Mixed oxide Ti Si O prepared by non-hydrolytic Xerogel method as a diluter of nickel oxide for the oxidative dehydrogenation of ethane

Ykrelef, A.; Nadji, L.; Issaadi, Rachid; Agouram, Saïd; Rodríguez‐Castellón, Enrique; Solsona, Benjamín; Nieto, J.M. López

doi:10.1016/j.cattod.2017.03.021

Cited by 11 publications

(7 citation statements)

References 49 publications

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“…Besides, the performance of the powder sample is only slightly better than that of the monolithic counterpart Ni0.85Ce0.075Zr0.075-15 M. [14,20,44]. [14,20,44].…”

Section: Catalytic Performance In Odhe: Powder and Monolithic Catalystsmentioning

confidence: 86%

“…This value takes into account the ethane conversion as well as the selectivity to ethylene. In Figure 8 the productivity of the powdered and monolithic samples with the optimized composition, 6.94 and 6.25 µmol ethylene /g act cat s, respectively, referred to the weight of active phase, is compared with very recent literature values for ODHE catalysts [14,20,44] In this vein, ethylene productivity was calculated to assess the global performance of the prepared catalysts. This value takes into account the ethane conversion as well as the selectivity to ethylene.…”

Section: Catalytic Performance In Odhe: Powder and Monolithic Catalystsmentioning

confidence: 99%

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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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“…Besides, the performance of the powder sample is only slightly better than that of the monolithic counterpart Ni0.85Ce0.075Zr0.075-15 M. [14,20,44]. [14,20,44].…”

Section: Catalytic Performance In Odhe: Powder and Monolithic Catalystsmentioning

confidence: 86%

Section: Catalytic Performance In Odhe: Powder and Monolithic Catalystsmentioning

confidence: 99%

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

et al. 2017

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“…[17,23] Interestingly, the improved catalytic performance has been obtained over metal-modified NiO catalysts. [20,[24][25][26][27][28][29] However, the effect of metal promoters on pure NiO is still under investigation.…”

Section: Introductionmentioning

confidence: 99%

“…In the early years, the effect of oxidation number of doped metals on the catalytic performance of NiO alone was studied by Heracleous and Lemonidou. [30] When Al 3 + , [8,31] Ti 4 + , [26] Nb 5 + [20,29] and Ta 5 + [27] with high valence as electron donors were incorporated into NiO to form NiÀ M solid solution, the cation holes could be reduced, thus decreasing the number and lability of electrophilic O À species. However, by introducing Li + or Mg 2 + ions, the opposite results were observed.…”

Section: Introductionmentioning

confidence: 99%

“…Bulk NiO exhibited a high activation rate of ethane and a low selectivity of ethylene thanks to the presence of abundant non‐selective oxygen species derived from the cation vacancies [17,23] . Interestingly, the improved catalytic performance has been obtained over metal‐modified NiO catalysts [20,24–29] . However, the effect of metal promoters on pure NiO is still under investigation.…”

Section: Introductionmentioning

confidence: 99%

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Porous Ni−Al−O Fabricated by a Facile Hydrothermal Method: Improved Catalytic Performance for the Oxidative Dehydrogenation of Ethane to Produce Ethylene

et al. 2022

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The oxidative dehydrogenation of ethane (ODHE) to ethylene is a process with many advantages (such as energy conservation and coke resistance). Herein, flower‐like Ni−Al−O catalysts with hierarchical structure and high surface areas were fabricated through a hydrothermal route and were applied to ODHE using O2 as oxidant. Compared with NiO alone, the Al3+ insertion into NiO matrix not only increases the C2H4 selectivity by 3–4 times, but also prevents the generation of CO2 and CH4 above 500 °C. At 550 °C, all Ni−Al−O catalysts maintain approximately 50 % ethylene selectivity regardless of Al content. The ethylene yield of 29.5 % with C2H4 selectivity 55.7 % over Ni−Al0.8‐O sample can be reached at 500 °C. Moreover, the Ni−Al0.8‐O catalyst presents a good stability and has no loss of activity after 100 h continuous evaluation. The various characterizations were carried out for investigating the nature of as‐prepared Ni−Al−O catalysts with different Al loadings. Experimental results demonstrate that the addition of Al not only affects the structure and texture properties of NiO, but also impacts the reducibility of Ni species and the amount of active oxygen species. It is found that the Al3+ substitution results in: (1) smaller NiO size; (2) larger specific surface area; (3) weaker reducibility and (4) fewer non‐stoichiometric oxygen species. Therefore, the significant improvement of ethylene selectivity is observed in Ni−Alx‐O catalysts.

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Catalysts based on Ni-Fe oxides supported on γ-Al2O3 for the oxidative dehydrogenation of ethane

et al. 2020

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Mixed oxide Ti Si O prepared by non-hydrolytic Xerogel method as a diluter of nickel oxide for the oxidative dehydrogenation of ethane

Cited by 11 publications

References 49 publications

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

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

Porous Ni−Al−O Fabricated by a Facile Hydrothermal Method: Improved Catalytic Performance for the Oxidative Dehydrogenation of Ethane to Produce Ethylene

Catalysts based on Ni-Fe oxides supported on γ-Al2O3 for the oxidative dehydrogenation of ethane

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