Kinetic insights into the effect of promoters on Co/Al2O3 for Fischer-Tropsch synthesis

Yang, Xiaoli; Yang, Jia; Zhao, Tao; Qian, Weixin; Wang, Yalan; Holmén, Anders; Jiang, Wei; Chen, De; Ben, Haoxi

doi:10.1016/j.cej.2022.136655

Cited by 17 publications

(5 citation statements)

References 58 publications

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“…Moreover, linear relationships were observed between E a and Δ S 0 * for CO 2 conversion and product formation over these catalysts (Figure d–f). This kind of compensation effect verified that the catalytic activity was not only determined by the adsorption configuration on copper surfaces but also affected by the electronic structure of Cu species. , …”

Section: Resultssupporting

confidence: 59%

“…This kind of compensation effect verified that the catalytic activity was not only determined by the adsorption configuration on copper surfaces but also affected by the electronic structure of Cu species. 47,48 CO 2 -TPD was conducted to study the adsorption properties of CO 2 . The curves in Figure S10 showed that only one peak occurred over 0.5% Cu/L and 1% Cu/L, which indicated weak adsorption at OH − sites.…”

Section: Kinetic Insights and Reactionmentioning

confidence: 99%

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Tailoring Zeolite L-Supported-Cu Catalysts for CO₂ Hydrogenation: Insights into the Mechanism of CH₃OH and CO Formation

et al. 2023

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The utilization of Cu-based catalysts in CO 2 conversion into valuable chemicals is of significant interest due to their potential in mitigating greenhouse gas emissions. However, the controllable design of Cu-based catalysts and the regulation of their mechanism remain challenging. In this study, a series of efficient Cu/L catalysts were prepared for this process, and the intrinsic influencing factors on the reaction routes were systematically revealed. Various techniques revealed that Cu particles in Lsupported catalysts exhibited higher dispersion and formed Cu− O(OH)−K interfacial sites. However, with increasing Cu loading, the dispersion of Cu particles and the percentage of Cu−O(OH)− K interfaces decreased. Kinetic investigations revealed that the adsorption configuration and electronic structure of Cu species codetermined the reaction pathways and resulting selectivity. Cu/L catalysts possessing Cu−O(OH)−K interfaces and small particles demonstrated the preferential formation of formate species, promoting methanol formation. However, larger Cu particles generated carboxylate intermediates, resulting in higher CO selectivity..

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Section: Resultssupporting

confidence: 59%

Section: Kinetic Insights and Reactionmentioning

confidence: 99%

Tailoring Zeolite L-Supported-Cu Catalysts for CO₂ Hydrogenation: Insights into the Mechanism of CH₃OH and CO Formation

et al. 2023

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“…This kinetical study reveals that Ir-and Rh-promoted catalysts have larger numbers of active sites, but the Sb-and Ga-promoted catalysts have fewer active sites, which is consistent with the dispersion data. In addition, the quantities of CH x intermediates showed a similar trend with that of surface CO over these catalysts [83]. Shortly after, Pedersen and co-workers considered Mn-promoted Co catalysts for CO hydrogenation [30].…”

Section: Cobalt-promoted Catalystsmentioning

confidence: 72%

A Review of Theoretical Studies on Carbon Monoxide Hydrogenation via Fischer–Tropsch Synthesis over Transition Metals

Jamaati,

Torkashvand,

Sarabadani Tafreshi

et al. 2023

Molecules

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The increasing demand for clean fuels and sustainable products has attracted much interest in the development of active and selective catalysts for CO conversion to desirable products. This review maps the theoretical progress of the different facets of most commercial catalysts, including Co, Fe, Ni, Rh, and Ru. All relevant elementary steps involving CO dissociation and hydrogenation and their dependence on surface structure, surface coverage, temperature, and pressure are considered. The dominant Fischer–Tropsch synthesis mechanism is also explored, including the sensitivity to the structure of H-assisted CO dissociation and direct CO dissociation. Low-coordinated step sites are shown to enhance catalytic activity and suppress methane formation. The hydrogen adsorption and CO dissociation mechanisms are highly dependent on the surface coverage, in which hydrogen adsorption increases, and the CO insertion mechanism becomes more favorable at high coverages. It is revealed that the chain-growth probability and product selectivity are affected by the type of catalyst and its structure as well as the applied temperature and pressure.

