Insights into the CO<sub>2</sub> deoxygenation to CO over oxygen vacancies of CeO<sub>2</sub>

Ju, Tz-Jie; Wang, Chi-Han; Lin, Shawn D.

doi:10.1039/c9cy00111e

Cited by 13 publications

(10 citation statements)

References 27 publications

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“…For example, CeO 2 -NC and CeO 2 -NR are reported to transform into CeO 2 -NO at high temperature in a reducible atomsphere. 120,153 This is because the CeO 2 (111) facet is thermodynamically more favorable, which is verified by both experimental and theoretical studies. 153,154 Metal doping is another method for improving CeO 2 -based catalysts.…”

Section: Reaction With Alkanessupporting

confidence: 59%

“…120,153 This is because the CeO 2 (111) facet is thermodynamically more favorable, which is verified by both experimental and theoretical studies. 153,154 Metal doping is another method for improving CeO 2 -based catalysts. For Ir/CeO 2 catalysts, La, Pr, and Zr doping resulted in several advantages, such as increasing the oxygen vacancy, enhancing metal dispersion, and inhibiting the aggregation of CeO 2 particles.…”

Section: Reaction With Alkanessupporting

confidence: 59%

“…This is because the surface facet may transform at high temperatures. For example, CeO 2 -NC and CeO 2 -NR are reported to transform into CeO 2 -NO at high temperature in a reducible atomsphere. , This is because the CeO 2 (111) facet is thermodynamically more favorable, which is verified by both experimental and theoretical studies. , …”

Section: Reaction With Alkanesmentioning

confidence: 99%

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Application of Ceria in CO₂ Conversion Catalysis

et al. 2019

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The growing threat of global climate change has received increasing attention in recent years. The conversion of CO2 to fuels and chemicals is vital for reducing emissions of greenhouse gases and neutralizing the negative impacts of CO2 emissions on the environment. Various CO2 conversion routes have been proposed on the basis of heterogeneous catalysis. However, the development of a high-performance catalyst with satisfactory activity and selectivity remains challenging. In past decades, the role of ceria in activating CO2 under mild conditions has been widely demonstrated, which has inspired the design of novel heterogeneous catalysts and contributed to the extensive catalytic applications in CO2 conversion reactions. The applications of ceria have been studied in three groups of CO2 conversion reactions, including hydrogenation of CO2, activation of CO2 with alkanes, and nonreductive CO2 transformations. Investigations into these reactions show that CeO2 is a highly tunable material with great potential for CO2 catalysis due to its unique properties such as abundant oxygen vacancy and metal–support interaction. The catalytic performance of CeO2-based catalysts can be improved by various strategies including metal doping, forming mixed oxides or solid solution, as well as morphological control. Future works are proposed to address the challenges in current research and to further advance the CeO2-based catalysts in CO2 conversion reactions.

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Section: Reaction With Alkanessupporting

confidence: 59%

Section: Reaction With Alkanessupporting

confidence: 59%

Section: Reaction With Alkanesmentioning

confidence: 99%

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Application of Ceria in CO₂ Conversion Catalysis

et al. 2019

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“…The identification of discrete FeO and CeO 2 nanoparticles further confirmed that the sample was indeed a nanocomposite of FeO and CeO 2 (in agreement with XRD), as opposed to a ternary oxide phase. Since pure CeO 2 demonstrated negligible CO 2 hydrogenation activity under Xe lamp irradiation, it can be concluded that the function of CeO 2 in the FeCe-x catalysts was to (1) maintain a high dispersion of active FeO and Fe 0 components and (2) act as a cocatalyst to assist with the activation of CO 2 (e.g., under photothermal reaction conditions, CeO 2 will exist as CeO 2-x , thus activating CO 2 adsorption through surface V O ), as suggested by other reports [33][34][35] .…”

