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Title: Low temperature dry reforming of methane on rhodium and cobalt based catalysts: active phase stabilization by confinement in mesoporous SBA-15
Authors: Hassan, Nissrine El 
Kaydouh, Marie-Nour
Geagea, Henry
El Zein, H
Jabbour, Karam 
Casale, Sandra
Zakhem, Henri El 
Massiani, Pascale
Affiliations: Department of Chemical Engineering 
Department of Chemical Engineering 
Department of Chemical Engineering 
Keywords: Rhodium
Methane dry reforming
Confinement effect--Concile
Issue Date: 2016
Part of: Applied catalysis A: General
Volume: 520
Issue: 6
Start page: 114
End page: 121
Two silica supports either non porous (SiO2) or mesoporous (SBA-15) were impregnated with cobalt (12 wt%) in order to study the confinement effect on catalytic performances in dry reforming of methane. Further increase of activity was obtained by adding small amounts of rhodium (0.2 and 0.5 wt%) to the Co/SBA-15 catalyst. The structural and morphological properties of the calcined samples were characterized by N2 sorption, X-ray diffraction and high-resolution transmission electron microscopy (ultra-thin sections). Their reducibility was studied by temperature-programmed reduction. After in situ reduction of the materials, their catalytic activity was tested in dry reforming of methane up to 800 °C followed by stability testing at 550 °C for 550 min. Cobalt confinement in the mesopores of SBA-15 is shown to be highly beneficial towards not only activity but also stability, the reduced nanoparticles being then more resistant against sintering under stream. Rh plays a role as an additional active phase. It also strongly favors cobalt stabilization in the mesopores by permitting its reduction at a much lower temperature, which allows avoiding metal migration to the surface of the silica grains. The nature of coke is also shown to depend on rhodium addition, with less amount of carbon gamma (graphitic and destructive form) formed on the Rh-containing sample compared to the Rh-free Co/SBA-15 catalyst.
DOI: 10.1016/j.apcata.2016.04.014
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemical Engineering

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