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“…The peak at 678 °C was due to CoOx-Al2O3 or CoAlxOy. Owing to the similar crystal structures of Co3O4 and γ-Al2O3, it was likely to have ion migration from cobalt oxide into the Al2O3 support [45,46] (Figure 3a). For bimetallic catalysts with different Co/Ni ratios, the reduction peaks gradually shifted to lower temperatures with increasing Ni content, suggesting interaction between cobalt-nickel oxides.…”

Section: Resultsmentioning

confidence: 99%

Ion-Exchange Synthesis of Surrounded CoNi@Al2O3 Catalyst for Levulinic Acid Hydrogenation to γ-Valerolactone under Mild Conditions

Ding,

Yang,

Jiang

et al. 2024

Catalysts

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The use of eco-friendly biomass as a resource is an efficient way to address the problems of fossil fuel depletion and climate change. In biomass conversion, versatile γ-valerolactone (GVL) is generally obtained from levulinic acid (LA) hydrogenation via a multimetallic catalyst system. Despite conversion efficiency being enhanced in mild conditions due to metal interactions, maintaining high catalyst stability is still a challenge. In this study, we synthesized a surrounded Co0.52Ni0.48@Al2O3-IE catalyst that exhibited excellent alloying and synergistic interaction between the metal constituents. Under relatively mild reaction conditions, the GVL yield over the catalyst exceeded 99% in LA hydrogenation. The catalyst showed no deactivation in a test of five cycles, displaying superiority in stability, possibly due to reasons of the physical isolation of the shell and the alumina retention on the Co-Ni alloys surface caused by the reversibility of exchange equilibrium. The present work demonstrated that a surrounded structured catalyst fabricated by ion exchange (IE) with active metals physically enclosed can lead to high catalytic activity and superior stability.

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Kinetic insights into the effect of promoters on Co/Al2O3 for Fischer-Tropsch synthesis

Cited by 17 publications

References 58 publications

Tailoring Zeolite L-Supported-Cu Catalysts for CO₂ Hydrogenation: Insights into the Mechanism of CH₃OH and CO Formation

Tailoring Zeolite L-Supported-Cu Catalysts for CO₂ Hydrogenation: Insights into the Mechanism of CH₃OH and CO Formation

A Review of Theoretical Studies on Carbon Monoxide Hydrogenation via Fischer–Tropsch Synthesis over Transition Metals

Ion-Exchange Synthesis of Surrounded CoNi@Al2O3 Catalyst for Levulinic Acid Hydrogenation to γ-Valerolactone under Mild Conditions

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Kinetic insights into the effect of promoters on Co/Al2O3 for Fischer-Tropsch synthesis

Cited by 17 publications

References 58 publications

Tailoring Zeolite L-Supported-Cu Catalysts for CO2 Hydrogenation: Insights into the Mechanism of CH3OH and CO Formation

Tailoring Zeolite L-Supported-Cu Catalysts for CO2 Hydrogenation: Insights into the Mechanism of CH3OH and CO Formation

A Review of Theoretical Studies on Carbon Monoxide Hydrogenation via Fischer–Tropsch Synthesis over Transition Metals

Ion-Exchange Synthesis of Surrounded CoNi@Al2O3 Catalyst for Levulinic Acid Hydrogenation to γ-Valerolactone under Mild Conditions

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Product

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Tailoring Zeolite L-Supported-Cu Catalysts for CO₂ Hydrogenation: Insights into the Mechanism of CH₃OH and CO Formation

Tailoring Zeolite L-Supported-Cu Catalysts for CO₂ Hydrogenation: Insights into the Mechanism of CH₃OH and CO Formation