Factors affecting the long-term stability of mesoporous nickel-based catalysts in combined steam and dry reforming of methane. Issue 12 (29th February 2016)

• Record Type: Journal Article
• Authors: Jabbour, K.; El Hassan, N.; Davidson, A.; Casale, S.; Massiani, P.
• Is Part Of: Catalysis science & technology. Volume 6:Issue 12(2016)
• Page Start: 4616
• Page End: 4631
• Publication Date: 2016-02-29
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c6cy00032k
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Direct "one-pot" synthesis is highly efficient to obtain performing mesoporous Ni–Al2 O3 catalysts able to resist deactivation by sintering and coke deposition during CH4 reforming by CO2 and H2 O to produce "metgas". Abstract : An ordered mesoporous "one-pot" nickel–alumina catalyst (5 wt% Ni) was synthesized using the evaporation-induced self-assembly method. Compared to an impregnated and a non-porous catalyst, the ordered "one-pot" Ni–alumina sample displayed, after in situ reduction, the highest and the most stable catalytic performances along a 40 h run at 800 °C in combined steam and dry reforming of methane, with conversion and selectivity values close to the thermodynamically expected ones. Both the confinement of well-dispersed Ni nanoparticles within the structured Al2 O3 framework and the strengthened Ni–support interaction compared to other catalysts are shown to be key factors accounting for the high catalytic activity and stability. In contrast to alumina that appears as an effective support of Ni for catalytic combined methane reforming, neither mesoporous (SBA-15) nor macroporous (CeliteS, diatoms) silica is appropriate due to rapid deactivation by partial reoxidation of the metallic Ni 0 active phase in the conditions of the reaction.