The Interaction of CO<sub>2</sub> with CeO<sub>2</sub> Powder Explored by Correlating Adsorption and Thermal Desorption Analyses

Schweke, D.; Zalkind, S.; Attia, Smadar; Bloch, J.

doi:10.1021/acs.jpcc.8b01299

Cited by 27 publications

(21 citation statements)

References 45 publications

(105 reference statements)

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“…In situ DRIFTS spectra of CO 2 adsorbed on supported In 2 O 3 catalysts with the pure carriers and In 2 O 3 serving as references. Adsorbed species attributed to the bands detected are indicated, ,− and u, b, and p stand for a uni-, bi-, or polydentate adsorption geometries, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Firstly, the higher abundance of vacancies in In2O3 in this catalyst implies a greater number of active sites in the vicinity of the support. Secondly, the reported geometries of adsorption of CO2 on m-ZrO2, including formates and carbonates at a temperature greater than 450 K 15,16 rather than only carbonates as indicated for CeO2, 25,45 are likely more suited for transformation into methanol.…”

Section: Figure 6cmentioning

confidence: 95%

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Role of Zirconia in Indium Oxide-Catalyzed CO₂Hydrogenation to Methanol

et al. 2019

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Monoclinic zirconia has been uncovered as a carrier able to substantially boost the activity of indium oxide for CO2 hydrogenation to methanol. Here, electronic, geometric, and interfacial phenomena associated with this unique effect are investigated. Generating mixed In-Zr oxides by coprecipitation does not improve performance, excluding a primary role of electronic parameters.Since even only 1 mol% of indium stabilizes the metastable tetragonal phase of zirconia, the relevance of its crystalline structure is explored in impregnated solids. Both tetragonal and monoclinic ZrO2 permit epitaxial growth of In2O3, but a delicate lattice mismatching leads to a slightly lower dispersion of the oxide on the second, which is observed in the form of subnanometric islands on the carrier. More importantly, compressive and tensile forces are exerted on In2O3, respectively, which inhibit and foster oxygen vacancy formation, in line with the low and greatly enhanced indium-specific activity of the catalysts prepared with the two polymorphs.Hence, a deposition synthesis method is essential to unlock the role of monoclinic zirconia.According to analyses with reference In2O3-based catalysts supported on alumina and ceria, which display diverse ability to activate CO2 on their surface, the direct participation of monoclinic zirconia in a parallel pathway to methanol is put forward as a second origin of activity boosting.The latter is likely enabled by the abundancy of indium active sites vicinal to the interface and/or by a more favorable CO2 adsorption geometry onto this carrier or onto an alternative bimetallic site possibly produced.

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Section: Resultsmentioning

confidence: 99%

Section: Figure 6cmentioning

confidence: 95%

Role of Zirconia in Indium Oxide-Catalyzed CO₂Hydrogenation to Methanol

et al. 2019

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“…According to the literature, CeO 2 is widely used as a catalyst for the conversion of CO 2 to methanol and other valuable fuels. The relative ease of switching between Ce +4 /Ce +3 oxidation states and high oxygen storage capacity are considered key factors for the catalytic activity of CeO 2 [ 59 ]. These properties can be adversely impacted by the presence of acid gases (CO 2 , SO 2 , etc.…”

Section: Resultsmentioning

confidence: 99%

CeO2-Blended Cellulose Triacetate Mixed-Matrix Membranes for Selective CO2 Separation

