Effect of preparation method on the oxygen vacancy concentration of CeO 2 -promoted Cu/γ-Al 2 O 3 catalysts for HTS reactions

Shim, Jae Oh; Na, Hyun Suk; Jha, Ajay; Jang, Won-Jun; Jeong, Dae-Woon; Nah, In Wook; Jeon, Bo-Young

doi:10.1016/j.cej.2016.08.030

Cited by 100 publications

(20 citation statements)

References 43 publications

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“…Meanwhile, to achieve charge balance, oxygen vacancies were introduced into the lattice during the process of valence transition from Ce 4+ to Ce 3+ . 65 As shown in Table 2 , the Ce/SBA-15-6 catalyst exhibited the highest Ce 3+ /Ce 4+ molar ratio of 0.69. However, with the addition of more HDMS, the molar ratio of Ce 3+ /Ce 4+ decreased to 0.62 for Ce/SBA-15-9.…”

Section: Resultsmentioning

confidence: 84%

Synthesis of dimethyl carbonate from CO₂ and methanol over a hydrophobic Ce/SBA-15 catalyst

Xuan

Wang

et al. 2018

RSC Adv.

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A series of Ce/SBA-15 catalysts with different degrees of hydrophobicities were prepared via a post-grafting method and used for the direct synthesis of dimethyl carbonate (DMC) from CO 2 and methanol. The Ce/ SBA-15-6 catalyst exhibited the highest DMC yield of 0.2%, which was close to the equilibrium value under the reaction conditions of 130 C, 12 h and 12 MPa. The catalysts were characterized via XRD, BET, FT-IR, solid-state 29 Si MAS NMR, CA, TEM, XPS and NH 3 /CO 2 -TPD; the results indicated that the hydrophobicity of the catalysts facilitated the creation of oxygen vacancies, which could act as Lewis acids to activate methanol. Higher amounts of moderate acid sites led to higher yields of DMC. In addition, the hydrophobicity of the catalysts could also reduce the adsorbed water on their surface and increase the DMC yield while shortening the reaction time.

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Section: Resultsmentioning

confidence: 84%

Synthesis of dimethyl carbonate from CO₂ and methanol over a hydrophobic Ce/SBA-15 catalyst

Xuan

Wang

et al. 2018

RSC Adv.

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“…Conversely, the bare CFP and pristine CB show insignificant activity toward the ORR during the battery discharge. Many reports have inferred that the CeO 2 often acts as an oxygen buffer that can store O 2 in an oxygen-rich condition and remove it in an oxygen-insufficient condition because of the Ce 4+ /Ce 3+ redox couple. ,− As a result, the presence of CeO 2 on the catalyst surface would easily transfer O 2 to the contiguous Cu–O active sites . During the redox process, these factors are helpful to the catalytic activity in accordance with the Mars–Krevelen redox mechanism .…”

Section: Resultsmentioning

confidence: 99%

CuO Nanoplatelets with Highly Dispersed Ce-Doping Derived from Intercalated Layered Double Hydroxides for Synergistically Enhanced Oxygen Reduction Reaction in Al–Air Batteries

Hong

Wang

2017

ACS Sustainable Chem. Eng.

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Development of highly efficient, low-cost, and durable electrocatalysts for the oxygen reduction reaction (ORR) is still a major obstacle that is preventing widespread commercialization of Al−air batteries. Herein, a cost-effective CuCe-layered double hydroxide (CuCe-LDH) was synthesized using a facile and scalable method of separate nucleation/growth steps, followed by an anion exchange process. The CuCe-LDH was successfully used as a precursor for the mass production of Ce-doped CuO nanoplatelets (Cu−Ce−O) as a Pt-free efficient electrocatalyst, which exhibited not only comparable electrocatalytic activity and durability in the ORR test but also a higher discharge voltage plateau when used in Al−air batteries compared to the benchmark Pt/C catalysts. A combination of structural characterizations and electrochemical analyses showed that the high ORR activity of the Cu−Ce−O catalyst was attributed to its high content of active species combined with their synergetic interactions. These results may provide an option for cost-effective production of ORR electrocatalysts at a large scale for practical applications of Al−air cathodes.

