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Catalysts 2016, 6(1), 11; doi:10.3390/catal6010011

Ni Catalysts Supported on Modified Alumina for Diesel Steam Reforming

1
Department of Chemistry, University of Patras, GR-26504 Patras, Greece
2
School of Science and Technology, Hellenic Open University, GR-26222 Patras, Greece
3
Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece
4
Institute of Chemical Engineering Science (FORTH/ICE-HT), Stadiou Str. Platani, P.O. Box 1414, GR-26500 Patras, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Michalis Konsolakis
Received: 12 November 2015 / Revised: 18 December 2015 / Accepted: 7 January 2016 / Published: 13 January 2016
(This article belongs to the Special Issue Surface Chemistry and Catalysis)
View Full-Text   |   Download PDF [1536 KB, uploaded 13 January 2016]   |  

Abstract

Nickel catalysts are the most popular for steam reforming, however, they have a number of drawbacks, such as high propensity toward coke formation and intolerance to sulfur. In an effort to improve their behavior, a series of Ni-catalysts supported on pure and La-, Ba-, (La+Ba)- and Ce-doped γ-alumina has been prepared. The doped supports and the catalysts have been extensively characterized. The catalysts performance was evaluated for steam reforming of n-hexadecane pure or doped with dibenzothiophene as surrogate for sulphur-free or commercial diesel, respectively. The undoped catalyst lost its activity after 1.5 h on stream. Doping of the support with La improved the initial catalyst activity. However, this catalyst was completely deactivated after 2 h on stream. Doping with Ba or La+Ba improved the stability of the catalysts. This improvement is attributed to the increase of the dispersion of the nickel phase, the decrease of the support acidity and the increase of Ni-phase reducibility. The best catalyst of the series doped with La+Ba proved to be sulphur tolerant and stable for more than 160 h on stream. Doping of the support with Ce also improved the catalytic performance of the corresponding catalyst, but more work is needed to explain this behavior. View Full-Text
Keywords: nickel catalyst; diesel steam reforming; doping; basicity; TPR; DRS; XPS; PEM-Fuel Cells nickel catalyst; diesel steam reforming; doping; basicity; TPR; DRS; XPS; PEM-Fuel Cells
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tribalis, A.; Panagiotou, G.D.; Bourikas, K.; Sygellou, L.; Kennou, S.; Ladas, S.; Lycourghiotis, A.; Kordulis, C. Ni Catalysts Supported on Modified Alumina for Diesel Steam Reforming. Catalysts 2016, 6, 11.

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