et al. 2021

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Due to the high affinity of ceria (CeO2) towards carbon dioxide (CO2) and the high thermal and mechanical properties of cellulose triacetate (CTA) polymer, mixed-matrix CTA-CeO2 membranes were fabricated. A facile solution-casting method was used for the fabrication process. CeO2 nanoparticles at concentrations of 0.32, 0.64 and 0.9 wt.% were incorporated into the CTA matrix. The physico-chemical properties of the membranes were evaluated by SEM-EDS, XRD, FTIR, TGA, DSC and strain-stress analysis. Gas sorption and permeation affinity were evaluated using different single gases. The CTA-CeO2 (0.64) membrane matrix showed a high affinity towards CO2 sorption. Almost complete saturation of CeO2 nanoparticles with CO2 was observed, even at low pressure. Embedding CeO2 nanoparticles led to increased gas permeability compared to pristine CTA. The highest gas permeabilities were achieved with 0.64 wt.%, with a threefold increase in CO2 permeability as compared to pristine CTA membranes. Unwanted aggregation of the filler nanoparticles was observed at a 0.9 wt.% concentration of CeO2 and was reflected in decreased gas permeability compared to lower filler loadings with homogenous filler distributions. The determined gas selectivity was in the order CO2/CH4 > CO2/N2 > O2/N2 > H2/CO2 and suggests the potential of CTA-CeO2 membranes for CO2 separation in flue/biogas applications.

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“…Similar works have also studied the interactions of carbon dioxide (CO 2 ) with ceria. These investigations showed that CO 2 adsorbs to the surface of ceria in five modes, some strongly adsorbed while others weakly 24‐26 …”

Section: Introductionmentioning

confidence: 99%

Surface properties of Ca, Ti‐doped CeO₂ and their influence on the reverse water‐gas shift reaction

et al. 2021

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CeO2‐based materials can be found in a variety of catalytic processes, including the reverse water‐gas shift (RWGS) reaction. Nevertheless, the interaction of molecular gases with the surfaces of such materials is still not clear. Recently, some progress was reported on the incorporation of neodymium (Nd) and calcium (Ca) into ceria and their effect on H2O and CO2 adsorption. Titanium (Ti), which has a much smaller ionic radius, has the ability to change the interaction landscape, both as a co‐dopant to Ca and as a sole dopant in the CeO2 system. In this study, the interactions of environmental gases (i.e., water vapor and CO2) on the surface of Ti‐doped CeO2 and Ca,Ti co‐doped CeO2 were investigated. Ti addition to CeO2 was shown to decrease water vapor uptake by up to 25% all while maintaining similar heats of adsorption. In the case of CO2 adsorption, Ti addition to CeO2 had lowered the uptake by more than 50% as well as lowering the heat of adsorption. Co‐doping with Ti and Ca showed small decrease in H2O uptake accompanied with increased heat of adsorption. For CO2, the changes to the uptake and energetics were small and did not indicate a specific trend. The RWGS catalytic performance showed improvement by the addition of Ti in certain levels. The relationship between the doping, surface properties, gas‐surface interactions, and catalytic performance is discussed.

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The Interaction of CO₂ with CeO₂ Powder Explored by Correlating Adsorption and Thermal Desorption Analyses

Cited by 27 publications

References 45 publications

Role of Zirconia in Indium Oxide-Catalyzed CO₂Hydrogenation to Methanol

Role of Zirconia in Indium Oxide-Catalyzed CO₂Hydrogenation to Methanol

CeO2-Blended Cellulose Triacetate Mixed-Matrix Membranes for Selective CO2 Separation

Surface properties of Ca, Ti‐doped CeO₂ and their influence on the reverse water‐gas shift reaction

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The Interaction of CO2 with CeO2 Powder Explored by Correlating Adsorption and Thermal Desorption Analyses

Cited by 27 publications

References 45 publications

Role of Zirconia in Indium Oxide-Catalyzed CO2Hydrogenation to Methanol

Role of Zirconia in Indium Oxide-Catalyzed CO2Hydrogenation to Methanol

CeO2-Blended Cellulose Triacetate Mixed-Matrix Membranes for Selective CO2 Separation

Surface properties of Ca, Ti‐doped CeO2 and their influence on the reverse water‐gas shift reaction

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Product

Resources

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The Interaction of CO₂ with CeO₂ Powder Explored by Correlating Adsorption and Thermal Desorption Analyses

Role of Zirconia in Indium Oxide-Catalyzed CO₂Hydrogenation to Methanol

Role of Zirconia in Indium Oxide-Catalyzed CO₂Hydrogenation to Methanol

Surface properties of Ca, Ti‐doped CeO₂ and their influence on the reverse water‐gas shift reaction