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“…However, the oxidation efficiency over Ce x Zr 1−x O 2 was unsatisfied at low temperature, caused by the insufficient generation of O 2 − at low temperature. 8 It is well known that doping with heteroatoms could promote the generation of O 2 − . Until now, doping with alkaline earth metals (Mg, Ca), 9,10 transition metals (Cu, Co), 11 and rare earth metals (La) 12 has been reported.…”

Section: ■ Introductionmentioning

confidence: 99%

“…As a representative mixed oxide, ceria-zirconia solid solution (Ce x Zr 1– x O 2 ) was abundantly applied for the oxidation process, , which was ascribed to its outstanding surface oxygen releasing and storage ability, and the surface formation of superoxide radical (O 2 – ) figured a significant role. However, the oxidation efficiency over Ce x Zr 1– x O 2 was unsatisfied at low temperature, caused by the insufficient generation of O 2 – at low temperature . It is well known that doping with heteroatoms could promote the generation of O 2 – .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Controllable N-Doped Ce_0.2Zr_0.8O₂ via O–N–O Bond with Robust NO Oxidation and Durability at Low Temperature

et al. 2020

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N-doped Ce0.2Zr0.8O2 catalysts for NO oxidation were successfully fabricated via NH3 treatment at high temperature, and the N doping amount could be controlled via adjusting the conditions of various NH3 concentrations and treatment times. The optimal 10N700-5 catalyst revealed the sensational oxidation efficiency at low temperature, which surpassed 50% at 180 °C and reached up to 82.82% at 270 °C. The excellent activity was ascribed to the numerous generations of O2 – and the accompanied vast formation of Cr6+, caused by N doping. N atoms were doped in Ce0.2Zr0.8O2 in the structure of Ce–O–N–O–Zr via the O–N–O bond between N and O. The analysis of affecting factors elucidated that cation ratios played a more significant role than the Brunauer–Emmett–Teller surface area, and Cr6+ ratios acted mostly. Additionally, the conceivable promotion mechanism by N doping for NO oxidation was examined via in situ DRIFTS. This work propelled denitration with the selective catalytic oxidation technique for industrial application and lent a novel perspective for the design of catalysts with satisfied oxidation efficiency at low temperature.

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Effect of preparation method on the oxygen vacancy concentration of CeO 2 -promoted Cu/γ-Al 2 O 3 catalysts for HTS reactions

Cited by 100 publications

References 43 publications

Synthesis of dimethyl carbonate from CO₂ and methanol over a hydrophobic Ce/SBA-15 catalyst

Synthesis of dimethyl carbonate from CO₂ and methanol over a hydrophobic Ce/SBA-15 catalyst

CuO Nanoplatelets with Highly Dispersed Ce-Doping Derived from Intercalated Layered Double Hydroxides for Synergistically Enhanced Oxygen Reduction Reaction in Al–Air Batteries

Fabrication of Controllable N-Doped Ce_0.2Zr_0.8O₂ via O–N–O Bond with Robust NO Oxidation and Durability at Low Temperature

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Effect of preparation method on the oxygen vacancy concentration of CeO 2 -promoted Cu/γ-Al 2 O 3 catalysts for HTS reactions

Cited by 100 publications

References 43 publications

Synthesis of dimethyl carbonate from CO2 and methanol over a hydrophobic Ce/SBA-15 catalyst

Synthesis of dimethyl carbonate from CO2 and methanol over a hydrophobic Ce/SBA-15 catalyst

CuO Nanoplatelets with Highly Dispersed Ce-Doping Derived from Intercalated Layered Double Hydroxides for Synergistically Enhanced Oxygen Reduction Reaction in Al–Air Batteries

Fabrication of Controllable N-Doped Ce0.2Zr0.8O2 via O–N–O Bond with Robust NO Oxidation and Durability at Low Temperature

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Product

Resources

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Synthesis of dimethyl carbonate from CO₂ and methanol over a hydrophobic Ce/SBA-15 catalyst

Synthesis of dimethyl carbonate from CO₂ and methanol over a hydrophobic Ce/SBA-15 catalyst

Fabrication of Controllable N-Doped Ce_0.2Zr_0.8O₂ via O–N–O Bond with Robust NO Oxidation and Durability at Low Temperature