Promoting effect of CeO2, ZrO2 and Ce/Zr mixed oxides on Co/γ-Al2O3 catalyst for Fischer-Tropsch synthesis

Garcilaso, Victoria; Barrientos, Javier; Bobadilla, Luis F.; Laguna, Óscar H.; Boutonnet, Magali; Centeno, M.A.; Odriozola, J.A.

doi:10.1016/j.renene.2018.08.080

Cited by 25 publications

(16 citation statements)

References 56 publications

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“…As is known, the surface chemical states of the catalysts played a vital part in catalytic oxidation. , The information of Ce and Co ions at the surface was investigated by XPS. It was noted that the CeO 2 @Co 3 O 4 sample had relatively higher surface Co 3+ /Co 2+ and Ce 3+ /Ce 4+ ratios (Table ).…”

Section: Discussionmentioning

confidence: 99%

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Fang

Chen

Zhou

et al. 2020

Ind. Eng. Chem. Res.

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In this work, a core–shell structured CeO2@Co3O4 catalyst was successfully prepared by using a zeolitic imidazolate framework-based material as a sacrificial template. The structure, morphology, and physicochemical characteristics of these materials were investigated by X-ray diffraction, N2 sorption, Fourier transform infrared spectroscopy, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and temperature-programmed reduction studies. Compared with pure Co3O4 and CeO2, the CeO2@Co3O4 sample displayed superior catalytic performance (T 90 = 225 °C) toward toluene oxidation. Results demonstrated that the CeO2@Co3O4 sample exhibited a core–shell structure, with hierarchically wrinkled surfaces. This unique structure, especially the interface between the core and the shell, endowed the CeO2@Co3O4 catalyst with better activity. In addition, there was a synergistic effect between cerium and cobalt oxides in the core–shell bimetallic sample, which was responsible for the improved performance of the material. Moreover, surface-active oxygen species involved and played a significant role in toluene oxidation.

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Section: Discussionmentioning

confidence: 99%

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Fang

Chen

Zhou

et al. 2020

Ind. Eng. Chem. Res.

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“…[10][11][12] Meanwhile, additions of promoters also modify catalyst activity and impress the product distribution. [13][14][15][16][17] Among FTS products, olefins and C5 + hydrocarbons are widely considered due to their applications. [18,19] Therefore, the promoter's selection is essential for achieving this goal.…”

Section: Introductionmentioning

confidence: 99%

“…The type of catalyst can affect product distribution; for instance, cobalt‐based catalysts prefer to produce heavy waxy products [10–12] . Meanwhile, additions of promoters also modify catalyst activity and impress the product distribution [13–17] …”

Section: Introductionmentioning

confidence: 99%

Production of light olefins and C₅⁺ hydrocarbons in the Fischer‐Tropsch synthesis by using inorganic precursor

et al. 2022

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The role of the synthetic route in Fischer-Tropsch synthesis (FTS) over the BaÀ Co-Mn catalysts was investigated in the fixed bed micro reactor. Synthesis of catalysts through inorganic complex [Ba 0.5 Co 0.34 Mn 0.66 (btc) 2 (H 2 O) 5 ] (1) led to enhancement of the surface area and decreased particle sizes. Therefore, the catalytic activity of catalysts prepared this way was improved as well as their olefins and C 5 + selectivity. The synthesised catalysts prepared by inorganic precursor had higher selectivity to heavier hydrocarbons at high pressure in comparison to lower pressure.

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“…Consequently, the reaction conditions play an important role in FT selectivity. Indeed, an increase toward C 5+ yield and lower C 1 production has been observed operating at lower temperatures and high hydrogen pressures. − It is also possible to produce methane by the Sabatier reaction, better known as the methanation (M) reaction (eq ), which is slightly more exothermic than the FTS reaction. The exothermicity of both reactions (FT and M) could lead to hotspots in the reaction systems, causing deactivation and sintering. Therefore, refractory oxides with high thermal stability, in which the active metals can be amply dispersed, are typically required …”

Section: Introductionmentioning

confidence: 99%

Enhanced CO₂ Hydrogenation to C₂₊ Hydrocarbons over Mesoporous x%Fe₂O₃–Al₂O₃ Catalysts

Rosa-Priego

Gutierrez-López

Zepeda

et al. 2021

Ind. Eng. Chem. Res.

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This work describes the preparation of mesoporous binary x%Fe2O3–Al2O3 mixed oxides with varying Fe2O3 nominal loading (x = 5, 10, and 20 wt %) by a one-step soft template sol–gel process. The binary oxides were used as catalysts in CO2 hydrogenation to produce C2+ hydrocarbons. The catalytic test was conducted at 280, 300, and 320 °C at a pressure of 20 bar, under a gas mixture of H2 and CO2 with a molar ratio H2/CO2 = 3. The main reaction products were methane, CO, C2- C4 olefins, and traces of C5+ compounds depending on the Fe2O3 nominal content. The catalyst modified with 20 wt % Fe2O3 displayed the best catalytic performance in terms of C2+ hydrocarbons production. An increase in the Fe2O3 nominal content from 5 to 20% induces a significant decrease in the reverse water gas shift (RWGS) reaction because of a 5-fold higher surface exposure of the Fe0 species. The TPR and FTIR results of adsorbed CO confirmed an easier reduction of Fe2O3 species and a decrease in the metallic-support interaction, as Fe2O3 content of the composite catalyst increased. A linear correlation was found between the surface exposure of the Fe0 species and the yield of C2+ hydrocarbons. Minimal coke deposition was detected after reaction tests.

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Promoting effect of CeO2, ZrO2 and Ce/Zr mixed oxides on Co/γ-Al2O3 catalyst for Fischer-Tropsch synthesis

Cited by 25 publications

References 56 publications

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Production of light olefins and C₅⁺ hydrocarbons in the Fischer‐Tropsch synthesis by using inorganic precursor

Enhanced CO₂ Hydrogenation to C₂₊ Hydrocarbons over Mesoporous x%Fe₂O₃–Al₂O₃ Catalysts

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Promoting effect of CeO2, ZrO2 and Ce/Zr mixed oxides on Co/γ-Al2O3 catalyst for Fischer-Tropsch synthesis

Cited by 25 publications

References 56 publications

Zeolitic Imidazolate Framework-67-Derived CeO2@Co3O4 Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Zeolitic Imidazolate Framework-67-Derived CeO2@Co3O4 Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Production of light olefins and C5+ hydrocarbons in the Fischer‐Tropsch synthesis by using inorganic precursor

Enhanced CO2 Hydrogenation to C2+ Hydrocarbons over Mesoporous x%Fe2O3–Al2O3 Catalysts

Contact Info

Product

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Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Production of light olefins and C₅⁺ hydrocarbons in the Fischer‐Tropsch synthesis by using inorganic precursor

Enhanced CO₂ Hydrogenation to C₂₊ Hydrocarbons over Mesoporous x%Fe₂O₃–Al₂O₃ Catalysts