Section: Morphological Evolution Of the Fece-x Catalystsmentioning

confidence: 59%

FeO–CeO2 nanocomposites: an efficient and highly selective catalyst system for photothermal CO2 reduction to CO

et al. 2020

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Solar-driven catalysis is a promising strategy for transforming CO 2 into fuels and valuable chemical feedstocks, with current research focusing primarily on increasing CO 2 conversion efficiency and product selectivity. Herein, a series of FeO-CeO 2 nanocomposite catalysts were successfully prepared by H 2 reduction of Fe(OH) 3 -Ce(OH) 3 precursors at temperatures (x) ranging from 200 to 600°C (the obtained catalysts are denoted as FeCe-x). An FeCe-300 catalyst with an Fe:Ce molar ratio of 2:1 demonstrated outstanding performance for photothermal CO 2 conversion to CO in the presence of H 2 under Xe lamp irradiation (CO 2 conversion, 43.63%; CO selectivity, 99.87%; CO production rate, 19.61 mmol h −1 g cat −1; stable operation over 50 h). Characterization studies using powder X-ray diffraction and highresolution transmission electron microscopy determined that the active catalyst comprises FeO and CeO 2 nanoparticles. The selectivity to CO of the FeCe-x catalysts decreased as the reduction temperature (x) increased in the range of 300-500°C due to the appearance of metallic Fe 0 , which introduced an additional reaction pathway for the production of CH 4 . In situ diffuse reflectance infrared Fourier transform spectroscopy identified formate, bicarbonate and methanol as important reaction intermediates during light-driven CO 2 hydrogenation over the FeCe-x catalysts, providing key mechanistic information needed to explain the product distributions of CO 2 hydrogenation on the different catalysts.

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“…The different densities of the polymer brushes on the ceria will lead to more or less active positions for catalysis. The CeO 2 surface is known for adsorbing CO 2 and creating different types of carbonates [47]. These carbonates are hydrogen carbonate, bidentate carbonate, monodentate carbonate, and bridged carbonate [48].…”

Section: Co2 Adsorptionmentioning

confidence: 99%

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

et al. 2021

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The monolithic materials of reduced graphene oxide (rGO) can be used successfully in CO2 adsorption. Here, the incorporation of CeO2 particles with and without polymer brushes grafted from the particles showed that the structural properties could be changed, affecting the adsorption of CO2. Polymer brushes of (1) poly(acrylic acid) (PAA), (2) poly(vinyl caprolactam) (PVCL) and (3) poly[(2-(methacryloyloxy)ethyl) trimethylammonium chloride] (PMETAC) were grafted from CeO2 via reversible addition−fragmentation chain transfer (RAFT) polymerization. The preparation of monoliths of rGO with different modified CeO2 particles led to different thermal properties (TGA), structural changes (BET isotherms) and CO2 adsorption. The responsive character of the CeO2@polymer was proven by the DLS and UV results. The responsive character of the particles incorporated into the rGO monolith affected not only the adsorption capacity but also the microstructure and values of the surface volume of the pores of the monolith. Monoliths with porosity values for better adsorption were affected by the responsive character of the polymer.

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Insights into the CO₂ deoxygenation to CO over oxygen vacancies of CeO₂

Abstract: The reversibly regenerated oxygen vacancies of CeO2 can catalyze CO2 deoxygenation and the reaction is initially surface reaction limited.

Cited by 13 publications

References 27 publications

Application of Ceria in CO₂ Conversion Catalysis

Application of Ceria in CO₂ Conversion Catalysis

FeO–CeO2 nanocomposites: an efficient and highly selective catalyst system for photothermal CO2 reduction to CO

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

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Insights into the CO2 deoxygenation to CO over oxygen vacancies of CeO2

Abstract: The reversibly regenerated oxygen vacancies of CeO2 can catalyze CO2 deoxygenation and the reaction is initially surface reaction limited.

Cited by 13 publications

References 27 publications

Application of Ceria in CO2 Conversion Catalysis

Application of Ceria in CO2 Conversion Catalysis

FeO–CeO2 nanocomposites: an efficient and highly selective catalyst system for photothermal CO2 reduction to CO

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

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Insights into the CO₂ deoxygenation to CO over oxygen vacancies of CeO₂

Application of Ceria in CO₂ Conversion Catalysis

Application of Ceria in CO₂ Conversion Catalysis