The influence of H2O2 on the properties of CeO2-ZrO2 mixed oxides

Deng, Jie; Zhou, Yi; Cui, Yajuan; Li, Lan; Wang, Jianli; Yuan, Shandong; Chen, Yaoqiang

doi:10.1007/s10853-017-0765-7

Cited by 22 publications

(11 citation statements)

References 44 publications

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“…Temperature-programmed reduction (TPR) analysis was performed to study the oxygen mobility in the lattice structure of the CZ nanocomposite catalysts and their reducibility, after calcination. The results shown by the TPR profiles in Figure shows that CZ exhibited one reduction peak at 684 °C within 400–800 °C range, which is synonymous to the reduction of surface and bulk oxygen. , This shows that the reduction of Ce 4+ to Ce 3+ in CZ occurred at 684 °C. However, for FeCoCZa and FeCoCZb, the reduction of Ce 4+ to Ce 3+ occurred at lower temperatures of 576 and 495 °C, respectively.…”

Section: Resultsmentioning

confidence: 79%

“…The results shown by the TPR profiles in Figure 11 shows that CZ exhibited one reduction peak at 684 °C within 400−800 °C range, which is synonymous to the reduction of surface and bulk oxygen. 25,36 This shows that the reduction of Ce 4+ to Ce 3+ in CZ occurred at 684 °C. However, for FeCoCZa and FeCoCZb, the reduction of Ce 4+ to Ce 3+ occurred at lower temperatures of 576 and 495 °C, respectively.…”

Section: Energy and Fuelsmentioning

confidence: 85%

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Iron- and Cobalt-Doped Ceria–Zirconia Nanocomposites for Catalytic Cracking of Naphtha with Regenerative Capability

et al. 2017

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Series of nanosized iron-and cobalt-doped ceria−zirconia nanocomposites were prepared using a hydrothermal synthesis technique at 180 °C for 24 h, with the successful novel incorporation of both Co and Fe on ceria−zirconia, for n-hexane catalytic cracking. Effects of dopant ions on the improvement of intrinsic properties of ceria−zirconia nanocomposites were investigated using disparate characterization techniques. The synthesized ceria−zirconia nanocomposites exhibited similar X-ray diffraction (XRD) patterns, indicating full fusion of the metal ions into the ceria−zirconia lattice structure. The synthesized nanocomposite catalysts were tested for n-hexane cracking over 10 h time-on-stream, with no previous study or report for catalytic cracking of hexane via ceria−zirconia nanocomposites. Relatively high ethylene and propylene selectivity (both >62%) was obtained over CZ, FeCoCZa, and FeCoCZb over time-on-stream. Comparatively, the best catalytic activity and stability was exhibited by FeCoCZa with higher n-hexane conversion. Temperature and catalyst weight per feed flow rate (W/F) variations were investigated using the best catalyst (FeCoCZa). Higher conversions were obtained at higher temperature and lower W/F but with varied product selectivity and yield, over time-on-stream. In addition, the spent catalysts were successfully regenerated after catalytic testing via calcination at 600 °C for 4 h and reused for two additional cycles.

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Section: Resultsmentioning

confidence: 79%

Section: Energy and Fuelsmentioning

confidence: 85%

Iron- and Cobalt-Doped Ceria–Zirconia Nanocomposites for Catalytic Cracking of Naphtha with Regenerative Capability

et al. 2017

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“…However, in many studies, − the complex defect variation is simply equivalent to the lattice defect variation and is associated with the interaction. The variation of the surface defect is ignored because the surface defect accounts only for a small portion and could be covered by CuO after loading. − , However, unfortunately, the surface defect of CeO 2 seems to be more crucial since the surface defect with weakly adsorbed oxygen is thought to be beneficial to the active oxygen transfer and the bonding between metal ions and CeO 2 according to some experiments and theoretical calculations. ,− Thus, the neglect of complex changes in diverse defects is the main cause of the unclear defect–interaction relationship. To establish the accurate defect–interaction relationship and synthesize the catalysts with good activity, the influences of both surface and lattice defects need to be carefully considered.…”

Section: Introductionmentioning

confidence: 99%

Role of Two-Electron Defects on the CeO₂ Surface in CO Preferential Oxidation over CuO/CeO₂ Catalysts

Xia

Lao

et al. 2019

ACS Sustainable Chem. Eng.

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Owing to the peculiar synergistic interaction between CuO and CeO 2 at the interface, CuO/CeO 2 is one of the most efficient catalysts to purify a H 2 source, which is used in a proton exchange membrane fuel cell by preferential oxidation (PROX) of CO. The defective structure in CeO 2 is considered to be a crucial factor affecting the synergistic interaction. However, the defect−interaction relationship has not been well established due to the complex variation in different types of defects. Therefore, in this study, a novel ultrasound-assisted precipitation method was used to separately modulate diverse types of defects. The structural variation was explored by characterization techniques and theoretical calculations. It was found that the synergistic interaction was mainly related to two-electron defects on the CeO 2 surface. The two-electron defects could absorb O 2 to form the η 2 peroxide, and Cu ions could incorporate with the η 2 peroxide. Then, the two additional electrons in the two-electron defects would induce the electronic redispersion in CuO/CeO 2 , synchronously producing Cu + and Ce 3+ . The resulting Cu + and Ce 3+ were related to unsaturated CuO and redox capacity, which intimately affected the CO adsorption and oxygen activation. Thus, the catalytic performance was significantly promoted by increasing the amount of twoelectron defects in CeO 2 . Our study not only demonstrates a feasible way to finely control the synergistic interaction between CuO and CeO 2 but also deeply reveals the direct influence of two-electron defects on the CeO 2 surface on PROX.

