Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (11): 1949-1965.DOI: 10.1016/S1872-2067(16)62518-4

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Influence of the synthesis method parameters used to prepare nickel-based catalysts on the catalytic performance for the glycerol steam reforming reaction

M. A. Goula, N. D. Charisiou, K. N. Papageridis, G. Siakavelas   

  1. Technological Education Institution of Western Macedonia, School of Technological Applications, Department of Environmental and Pollution Control Engineering, Laboratory of Alternative Fuels and Environmental Catalysis, GR-50100 Koila, Kozani, Greece
  • Received:2016-05-31 Revised:2016-07-24 Online:2016-11-25 Published:2016-11-25
  • Contact: M. A. Goula,Tel:+30-2461068296; Fax:+30-2461039682; E-mail:mgoula@teiwm.gr

Abstract:

The influence of the synthesis method parameters used to prepare nickel-based catalysts on the catalytic performance for the glycerol steam reforming reaction was studied. A series of Al2O3-supported Ni catalysts were synthesized, with nickel loading of 8 wt%, using the incipient wetness, wet impregnation, and modified equilibrium deposition filtration methods. The catalysts' surface and bulk properties were determined by inductively coupled plasma (ICP), N2 adsorp-tion-desorption isotherms (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and temperature-programmed reduction (TPR). Used catalysts were characterized by techniques such as elemental analysis and SEM in order to deter-mine the level of carbon that was deposited and catalyst morphology. The results indicated that the synthesis method affected the textural, structural and surface properties of the catalysts, differenti-ating the dispersion and the kind of nickel species on alumina's surface. The formation of nickel aluminate phases was confirmed by the XRD and TPR analysis and the β-peak of the Ni/Al-edf cata-lyst was higher than in the other two catalysts, indicating that the nickel aluminate species of this catalyst were more reducible. Both Ni/Al-wet and Ni/Al-edf catalysts showed increasing CO2 selec-tivities and approximately constant CO selectivities for temperatures above 550℃, indicating that these catalysts successfully catalyze the water gas shift reaction. It was also confirmed that the Ni/Al-edf catalyst had the highest values for glycerol to gaseous products conversion, hydrogen yield, allyl alcohol, acetaldehyde, and acetic acid selectivities at 650℃ and the lowest carbon depo-sition of the catalysts tested. The correlation of the catalysts' structural properties, dispersion and reducibility with catalytic performance reveals that the EDF method can provide catalysts with higher specific surface area and active phase's dispersion, that are easier to reduce, more active and selective to hydrogen production, and more resistant to carbon deposition.

Key words: Glycerol, Hydrogen, Steam reforming, Supported nickel catalyst, Catalyst preparation