Article (Scientific journals)
Sol-gel synthesis of Ni/Al2O3 catalysts for toluene reforming: Support modification with alkali, alkaline earth or rare-earth dopant (Ca, K, Mg or Ce)
Claude, Vincent; Mahy, Julien; Lohay, Thimotée et al.
2020In Surfaces and Interfaces, 20, p. 100511
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Keywords :
Ni/Al2O3; Sol-Gel process; Toluene reforming; Oxide modification
Abstract :
[en] In this study, the influence of alkali, alkaline earth or rare-earth dopant (i.e. Ca, K, Mg or Ce) addition in 10 wt. % Ni/γ-Al2O3 catalyst were studied on the material physicochemical properties and catalytic activity. Twelve doped Ni/γ-Al2O3 catalysts were synthesized by sol-gel process in aqueous medium. One Ni/γ-Al2O3 catalyst without dopant was also synthesized as reference material. The addition of 1.5 wt. % of alkali (i.e. Ca, K or Mg) did not influence the acido-basicity properties of the catalysts due to low interactions with the support. All samples doped with 1.5 wt. % of oxide (i.e. Ca, K, Mg or Ce) presented a decrease of benzene selectivity up to 73% and a decrease of the amount of carbon deposit up to 40 %. These results were attributed to a higher degradation of the intermediate compounds of toluene and the carbonaceous compounds because of a higher amount of H2O and CO2 molecules adsorbed on these oxides. Among the different compositions of Ni/γ-Al2O3 catalysts doped with two different types of oxides (i.e. K+Ca) showed the most interesting performances with an increase of 20 % in conversion and a decrease of 10 % in carbon deposition. Therefore, it showed that low-cost elements (as Ca and K) can be added in small amount to increase the catalytic properties without the need of the expensive ceria element.
Disciplines :
Materials science & engineering
Chemical engineering
Author, co-author :
Claude, Vincent
Mahy, Julien  ;  Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry
Lohay, Thimotée
Tilkin, Rémi  ;  Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry
Micheli, Francesca
Lambert, Stéphanie  ;  Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry
Language :
English
Title :
Sol-gel synthesis of Ni/Al2O3 catalysts for toluene reforming: Support modification with alkali, alkaline earth or rare-earth dopant (Ca, K, Mg or Ce)
Publication date :
September 2020
Journal title :
Surfaces and Interfaces
eISSN :
2468-0230
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
20
Pages :
100511
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 March 2020

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