Reference : Sol-gel synthesis of Ni/Al2O3 catalysts for toluene reforming: Support modification w...
Scientific journals : Article
Engineering, computing & technology : Chemical engineering
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/246080
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)
English
Claude, Vincent []
Mahy, Julien mailto [Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry >]
Lohay, Thimotée []
Tilkin, Rémi mailto [Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry >]
Micheli, Francesca []
Lambert, Stéphanie mailto [Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry >]
Sep-2020
Surfaces and Interfaces
Elsevier
20
100511
Yes (verified by ORBi)
International
2468-0230
Amsterdam
Netherlands
[en] Ni/Al2O3 ; Sol-Gel process ; Toluene reforming ; Oxide modification
[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.
http://hdl.handle.net/2268/246080
10.1016/j.surfin.2020.100511

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