Catalytic and photocatalytic water gas shift reaction (WGSR) using a continuous flow, gas phase reactor

Bingham, Michael; Mills, Andrew

doi:10.1016/j.jphotochem.2021.113133

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…The significant enhancement in the conversion yields to hydrogen under CO flow could indicate the participation of CO in a side reaction for the production of hydrogen as a byproduct, such as photoinduced water−gas shift reaction (WGSR: CO + H 2 O ⇌ H 2 + CO 2 ). 34 Gas phase monitoring by MS and GC confirms the coproduction of carbon dioxide under these conditions. However, the level of produced CO 2 cannot be compared to that under CO 2 + H 2 O reactant flow, since in that latter case CO 2 is always an excess reactant.…”

Section: ■ Results and Discussionmentioning

confidence: 80%

“…Although our main focus was the enhancement effect of probe molecules on methane production, it is interesting to note that in the presence of CO flow, the maximum amount of hydrogen produced was around five times higher than under standard CO 2 + H 2 O reactant flow (Figure S6). The significant enhancement in the conversion yields to hydrogen under CO flow could indicate the participation of CO in a side reaction for the production of hydrogen as a byproduct, such as photoinduced water–gas shift reaction (WGSR: CO + H 2 O ⇌ H 2 + CO 2 ) . Gas phase monitoring by MS and GC confirms the coproduction of carbon dioxide under these conditions.…”

Section: Resultsmentioning

confidence: 88%

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Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO₂ over Pt/TiO₂

Dankar,

Rouchon,

Rivallan

et al. 2024

ACS Appl. Mater. Interfaces

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Photocatalytic conversion of CO 2 with H 2 O is an attractive application that has the potential to mitigate environmental and energy challenges through the conversion of CO 2 to hydrocarbon products such as methane. However, the underlying reaction mechanisms remain poorly understood, limiting real progress in this field. In this work, a mechanistic investigation of the CO 2 photocatalytic reduction on Pt/TiO 2 is carried out using an operando FTIR approach, combined with chemometric data processing and isotope exchange of ( 12 CO 2 + H 2 O) toward ( 13 CO 2 + H 2 O). Multivariate curve resolution analysis applied to operando spectra across numerous cycles of photoactivation and the CO 2 reaction facilitates the identification of principal chemical species involved in the reaction pathways. Moreover, specific probe-moleculeassisted reactions, including CO and CH 3 COOH, elucidate the capacity of selected molecules to undergo methane production under irradiation conditions. Finally, isotopic exchange reveals conclusive evidence regarding the nature of the identified species during CO 2 conversion and points to the significant role of acetates resulting from the C−C coupling reaction as key intermediates in methane production from the CO 2 photocatalytic reduction reaction.

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Section: ■ Results and Discussionmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 88%

Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO₂ over Pt/TiO₂

Dankar,

Rouchon,

Rivallan

et al. 2024

ACS Appl. Mater. Interfaces

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“…23,24 However, the study of alkali effect on the Ag metal surface at the atomic level is scarce despite the certain catalytic capacity of silver to the WGSR. 25–28…”

Section: Introductionmentioning

confidence: 99%

“…23,24 However, the study of alkali effect on the Ag metal surface at the atomic level is scarce despite the certain catalytic capacity of silver to the WGSR. [25][26][27][28] In this work, the pathways of the WGSR are investigated by the DFT method on a clean Ag(111) surface and the corresponding K-promoted surface (K/Ag(111)) to explore the effect of K additive on the mechanism and activity of the WGSR on Ag catalysts. In the light of energetic and electronic effect analysis, the origin of the K effect is revealed and factors like the K-O distance and K coverage affecting the K promotion effect are also clarified.…”

Section: Introductionmentioning

confidence: 99%

A density functional theory study of a water gas shift reaction on Ag(111): potassium effect

Wang

Zhang

et al. 2023

Phys. Chem. Chem. Phys.

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Synthetic Chemistry in Flow: From Photolysis & Homogeneous Photocatalysis to Heterogeneous Photocatalysis

Feng,

2024

ChemSusChem

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Photocatalytic synthesis of value‐added chemicals has gained increasing attention in recent years owing to its versatility in driving many important reactions under ambient conditions. Selective hydrogenation, oxidation, coupling, and halogenation with a high conversion of the reactants have been realized using designed photocatalysts in batch reactors with small volumes at a laboratory scale; however, scaling‐up remains a critical challenge due to inefficient utilization of incident light and active sites of the photocatalysts, resulting in poor catalytic performance that hinders its practical applications. Flow systems are considered one of the solutions for practical applications of light‐driven reactions and have experienced great success in photolytic and homogeneous photocatalysis, yet their applications in heterogeneous photocatalysis are still under development. In this perspective, we have summarized recent progress in photolytic and photocatalytic synthetic chemistry performed in flow systems from the view of reactor design with a special focus on heterogeneous photocatalysis. The advantages and limitations of different flow systems, as well as some practical considerations of design strategies are discussed.

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Catalytic and photocatalytic water gas shift reaction (WGSR) using a continuous flow, gas phase reactor

Cited by 6 publications

References 28 publications

Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO₂ over Pt/TiO₂

Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO₂ over Pt/TiO₂

A density functional theory study of a water gas shift reaction on Ag(111): potassium effect

Synthetic Chemistry in Flow: From Photolysis & Homogeneous Photocatalysis to Heterogeneous Photocatalysis

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Catalytic and photocatalytic water gas shift reaction (WGSR) using a continuous flow, gas phase reactor

Cited by 6 publications

References 28 publications

Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO2 over Pt/TiO2

Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO2 over Pt/TiO2

A density functional theory study of a water gas shift reaction on Ag(111): potassium effect

Synthetic Chemistry in Flow: From Photolysis & Homogeneous Photocatalysis to Heterogeneous Photocatalysis

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Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO₂ over Pt/TiO₂

Evidence on C–C Coupling to Acetate as Key Reaction Intermediate in Photocatalytic Reduction of CO₂ over Pt/TiO₂