Low temperature dry reforming of methane on rhodium and cobalt based catalysts: Active phase stabilization by confinement in mesoporous SBA-15

Hassan, Nissrine El; Kaydouh, Marie-Nour; Geagea, H.; Zein, Hind El; Jabbour, Karam; Casale, Sandra; Zakhem, Henri El; Massiani, Pascale

doi:10.1016/j.apcata.2016.04.014

Cited by 120 publications

(46 citation statements)

References 61 publications

(79 reference statements)

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“…Stability measurements were performed at 650 °C, and kept at atmospheric pressure and at a gas hourly space velocity (GHSV) of 72 L.g −1 .h −1 . This protocol was chosen based on TPR data and on previous studies . Catalytic performances were established from the gas composition at the exit of the reactor monitored with an INFICON micro GC along with a TCD and two parallel channels (Molecular sieve and Plot U).…”

Section: Methodsmentioning

confidence: 99%

“…Recently, we showed that an efficient route to limit nickel sintering consists in using supports with high specific area and organized mesopores where the nickel nanoparticles can be occluded, leading not only to their stabilization against growing but also to their protection against carbon nanotube formation that is inhibited owing to steric constraints. [19][20][21][22] Enhancing the interaction between the nickel active phase and the support was also found to play a determining role, especially when using ordered mesoporous alumina with high specific surface as support. [23,24] Furthermore, increased interaction and performances were reached on this type of support by preparing the catalysts via a one-pot method consisting in introducing the nickel active phase directly during the synthesis of the alumina matrix instead of adding it by conventional post-synthesis impregnation treatment.…”

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Porous Nickel‐Alumina Derived from Metal‐Organic Framework (MIL‐53): A New Approach to Achieve Active and Stable Catalysts in Methane Dry Reforming

et al. 2019

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An Al‐containing MIL‐53 metal‐organic framework with very high surface area (SBET=1130 m2.g−1, N2 sorption) was used as sacrificial template to prepare a nickel‐alumina‐based catalyst (Ni0AlMIL) highly active and stable in the reaction of dry reforming of methane (DRM). The procedure consisted in impregnating the activated (solvent free) MIL‐53 sample with a nickel precursor solution, then calcining the material to remove the organic linkers and subsequently reducing it to form the reduced nickel active phase. At the step of calcination, this procedure results in the formation of a porous uniform spinel phase with Ni nanospecies embedded in the alumina‐based matrix, as deduced from XRD, TPR and TEM analyses. This leads after reduction to a porous lamellar γ‐Al2O3 material with small Ni0 nanoparticles homogeneously dispersed and stabilized within the support. The performances of this catalyst in DRM are better than those of two reference Ni/alumina catalysts prepared for comparison by conventional nickel impregnation of two preformed alumina supports: a first one obtained by calcination of MIL‐53 (AlMIL) and a second one consisting of a commercial γ‐Al2O3 batch (AlCOM). Under steady state conditions at a temperature of 650 °C and a pressure of 1 bar, the higher CH4 and CO2 conversions (till 3 times higher than on Ni0/AlCOM), high catalytic stability (no loss of activity after 13–100 h) and higher selectivity towards DRM (H2:CO products ratio remaining at 1) on Ni0AlMIL compared to the other catalysts is believed to come from the particularly strong interaction between the nickel and alumina phases generated by using the unique high specific surface of the parent MOF support to deposit nickel. This creates an intimate mixing favorable to a persisting interaction of the nickel nanoparticles with the alumina support in the reduced material. The lamellar shape of the γ‐Al2O3 composing the catalyst and its remaining high specific surface may also contribute to the excellent Ni resistance to sintering and in turn to the inhibition of carbon nanotubes formation during the reaction.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Porous Nickel‐Alumina Derived from Metal‐Organic Framework (MIL‐53): A New Approach to Achieve Active and Stable Catalysts in Methane Dry Reforming

