characterized by ICP-AES, TPR-H2, in-situ heating XRD-O2, DSC/TG-N2/O2 and ex-situ reduction of XRD-H2, N2 physisoption and TEM techniques. The results indicate that SGI method and calcination treatment at 750 C were crucial in extending the catalytic useful life of NiPt-containing g-Al2O3 catalysts, resulting in an adequate distribution of Ni-Pt metallic particles and good stability of g-Al2O3 support against the severe hydrothermal conditions of APR process. The SGI method led to form stable NiPt catalysts with relatively big Ni particles and stable hydrothermal properties of g-Al2O3 support, while the SGB catalysts exhibited well-dispersed Ni particles but unstable catalytic behavior. These last catalysts presented high glycerol conversions during the first hours of APR glycerol/water reaction, however, an important decrease in terms of glycerol conversion was observed after 24 h time-on-stream. The experimental results suggested that the most suitable stable and active catalyst was the NiPt/ASGI7 (better than >NiPt/ASGI6 > NiPt/ASGI5 >>> NiPt/ASGB7). This catalyst showed best catalytic activity and good catalytic stability along 56 h of time-on-stream, reaching, at steady state, highest total glycerol conversion (z79%) and glycerol into gaseous products (z57%) in APR reaction of glycerol/water mixture for hydrogen generation. |
URI: | https://scidar.kg.ac.rs/handle/123456789/19845 |
Type: | article |
DOI: | 10.1016/j.ijhydene.2017.04.218 |
ISSN: | 03603199 |
Appears in Collections: | Faculty of Agronomy, Čačak |
Files in This Item:
File | Description | Size | Format | |
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30 International Journal of Hydrogen Energy (2017).pdf Restricted Access | 2.45 MB | Adobe PDF | View/Open |
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