Nanostructured Ce1−Zr O2 solid solutions produced by mechanochemical processing

Carbajal-Ramos, I.A.; Andrade-Gamboa, J.; Gennari, F.C.

doi:10.1016/j.matchemphys.2012.11.039

Cited by 10 publications

(15 citation statements)

References 36 publications

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“…A slight difference was observed in the first maximum zone, 500 • C for PI and 450 • C for MR. As a consequence of the preparation method, the MR support was slightly contaminated with Fe (<5 at.%) [52]. The decrease of the peak temperature could be associated with iron incorporation in Ce 0.8 Zr 0.2 O 2 , in agreement with previous studies [61].…”

Section: Characterization Of Ru-catalystssupporting

confidence: 89%

“…After milling, the samples were washed with distilled water in order to eliminate the NaCl produced as sub-product of the reaction. The samples were then submitted to calcination at 600 • C for 5 h [52]. The final sample is hereafter indicated as MR.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Moreover, the disparity in the intensity of the peaks indicates different amount of hydrogen consumption for each support. As RuPI and PI samples present no impurities, the hydrogen consumption associated with the sample reduction was evaluated only for these cases [52].…”

Section: Characterization Of Ru-catalystsmentioning

confidence: 99%

“…S3a). The differences observed between both supports could be ascribed to iron contamination introduced during synthesis of MR [52]. Basic oxides as Fe 2 O 3 promote acetone formation [69,70] if the support is not reduced or the reduction is performed at low temperatures.…”

Section: Catalytic Activity In Esr For Ru Catalystsmentioning

confidence: 99%

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Catalytic behavior of Ru supported on Ce0.8Zr0.2O2 for hydrogen production

Carbajal-Ramos

Gómez

Condó

et al. 2016

Applied Catalysis B: Environmental

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Section: Characterization Of Ru-catalystssupporting

confidence: 89%

Section: Catalyst Preparationmentioning

confidence: 99%

Section: Characterization Of Ru-catalystsmentioning

confidence: 99%

Section: Catalytic Activity In Esr For Ru Catalystsmentioning

confidence: 99%

See 2 more Smart Citations

Catalytic behavior of Ru supported on Ce0.8Zr0.2O2 for hydrogen production

Carbajal-Ramos

Gómez

Condó

et al. 2016

Applied Catalysis B: Environmental

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“…Materials prepared mechanochemically have been reported to show increased oxygen storage capacity and surface area [21]. Ceria-zirconia mixed metal oxides prepared via mechanochemical grinding also show good mixing of the two components, however, their efficacy as catalysts for VOC oxidation has not been established [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Ceria–Zirconia Mixed Metal Oxides Prepared via Mechanochemical Grinding of Carbonates for the Total Oxidation of Propane and Naphthalene

et al. 2019

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A series of ceria–zirconia mixed metal oxides with varying metal ratios were prepared by the calcination of precursors synthesized by mechanochemical grinding of the metal carbonates, and tested for catalytic naphthalene and propane total combustion. The mechanically-mixed metal oxides were more active for both propane and naphthalene total oxidation compared to the parent metal oxides. Ce0.95Zr0.05Ox was the most active catalyst for the total combustion of propane and naphthalene. Catalysts were characterized by x-ray diffraction, BET surface area, laser Raman spectroscopy, temperature programmed reduction, scanning electron microscopy with energy dispersive x-ray analysis and x-ray photoelectron spectroscopy techniques. Formation of ceria–zirconia solid solutions was observed for catalysts with a zirconia content of 10% or lower, whereas ceria and zirconia phase separation was observed when zirconia content was above 25%. Surface area increased when ceria and zirconia were mixed, and the reduction temperature of the bulk shifted to lower temperatures upon increasing zirconia content. Incorporation of zirconia was found to increase the relative concentration of surface oxygen defects compared to pure ceria, with low amounts of zirconia showing the greatest increase. The concentration of oxygen defects correlates with propane and naphthalene total oxidation activity. The enhanced total oxidation activity occurs as a result of the increased number of oxygen defects and the higher surface area. The results demonstrate that mechanochemical preparation from carbonate precursors was an effective route to make active catalysts.

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Mechanochemical preparation of ceria-zirconia catalysts for the total oxidation of propane and naphthalene Volatile Organic Compounds

Shah

Day

Davies

et al. 2019

Applied Catalysis B: Environmental

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A range of ceria-zirconia mixed metal oxide catalysts were synthesised by mechanochemical milling from nitrate precursors and tested for propane and naphthalene total oxidation. The mixed CeZrOx metal oxide catalysts were more active compared to pure CeO2 and ZrO2, with the Ce0.90Zr0.10Ox catalyst the most active for both propane and naphthalene total oxidation. Catalysts were characterised by XRD, TGA, Raman spectroscopy, BET surface area, XPS, TEM and SEM-EDX techniques. Formation of CeZrOx solid solutions were observed for Zr content ranging from 5 to 25%, and phase separated materials were observed for higher Zr content of 50%. The incorporation of Zr into the CeO2 lattice increased the surface area compared to pure CeO2 and ZrO2, with evidence of a surface enrichment of Zr when concentrations were compared to the bulk. Incorporation of Zr was found to increase the surface concentration of oxygen defects in the CeZrOx mixed metal oxides, the concentration of these defect on the catalysts follows a similar trend to the propane and naphthalene total 2 oxidation activity: The increased presence of oxygen defects and reducibility are factors responsible for the enhanced total oxidation activity of the mixed metal oxide catalysts, and the mechanochemical method is an effective preparation route for these active catalysts.

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Nanostructured Ce1−Zr O2 solid solutions produced by mechanochemical processing

Cited by 10 publications

References 36 publications

Catalytic behavior of Ru supported on Ce0.8Zr0.2O2 for hydrogen production

Catalytic behavior of Ru supported on Ce0.8Zr0.2O2 for hydrogen production

Ceria–Zirconia Mixed Metal Oxides Prepared via Mechanochemical Grinding of Carbonates for the Total Oxidation of Propane and Naphthalene

Mechanochemical preparation of ceria-zirconia catalysts for the total oxidation of propane and naphthalene Volatile Organic Compounds

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