Mechanisms and kinetics of CO 2 hydrogenation to value-added products: A detailed review on current status and future trends

Saeidi, Samrand; Najari, Sara; Fazlollahi, Farhad; Nikoo, Maryam Khoshtinat; Sefidkon, F; Klemeš, Jiří Jaromír; Baxter, Larry

doi:10.1016/j.rser.2017.05.204

Cited by 182 publications

(116 citation statements)

References 209 publications

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“…[84] They identified five steps with different kinetic regimes,i ndicated as "episodes of synthesis". [35] These mechanismsc orrespond to the individualR WGS and FTS reactions. In episode I, the reactants adsorb onto the catalyst surfacea nd carbon deposition takes place predominantly.T his shows that the freshly reduced catalyst is not active in FTS.…”

Section: Reaction Mechanismsmentioning

confidence: 99%

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

2019

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ReviewsScheme2.Redox (left) and associative (right) reaction pathways for the RWGS reaction. [82] Scheme3.Reduction and carburization steps of an iron-based catalyst. [83] Scheme4.Catalytic activity (top) and iron-phase composition of the catalyst (bottom) as af unction of time during the reaction. Reactionconditions:H 2 / CO 2 = 3, 250 8C, 1MPa, FeÀAlÀCuÀ9K catalyst. FT refers to the Fischer-Tropschr eaction. Arrows indicatethe increase or decrease of reaction yield/iron phase during ac ertain episode. [84] ChemSusChem

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Section: Reaction Mechanismsmentioning

confidence: 99%

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

2019

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“…In the redox mechanism the oxidation reduction cycle occurring on the catalyst surface is responsible for the reaction . CO 2 is firstly adsorbed on the reduced metal sites or metal oxide sites, and then subsequently reacts with them to form CO. After that the oxidized catalyst is reduced by H 2 and the reduced sites are formed again …”

Section: Current Understanding Of Co2 Catalytic Hydrogenationmentioning

confidence: 99%

“…The associative mechanism, also known as dissociative or formate mechanism is an adsorption‐desorption model where the adsorbed species interact to form an adsorbed intermediate (carbonate, formate, carbonyl, etc.) as a critical step in the RWGS process which then decomposes to form H 2 and a mono‐dentate carbonate . Prevailingly a bidentate formate reaction intermediate is produced through the CO 2 * reaction with dissociated H* by the adsorption of preferably oxygen atoms to the metal surface.…”

Section: Current Understanding Of Co2 Catalytic Hydrogenationmentioning

confidence: 99%

Recent Developments in the Modelling of Heterogeneous Catalysts for CO₂ Conversion to Chemicals

et al. 2020

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Density functional theory (DFT) of the CO2 behavior on the catalyst surface provides valuable insights about the C=O bond activation, information about adsorption and dissociation of CO2, understanding the elementary steps involved in the mechanism of the CO2 hydrogenation reaction. Nowadays, DFT computational studies for the catalytic hydrogenation of CO2 are becoming very popular. Therefore, this article is focused on a comprehensive review of the DFT studies in thermocatalytic hydrogenation of CO2 at the gas‐surface interface and discusses three aspects: 1) processes taking place on the surfaces and facets of transition metal heterogeneous catalysts, 2) adsorption of CO2 on surfaces of different transition metals; 3) current understanding of reaction mechanisms taking place on the catalytic surface for the production of different compounds. A detailed schematic overview of the possible CO2 hydrogenation mechanisms and DFT simulations presented here will enhance the current understanding of the CO2 catalytic hydrogenation.

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“…[6] The transformation of CO 2 into olefins generally proceeds through a modified Fischer-Tropsch (FTS) process using synthesis gas over an iron catalyst. [7][8][9] Here, CO 2 is first transformed into CO via a reverse water-gas shift (RWGS) reaction and further converted to olefins via a conventional FTS process. The main drawback of this route lies in the first hydrogenation of CO 2 to CO.…”

Section: Introductionmentioning

confidence: 99%

Tandem Conversion of CO₂ to Valuable Hydrocarbons in Highly Concentrated Potassium Iron Catalysts

et al. 2019

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The alarming atmospheric concentration and continuous emissions of carbon dioxide (CO2) require immediate action. As a result of advances in CO2 capture and sequestration technologies (generally involving point sources such as energy generation plants), large amounts of pure CO2 will soon be available. In addition to geological storage and other applications of the captured CO2, the development of technologies able to convert this carbon feedstock into commodity chemicals may pave the way towards a more sustainable economy. Here, we present a novel multifunctional catalyst consisting of Fe2O3 encapsulated in K2CO3 that can transform CO2 into olefins via a tandem mechanism. In contrast to traditional systems in Fischer‐Tropsch reactions, we demonstrate that when dealing with CO2 conversion (in contrast to CO), very high K loadings are key to activate CO2 via the well‐known ‘potassium carbonate mechanism’. The proposed catalytic process is demonstrated to be as productive as existing commercial processes based on synthesis gas while relying on economically and environmentally advantageous CO2 feedstock.

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Mechanisms and kinetics of CO 2 hydrogenation to value-added products: A detailed review on current status and future trends

Cited by 182 publications

References 209 publications

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

Recent Developments in the Modelling of Heterogeneous Catalysts for CO₂ Conversion to Chemicals

Tandem Conversion of CO₂ to Valuable Hydrocarbons in Highly Concentrated Potassium Iron Catalysts

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Mechanisms and kinetics of CO 2 hydrogenation to value-added products: A detailed review on current status and future trends

Cited by 182 publications

References 209 publications

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

Recent Developments in the Modelling of Heterogeneous Catalysts for CO2 Conversion to Chemicals

Tandem Conversion of CO2 to Valuable Hydrocarbons in Highly Concentrated Potassium Iron Catalysts

Contact Info

Product

Resources

About

Recent Developments in the Modelling of Heterogeneous Catalysts for CO₂ Conversion to Chemicals

Tandem Conversion of CO₂ to Valuable Hydrocarbons in Highly Concentrated Potassium Iron Catalysts