Ni Catalysts Supported on Modified Alumina for Diesel Steam Reforming

Catalysts

Antonios Tribalis³  George D. Panagiotou³  Kyriakos Bourikas¹  Labrini Sygellou²  Stella Kennou²  Spyridon Ladas²  Alexis Lycourghiotis³  Christos Kordulis³ 

[1] School of Science and Technology, Hellenic Open University, GR-26222 Patras, Greece;Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece;Department of Chemistry, University of Patras, GR-26504 Patras, Greece;

关键词: nickel catalyst;    diesel steam reforming;    doping;    basicity;    TPR;    DRS;    XPS;    PEM-Fuel Cells;   

DOI  :  10.3390/catal6010011

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.