Influence of calcination temperature on textural and structural properties, reducibility, and catalytic behavior of mesoporous γ-alumina-supported Ni–Mg oxides by one-pot template-free route

a b s t r a c tSorption enhanced CO 2 methanation is a complex process in which the key challenge lies in the combined optimization of the catalyst activity and water adsorption properties of the zeolite support. In the present work, improved nickel-based catalysts with an enhanced water uptake capacity were designed and catalytically investigated. Two different zeolite frameworks were considered as supports for nanostructured Ni, and studied with defined operation parameters. 5Ni/13X shows significantly increased, nearly three-fold higher, operation time in the sorption enhanced CO 2 methanation mode compared to the reference 5Ni/5A, likely due to its higher water sorption capacity. Both catalysts yield comparable CO 2 conversion in conventional CO 2 methanation (without water uptake). Regeneration of the catalysts performance is possible via a drying step between methanation cycles under both reducing and oxidizing atmospheres; however, operation time of 5Ni/13X increases further after drying under air.

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“…Ref. [20]). That the effect of reducing the catalyst at 500 C is twice more pronounced for 5Ni/5A can be explained by the TPR data of Fig.…”

Section: Resultsmentioning

confidence: 99%

Development of improved nickel catalysts for sorption enhanced CO2 methanation

Delmelle

Duarte

Franken

et al. 2016

International Journal of Hydrogen Energy

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“…[8] It has been demonstrated that small Ni crystallites can reduce the rate of carbon deposition, and this resultsi nb etter catalytic stability for the reforming of hydrocarbons. [9][10][11][12] The preparation of stable nanosized Ni crystallites has been the key for developinge xcellent Ni catalysts. The so-called "solid-phase crystallization" method has recently attracteds peciali nterest as ap romising route to obtain good catalysts based on small metal particles dispersed on as upport.…”

mentioning

confidence: 99%

Perovskite LaNiO₃ Nanocrystals inside SBA‐15 Silica: High Stability and Anti‐Coking Performance in the Pre‐Reforming of Liquefied Petroleum Gas at a Low Steam‐to‐Carbon Molar Ratio

Wang

Tan

et al. 2016

ChemCatChem

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Ah igh loading of LaNiO 3 perovskite nanocrystals (83 wt %) was successfully incorporated inside the orderedm esoporous framework of SBA-15s ilica by ac itric acid assisted impregnation method.T he obtained LaNiO 3 /SBA-15 material produced both La 2 O 3 nanoparticles andm etal Ni nanoparticles with intimate contact and highly dispersed in the mesoporousS BA-15 framework upon reduction with H 2 ,a nd it showed high activity,h igh stability,a nd good anti-coking ability for the low-temperatures team reforming of liquefied petroleumg as at al ow steam/carbon ratio of 1.0. The excellent performance of the LaNiO 3 /SBA-15 materialw as attributed to the formationo fs ynergistic active sites in the interfacial area, which consisted of metal Ni andL a 2 O 2 CO 3 species, and the confinement effect of the mesoporous structure on the Ni and La 2 O 3 species.Nickel-based catalysts have been widely investigated for the production of synthesis gas and hydrogen through various reforming processes of hydrocarbons because of their high intrinsic catalytic activity and low cost.[1-4] However,t raditionalN i catalysts suffer from severe deactivation resulting from coke deposition and sintering of the Ni particles and support. [5][6][7] Therefore, it remains an important challenge to develop novel Ni-based catalysts with improved stability to suppress coke deposition and thermalsintering. [8] It has been demonstrated that small Ni crystallites can reduce the rate of carbon deposition, and this resultsi nb etter catalytic stability for the reforming of hydrocarbons. [9][10][11][12] The preparation of stable nanosized Ni crystallites has been the key for developinge xcellent Ni catalysts. The so-called "solid-phase crystallization" method has recently attracteds peciali nterest as ap romising route to obtain good catalysts based on small metal particles dispersed on as upport. [13,14] Using this method, supported Ni nanocrystallites are obtained by in situ reduction of homogeneously distributed Ni ions in mineral-type crystalline solids, such as LaNiO 3 perovskites, [15] NiAl 2 O 4 spinels, [16] and Ni-Mg-O solids olutions.[17] The sintering of Ni crystallites can be efficiently suppressed by the presenceo fstrong metal-support interactions. Nevertheless, these supported Ni-based catalysts are frequently insufficient to meet the demands of the reaction because of low surfacea reas, which precludes dispersion of the active metals.S ome efforts have been devoted to introducing mineral-type nanocrystalsi nt he support with welldefined channels, as this offers not only ah igh surface area for the dispersion of active metals but also as patialr estriction on metal crystallites that hamper sintering.[18] However,t he controllable preparation of mineral-typen anocrystals in the support with an appropriate porous structure such as SBA-15s ilica remains challenging.Liquefied petroleum gas (LPG) is considered ap referred fuel for distributed hydrogen production for fuel-cella pplications owing to its easy storagea nd transportation and well...