et al. 2019

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“…[21] Moreover,t he re-oxidationo fm etallic Co in Co/TiO 2 (rutile) during DRM was found to be the main cause for low activity and deactivation. [23] Besides the Co/Al 2 O 3 and Co/TiO 2 catalysts, other Co-based catalysts, including bimetallic ones, [11a, 14, 24] Co(Mg-Al-O) derived from the layered double hydroxides, [25] Co/SBA-15, [26] Co/CeO 2 , [27] Co/Nd 2 O 3 , [28] andC o/C, [29] have been developed for DRM. [23] Besides the Co/Al 2 O 3 and Co/TiO 2 catalysts, other Co-based catalysts, including bimetallic ones, [11a, 14, 24] Co(Mg-Al-O) derived from the layered double hydroxides, [25] Co/SBA-15, [26] Co/CeO 2 , [27] Co/Nd 2 O 3 , [28] andC o/C, [29] have been developed for DRM.…”

Section: Introductionmentioning

confidence: 99%

How do Core–Shell Structure Features Impact on the Activity/Stability of the Co‐based Catalyst in Dry Reforming of Methane?

Pang

Zhong

et al. 2018

ChemCatChem

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Dry reforming of methane has been systematically investigated over a series of x‐Co@SiO2‐y catalysts where x is the Co particle size ranging from 11.1 to 121.3 nm while y denotes the silica shell thickness ranging from 6.0 to 21.9 nm. Various techniques including TEM, XRD, H2‐TPR/‐TPD, XPS, BET, O2‐TPO, TG, and H2‐TPSR‐MS were employed to characterize physicochemical properties of catalysts. H2‐TPR and XPS results indicate that the core–shell interaction is dependent on the core size: the smaller the Co particle size is; the stronger the core–shell interaction. The investigations employing H2‐TRSR‐MS and XPS on the spent catalysts demonstrated that a fraction of metallic Co was re‐oxidized on a large‐core catalyst such as 121.3‐Co@SiO2‐72.2 during the reaction, and such oxidation leads to lower catalytic activity and stability. O2‐TPO results indicated that the catalyst with smaller core size caused significant coking. TG analysis together with TEM investigation on the used samples suggested that carbon deposition is notably core‐size‐dependent and responsible for deactivation of the small‐core catalyst. Among various core–shell structured catalysts, 27.8‐Co@SiO2‐14.3 showed superior activity and durability, owing to the well‐balanced property between coking and anti‐oxidation of Co cores.

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“…Firstly, the consumption of CO 2 together with CH 4 allows the simultaneous valorization of these two greenhouse gases into molecules with higher added value. Secondly, the syngas obtained has an equimolar composition (H 2 :CO ratio of 1) that is the best suited for direct use in Fischer-Tropsch synthesis to produce hydrocarbons with high yield [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Nickel catalyst supported on magnesium and zinc aluminates (MgAl2O4 and ZnAl2O4) spinels for dry reforming of methane

et al. 2017

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Materials such as MgAl 2 O 4 and ZnAl 2 O 4 assessed in the reaction of dry reforming of methane to produce syngas were synthesized by microwave-assisted combustion method using urea as fuel. Samples of synthesized oxides were calcined at 800 °C for 2 h and impregnated with 5% nickel. The impregnated samples were calcined at 850 °C for 4 h to obtain the desired phases. The results of the catalytic tests showed that the catalysts are active for the reaction of dry reforming of methane, and the catalyst that showed the best performance for methane conversion was 5% Ni/MgAl 2 O 4 calcined at 850 °C/4 h. Keywords: chemical synthesis, powder diffraction, oxides, dry reform, nickel catalysts. Resumo Materiais

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Low temperature dry reforming of methane on rhodium and cobalt based catalysts: Active phase stabilization by confinement in mesoporous SBA-15

Cited by 120 publications

References 61 publications

Porous Nickel‐Alumina Derived from Metal‐Organic Framework (MIL‐53): A New Approach to Achieve Active and Stable Catalysts in Methane Dry Reforming

Porous Nickel‐Alumina Derived from Metal‐Organic Framework (MIL‐53): A New Approach to Achieve Active and Stable Catalysts in Methane Dry Reforming

How do Core–Shell Structure Features Impact on the Activity/Stability of the Co‐based Catalyst in Dry Reforming of Methane?

Nickel catalyst supported on magnesium and zinc aluminates (MgAl2O4 and ZnAl2O4) spinels for dry reforming of methane

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