A new LHHW kinetic model for CO2 hydrogenation over an iron catalyst

Pour, Ali Nakhaei; Housaindokht, Mohammad Reza; Monhemi, Hassan

doi:10.3184/146867816x14628763021337

Cited by 12 publications

(3 citation statements)

References 40 publications

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“…The FTS reaction is the rate-limiting step due to the much lower reaction rate. The FTS reaction during the CO 2 hydrogenation process is limited by the reaction between the adsorbed CO and H 2 to form *HCO intermediates, as reported by Pour et al 103 after evaluating different kinetic models and applying a genetic algorithm (GA) approach and the Levenberg–Marquardt (LM) method. Thus, efficient active sites for the FTS reaction are important for the whole CO 2 hydrogenation process.…”

Section: Fischer–tropsch Synthesis (Fts)-based Co2 Hydrogenationmentioning

confidence: 99%

CO2 hydrogenation to high-value products via heterogeneous catalysis

et al. 2019

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Recently, carbon dioxide capture and conversion, along with hydrogen from renewable resources, provide an alternative approach to synthesis of useful fuels and chemicals. People are increasingly interested in developing innovative carbon dioxide hydrogenation catalysts, and the pace of progress in this area is accelerating. Accordingly, this perspective presents current state of the art and outlook in synthesis of light olefins, dimethyl ether, liquid fuels, and alcohols through two leading hydrogenation mechanisms: methanol reaction and Fischer-Tropsch based carbon dioxide hydrogenation. The future research directions for developing new heterogeneous catalysts with transformational technologies, including 3D printing and artificial intelligence, are provided.

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Section: Fischer–tropsch Synthesis (Fts)-based Co2 Hydrogenationmentioning

confidence: 99%

CO2 hydrogenation to high-value products via heterogeneous catalysis

et al. 2019

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“…[80] Pour et al suggested that the reaction between CO and H 2 producing *HCO limits the FTS reaction during the CO 2 hydrogenation. [81]…”

Section: Reaction Mechanismmentioning

confidence: 99%

Heterogeneous Catalytic Systems for Carbon Dioxide Hydrogenation to Value‐Added Chemicals

et al. 2023

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Utilizing renewable energy to hydrogenate carbon dioxide into fuels eliminates massive CO2 emissions from the atmosphere and diminishes our need for using fossil fuels. This review presents the most recent developments for designing heterogeneous catalysts for the hydrogenation of CO2 to formate, methanol, and C2+ hydrocarbons. Thermodynamic challenges and mechanistic insights are discussed, providing a strong foundation to propose a suitable catalyst. The main body of this review focuses on nanostructured catalysts for constructing efficient heterogeneous systems. The most important factors affecting catalytic performance are highlighted, including active metals, supports and promoters that can potentially be used. The summary of the results and the outlook are presented in the final section. During the past few decades, heterogeneous CO2 hydrogenation has gained much attention and made tremendous progress. Thus, many highly efficient catalysts have been studied to discover their active sites and provide mechanistic insights. This paper summarizes recent advances in CO2 hydrogenation and its conversion into various hydrocarbons such as formate, methanol, and C2+ products. As for formate production, Au and Ru nanocatalysts show superior activity. However, considering the catalyst cost, Cu‐based catalysts have an excellent prospect for methanol production, among other catalysts. Ultra‐small nanoparticles and nanoclusters appear promising to provide highly active cost‐effective catalysts. A growing number of researchers are investigating the possibility of directly synthesizing C2+ products through CO2 hydrogenation. The major challenge in producing heavy hydrocarbons is breaking the ASF limitations, which have been achieved over bifunctional catalysts using zeolites. Using suitable support and promoter can lead to a superior activity, ascribed to structural, electronic, and chemical promotional effects.

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“…Pour et al , developed LHHW type kinetic models and fitted the parameters to experimental data from a precipitated iron catalyst investigated in a spinning basket reactor. A significant difference to previous modeling approaches is that their models are derived from elementary reaction steps and describe the consecutive reaction scheme with only one kinetic expression.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of CO₂ Hydrogenation to Long-Chain Hydrocarbons on a Supported Iron Catalyst

Brübach

Hodonj

Pfeifer

2022

Ind. Eng. Chem. Res.

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Hydrogenation of CO2 to long-chain hydrocarbons via combined reverse water gas shift (RWGS) and Fischer–Tropsch (FT) gained much attention in the last years as a way to produce sustainable hydrocarbons for the chemical industry or fuel applications. Despite the large amount of interest in the reaction, so far only a few studies have been conducted regarding the kinetics. In this study we carefully investigated the kinetics of an alumina supported iron catalyst at 280–320 °C, 10–20 bar, 900–120 000 mLN h–1 g–1, and a H2/CO2 molar inlet ratio of 2–4. Special attention was focused toward the thermodynamic constraints under reaction conditions. Based on elementary reaction steps according to recent mechanistic investigations, we derived new Langmuir–Hinshelwood–Hougen–Watson type kinetic expressions which allow an excellent reproduction of the experimental data and outperform existent models. Possible model combinations were discriminated against each other, and the best fit was obtained for the assumption of H-assisted CO2 and H-assisted CO dissociation mechanisms for RWGS and FT, respectively. Model uncertainties that are introduced by the RWGS being close to equilibrium are discussed in detail and are possibly a reason for strongly varying results for activation energies between different studies. The detrimental effect of water vapor on the reaction progression is analyzed numerically and can be attributed to two parameters: kinetic inhibition via strong adsorption of oxygen containing species and thermodynamic constraints by shifting the equilibrium CO partial pressures to lower values.

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A new LHHW kinetic model for CO2 hydrogenation over an iron catalyst

Cited by 12 publications

References 40 publications

CO2 hydrogenation to high-value products via heterogeneous catalysis

CO2 hydrogenation to high-value products via heterogeneous catalysis

Heterogeneous Catalytic Systems for Carbon Dioxide Hydrogenation to Value‐Added Chemicals

Kinetic Analysis of CO₂ Hydrogenation to Long-Chain Hydrocarbons on a Supported Iron Catalyst

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A new LHHW kinetic model for CO2 hydrogenation over an iron catalyst

Cited by 12 publications

References 40 publications

CO2 hydrogenation to high-value products via heterogeneous catalysis

CO2 hydrogenation to high-value products via heterogeneous catalysis

Heterogeneous Catalytic Systems for Carbon Dioxide Hydrogenation to Value‐Added Chemicals

Kinetic Analysis of CO2 Hydrogenation to Long-Chain Hydrocarbons on a Supported Iron Catalyst

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Product

Resources

About

Kinetic Analysis of CO₂ Hydrogenation to Long-Chain Hydrocarbons on a Supported Iron Catalyst