Promoted NiO Catalysts for the Oxidative Dehydrogenation of Ethane

Nieto, J.M. López; Solsona, Benjamín; Grasselli, Robert K.; Concepción, Patricia

doi:10.1007/s11244-014-0288-2

Cited by 48 publications

(26 citation statements)

References 33 publications

(57 reference statements)

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“…41 which has been reported as non-selective, 22 with practically no participation of lattice oxygen species.…”

Section: Catalyst Characterizationmentioning

confidence: 95%

“…The role of the acidic sites in the ODH of ethane has been described to be related to the ease for the ethylene desorption thus decreasing the ethylene overoxidation. However, in a recent paper these conclusions about the ethylene desorption were questioned 19,22 although the positive role of the acid sites was also observed. Thus, pillared clays with Si/Ti pillars were used as supports for nickel oxide.…”

Section: Ethane Odhmentioning

confidence: 98%

“…In this way, it has been recently suggested that small NiO crystallites tend to produce more ethylene than large NiO crystallites, which is favored by using metal oxides support with acid characteristics. 22 Clay minerals are versatile materials with a wide range of applications and low cost, among them, these materials have been used as catalysts and catalytic supports. The applications of the clay minerals can be influenced by the physicochemical properties of them.…”

Section: Introductionmentioning

confidence: 99%

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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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“…41 which has been reported as non-selective, 22 with practically no participation of lattice oxygen species.…”

Section: Catalyst Characterizationmentioning

confidence: 95%

Section: Ethane Odhmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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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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“…15% points), raising for instance from 70% to 85% at low conversion ( Figure 6). López Nieto et al had also observed this behavior for two different Ce/Zr ratios in bulk catalysts [43]. consumed and the active sites are reduced to allow the formation of products.…”

Section: Catalytic Performance In Odhe: Powder and Monolithic Catalystsmentioning

confidence: 71%

Novel Ni-Ce-Zr/Al2O3 Cellular Structure for the Oxidative Dehydrogenation of Ethane

et al. 2017

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A novel γ-alumina-supported Ni-Ce-Zr catalyst with cellular structure was developed for oxidative dehydrogenation of ethane (ODHE). First, powdered samples were synthesized to study the effect of both the total metal content and the Ce/Zr ratio on the physicochemical properties and performance of these catalysts. All synthesized powdered samples were highly active and selective for ODHE with a maximum ethylene productivity of 6.94 µmol ethylene g act cat −1 s −1 . According to the results, cerium addition increased the most reducible nickel species population, which would benefit ethane conversion, whereas zirconium incorporation would enhance ethylene selectivity through the generation of higher amounts of the least reducible nickel species. Therefore, the modification of active site properties by addition of both promoters synergistically increases the productivity of the Ni-based catalysts. The most efficient formulation, in terms of ethylene productivity per active phase amount, contained 15 wt% of the mixed oxide with Ni 0.85 Ce 0.075 Zr 0.075 composition. This formulation was selected to synthesize a Ni-Ce-Zr/Al 2 O 3 structured body by deposition of the active phase onto a homemade γ-alumina monolith. The structured support was manufactured by extrusion of boehmite-containing dough. The main properties of the Ni 0.85 Ce 0.075 Zr 0.075 powder were successfully preserved after the shaping procedure. In addition, the catalytic performance of the monolithic sample was comparable in terms of ethylene productivity to that of the powdered counterpart.

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“…This parameter is key for an industrial application and it can be increased if the nickel oxide is dispersed in a high surface material as Al2O3 [11,12], TiO2 [13], MgO [14], ZrO2 [15], or clay [16]. Another route to improve the selectivity is to modify nickel oxide with high valence cations [17][18][19], but the deposition of these catalytic systems on a structured substrate is quite complex.…”

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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Promoted NiO Catalysts for the Oxidative Dehydrogenation of Ethane

Cited by 48 publications

References 33 publications

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

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

Novel Ni-Ce-Zr/Al2O3 Cellular Structure for the Oxidative Dehydrogenation of Ethane

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

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