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“…Table. 1 shows the BET surface areas. From the results, It can be seen that all catalysts presented type IV isotherms with a H1-type hysteresis loop and these were typical mesoporous materials [8,15]. The 10Ni/MA-c owned largest BET surface area, pore volume and average pore diameter.…”

Section: Cog Dry Reformingmentioning

confidence: 92%

Effect of Preparation Method on the Performance of 10Ni/MgAl2O4 for Dry Reforming of Coke Oven Gas

Wu¹,

Cheng²,

Wang³

et al. 2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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Abstract. MgAl 2 O 4 spinel, as support of the 10Ni/MgAl 2 O 4 catalyst which used for coke oven gas dry reforming, was prepared by sol-gel, coprecipitation and urea hydrolysis method. The catalysts were prepared by impregnation. The MgAl 2 O 4 and 10Ni/MgAl 2 O 4 were both calcined at 800 o C for 5 h and the samples were characterized by BET, XRD, TG-DSC techniques. The MgAl 2 O 4 prepared by coprecipitation showed higher performance in comparison with other two methods which performed high conversion of reactant gas and selectivity of syngas at 700 o C for 24 h.

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Influence of calcination temperature on textural and structural properties, reducibility, and catalytic behavior of mesoporous γ-alumina-supported Ni–Mg oxides by one-pot template-free route

Cited by 67 publications

References 60 publications

Development of improved nickel catalysts for sorption enhanced CO2 methanation

Development of improved nickel catalysts for sorption enhanced CO2 methanation

Perovskite LaNiO₃ Nanocrystals inside SBA‐15 Silica: High Stability and Anti‐Coking Performance in the Pre‐Reforming of Liquefied Petroleum Gas at a Low Steam‐to‐Carbon Molar Ratio

Effect of Preparation Method on the Performance of 10Ni/MgAl2O4 for Dry Reforming of Coke Oven Gas

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Influence of calcination temperature on textural and structural properties, reducibility, and catalytic behavior of mesoporous γ-alumina-supported Ni–Mg oxides by one-pot template-free route

Cited by 67 publications

References 60 publications

Development of improved nickel catalysts for sorption enhanced CO2 methanation

Development of improved nickel catalysts for sorption enhanced CO2 methanation

Perovskite LaNiO3 Nanocrystals inside SBA‐15 Silica: High Stability and Anti‐Coking Performance in the Pre‐Reforming of Liquefied Petroleum Gas at a Low Steam‐to‐Carbon Molar Ratio

Effect of Preparation Method on the Performance of 10Ni/MgAl2O4 for Dry Reforming of Coke Oven Gas

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Perovskite LaNiO₃ Nanocrystals inside SBA‐15 Silica: High Stability and Anti‐Coking Performance in the Pre‐Reforming of Liquefied Petroleum Gas at a Low Steam‐to‐Carbon Molar Ratio