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Ni supported on CaO-MgO-Al 2 O 3 as a highly selective and stable catalyst for H 2 production via the glycerol steam reforming reaction

Charisiou, N.D., Papageridis, K.N., Tzounis, L., Sebastian, V., Hinder, S.J., Baker, M.A., AlKetbi, M., Polychronopoulou, K. and Goula, M.A. (2018) Ni supported on CaO-MgO-Al 2 O 3 as a highly selective and stable catalyst for H 2 production via the glycerol steam reforming reaction International Journal of Hydrogen Energy.

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Abstract

A comparative study of the GSR performance for Ni/CaO-MgO-Al2O3 and Ni/Al2O3 catalysts is reported. Catalysts were synthesized applying the wet impregnation method at a constant metal loading (8 wt %). Synthesized samples were characterized by N2 adsorption/desorption, ICP, BET, XRD, NH3-TPD, CO2-TPD, H2-TPR, XPS, TEM, STEM-HAADF and EDS. The carbon deposited on their surface under reaction conditions was characterized by TPO, Raman and TEM. It was proven that the use of CaO-MgO as alumina modifiers leads to smaller nickel species crystallite size, increased basicity and surface amount of Ni0 phase. Thus, it increases the conversion to gaseous products favoring H2 and CO2 production to the detriment of CO formation, by enhancing the water gas-shift (WGS) reaction. No liquid products were produced by the Ni/modAl catalyst over 550 °C, whereas time on stream results confirmed that deactivation can be prevented, as apart from decreasing the amount of coke deposition the nature of carbon was altered towards less graphitic and more defective structures.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Charisiou, N.D.
Papageridis, K.N.
Tzounis, L.
Sebastian, V.
Hinder, S.J.
Baker, M.A.M.Baker@surrey.ac.uk
AlKetbi, M.
Polychronopoulou, K.
Goula, M.A.
Date : 17 March 2018
Identification Number : 10.1016/j.ijhydene.2018.02.165
Copyright Disclaimer : © 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved
Uncontrolled Keywords : Glycerol steam reforming; H2 production; Ni catalysts; CaO-MgO doping; Al2O3 modifiers
Depositing User : Clive Harris
Date Deposited : 16 Apr 2018 14:31
Last Modified : 17 Apr 2018 07:26
URI: http://epubs.surrey.ac.uk/id/eprint/846230

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