Comparison of Ni and Ni–Ce/Al2O3 catalysts in granulated and structured forms: Their possible use in the oxidative dehydrogenation of ethane reaction

Bortolozzi, Juan Pablo; Weiß, Talitha; Gutierrez, Laura Beatriz; Ulla, Maria Alicia del H.

doi:10.1016/j.cej.2014.02.078

Cited by 62 publications

(37 citation statements)

References 46 publications

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“…This result might indicate that the reducibility of surface nickel oxide species displayed a decreasing trend during the change of the Ni/Ce ratio range from 0.2-2 and then went up at a Ni/Ce ratio of 5. The T3 reduction peak gradually shifted to higher temperature, probably due to the highly dispersed NiO or Ni-Ce solid solution produced on CeO 2 co-exist as reported by former researchers [35,36]. In terms of amorphous 2NiCe and 3DOM counterpart, the former presented a slightly greater H 2 uptake and lower reduction maximum temperature, implying that the NiCe sample could be easily reduced without 3DOM structure.…”

Section: Temperature-programmed Reductionmentioning

confidence: 64%

“…The T3 peak in the 440-490 • C temperature range might be identified as the high-temperature reduction peak of bulk NiO in the 3DOM framework as well as some strongly interacting nickel-cerium oxides. As for the 2NiCe sample, T1-T3 peaks corresponded to the reduction of surface active oxygen species adsorbed over oxygen vacancies, crystalline and Ni cations with a strong interaction with ceria, respectively [35].…”

Section: Temperature-programmed Reductionmentioning

confidence: 99%

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Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

et al. 2018

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Three-dimensionally ordered macroporous (3DOM) NiCe catalysts with different Ni/Ce molar ratio were fabricated using the colloidal crystal templating method. The physic-chemical properties of the samples were characterized by various techniques, including N 2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman, and H 2 -temperature-programmed reduction (TPR) characterizations. The results revealed that the 3DOM NiCe samples preserved the three-dimensionally ordered macroporous channels with interlinked micro-or mesoporous structure and highly dispersed nickel oxide species in the framework upon different amount of nickel incorporation. In the evaluation of the oxidative dehydrogenation (ODH) of propane, the 3DOM NiCe catalysts exhibited higher selectivity and yield to propene than the amorphous NiCe catalyst. An optimum yield of propene of 11.9% with the 30.3% propane conversion at 375 • C was obtained over the 3DOM 2NiCe catalyst. Combining XRD, TPR, and Raman analysis, it could be found that the nickel incorporation in CeO 2 lattice produced a high concentration of oxygen vacancies that were the active sites for the oxidative dehydrogenation of propane. Besides this, the 3DOM structure promoted the rapid diffusion of the reactants and products-favorable for the generation of propene in the ODH of propane.

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Section: Temperature-programmed Reductionmentioning

confidence: 64%

Section: Temperature-programmed Reductionmentioning

confidence: 99%

Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

et al. 2018

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“…[4][5][6][7] Currently, two catalytic systems are the most promising in the ODH of ethane, those based on Mo-V-Me-O oxides [8][9][10][11][12][13][14] and those based in nickel oxide. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] In the present work we will focus on catalysts based in nickel oxide. It is known that NiO alone can easily activate ethane with high activity.…”

Section: Introductionmentioning

confidence: 99%

“…15,19 However, if NiO is modified by either using appropriate metal oxides as supports or, especially, using suitable promoters added in the preparation procedure the production of ethylene can be largely enhanced. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] The use of catalytic supports is usually highly beneficial because it favors the dispersion of the active phase, enhancing the number of available active centers, and also, in most cases, modifies the nature of the active sites. NiO based catalysts have been tested in ODH reaction using several supports such as MgO, 17 CeO2, 20 zeolite 24,25 and mainly Al2O3; [26][27][28] better catalytic performance in terms of activity and especially selectivity to 4 olefin have been reported in supported NiO catalysts than in bulk NiO.…”

Section: Introductionmentioning

confidence: 99%

Nickel oxide supported on porous clay heterostructures as selective catalysts for the oxidative dehydrogenation of ethane

Solsona

Concepción

Nieto

et al. 2016

Catal. Sci. Technol.

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Porous Clay Heteroestructures (PCH) have shown to be highly efficient supports for nickel oxide in the oxidative dehydrogenation of ethane. Thus NiO supported on silica with PCH structure shows productivity towards ethylene three times higher than if NiO is supported on a conventional silica. This enhanced productivity is due to an increase in the catalytic activity and especially to a drastic increase in the selectivity to ethylene.Additionally, PCH silica modified with columns of TiO2 have also been synthesized and used as supports for NiO. An enhanced activity and selectivity to ethylene was found compared to the TiO2-free PCH. The enhanced catalytic performance has been related to the high dispersion of nickel oxide particles on the support, which leads to a lower reducibility of the nickel oxide, hindering the oxidation of ethane into carbon oxides.More interestingly, the particle morphology plays an important role on the catalyst selectivity since a higher distortion of the NiO crystal lattice parameter has meant an enhanced selectivity to ethylene.

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“…Some of them offer lower pressure drop, higher energy efficiency, allow detailed designs, and ease scaling-up, among others [20,21]. The substrates that have been studied for the preparation of structured catalysts are ceramic foams [22], ceramic monoliths [23][24][25], ceramic papers [26][27][28], metallic foams [22,29], and metallic monoliths [5,30].…”

Section: Introductionmentioning

confidence: 99%

FeCrAlloy Monoliths Coated with Ni/Al2O3 Applied to the Low-Temperature Production of Ethylene

et al. 2018

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This paper investigates the oxidative dehydrogenation of ethane to produce ethylene at low temperatures (500 • C) in metallic structured substrates. To check this point, the FeCrAlloy ® monoliths with different channel sizes (289-2360 cpsi) were prepared. The monoliths were coated with a Ni/Al 2 O 3 catalyst (by washcoating of alumina and the latter nickel impregnation) and characterized by Scanning Electron Microscopy and Energy-Dispersive X-ray analysis (SEM-EDX), Temperature-Programmed Reduction (TPR), X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS). The catalytic results showed that all monoliths coated with~300 mg of catalyst presented similar ethane conversion (15%) at 450 • C. However, the lowest selectivity to ethylene was found for the monolith with the lower channel size and the higher geometric surface area, where a heterogeneous catalyst layer with Ni enriched islands was generated. Therefore, it can be said that the selectivity to ethylene is linked to the distribution of Ni species on the support (alumina). Nevertheless, in all cases the selectivity was high (above 70%). On the other hand, the stability in reaction tests of one of the coated monoliths was done. This structured catalyst proved to be more stable under reaction conditions than the powder catalyst, with an initial slight drop in the first 8 h but after that, constant activity for the 152 h left.

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Comparison of Ni and Ni–Ce/Al2O3 catalysts in granulated and structured forms: Their possible use in the oxidative dehydrogenation of ethane reaction

Cited by 62 publications

References 46 publications

Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

Nickel oxide supported on porous clay heterostructures as selective catalysts for the oxidative dehydrogenation of ethane

FeCrAlloy Monoliths Coated with Ni/Al2O3 Applied to the Low-Temperature Production of Ethylene

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