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“… 67 The shift in the peak position from 1125 cm –1 as seen in the PEG samples to 1140 and 1135 cm –1 in the case of PEG-coated CeO 2 and Ce 0.5 Zr 0.5 O 2 , respectively, resulted from the change in the surrounding electric field. 63 The broad band observed at around 514, 494, and 500 cm –1 in CeO 2 , PEG-coated CeO 2 , and Ce 0.5 Zr 0.5 O 2 , respectively, is the characteristic peak of CeO 2 . 68 The presence of characteristic peaks of C-O and CH 2 -O stretching in the PEG-coated samples confirmed the formation of PEG coating, and it was also reported by Karakoti et al .…”

Section: Resultsmentioning

confidence: 96%

Enhanced Antioxidant Ability of PEG-Coated Ce_0.5Zr_0.5O₂-Based Nanofluids for Scavenging Hydroxyl Radicals

Rai

Kanagaraj

2022

ACS Omega

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The antioxidant therapy to preserve residual hearing is relatively recent, and the search for effective antioxidants is still ongoing. Though nanoceria has shown promising radical-scavenging capability, improving its antioxidant ability and the dispersion stability of its nanofluid, which is critical to the desired site, i.e., cochlea, still remains a major challenge. The objective of the present work is to study the radical-scavenging capability of poly(ethylene glycol) (PEG)-coated CeO 2 and Ce 0.5 Zr 0.5 O 2 nanoparticles in water and the biologically relevant fluid (PBS buffer). Nanoparticles in the size range of 4.0–9.0 nm are synthesized using the coprecipitation method and characterized using suitable techniques. The scavenging and dispersion stability of the synthesized nanofluid are analyzed using a UV–vis spectrophotometer. It is found that the addition of PEG during the synthesis process promoted the generation of finer nanoparticles with a narrow size distribution and the doping of zirconium produced a large number of defects in the crystallite structure. The PEG coating over the nanoparticles improved the dispersion stability of nanofluids without affecting their surface reactivity, and it is found to be 94 and 80% in water and PBS, respectively, at 500 μM and 60 min, which is maintained till 90 min. The highest scavenging of hydroxyl radicals by PEG-coated Ce 0.5 Zr 0.5 O 2 is found to be 60%, which is significantly superior to that of CeO 2 . The scavenging capability is found to be increased with the concentration of nanoparticles, showing the best scavenging activity at 190 and 150 μM for PEG-coated CeO 2 and Ce 0.5 Zr 0.5 O 2 , respectively, and the scavenging in water is at par with that of PBS, indicating that these nanoparticles are suitable to be used in sites where a biologically relevant fluid is present, e.g., the cochlea. It is proposed that PEG-coated Ce 0.5 Zr 0.5 O 2 having an average size of ∼ 4 nm can be a potential antioxidant in relevant biomedical applications.

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The influence of H2O2 on the properties of CeO2-ZrO2 mixed oxides

Cited by 22 publications

References 44 publications

Iron- and Cobalt-Doped Ceria–Zirconia Nanocomposites for Catalytic Cracking of Naphtha with Regenerative Capability

Iron- and Cobalt-Doped Ceria–Zirconia Nanocomposites for Catalytic Cracking of Naphtha with Regenerative Capability

Role of Two-Electron Defects on the CeO₂ Surface in CO Preferential Oxidation over CuO/CeO₂ Catalysts

Enhanced Antioxidant Ability of PEG-Coated Ce_0.5Zr_0.5O₂-Based Nanofluids for Scavenging Hydroxyl Radicals

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The influence of H2O2 on the properties of CeO2-ZrO2 mixed oxides

Cited by 22 publications

References 44 publications

Iron- and Cobalt-Doped Ceria–Zirconia Nanocomposites for Catalytic Cracking of Naphtha with Regenerative Capability

Iron- and Cobalt-Doped Ceria–Zirconia Nanocomposites for Catalytic Cracking of Naphtha with Regenerative Capability

Role of Two-Electron Defects on the CeO2 Surface in CO Preferential Oxidation over CuO/CeO2 Catalysts

Enhanced Antioxidant Ability of PEG-Coated Ce0.5Zr0.5O2-Based Nanofluids for Scavenging Hydroxyl Radicals

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Product

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Role of Two-Electron Defects on the CeO₂ Surface in CO Preferential Oxidation over CuO/CeO₂ Catalysts

Enhanced Antioxidant Ability of PEG-Coated Ce_0.5Zr_0.5O₂-Based Nanofluids for Scavenging Hydroxyl Radicals