Modifying defect States in CeO2 by Fe doping: A strategy for low-temperature catalytic oxidation of toluene with sunlight

Jiang, Chunli; Wang, Hao; Wang, Yongqing; Xue, Can; Yang, Zujin; Yu, Changlin; Ji, Hongbing

doi:10.1016/j.jhazmat.2020.122182

Cited by 69 publications

(26 citation statements)

References 44 publications

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“…36 Jiang et al also found that the introduction of Fe into the CeO 2 lattice would produce lattice distortion and activate oxygen species, promoting the compensation of oxygen during the oxidation process. 37 Therefore, from the perspective of low cost and high efficiency, it appears reasonable to load a certain amount of CeO 2 onto Fe 2 O 3 to maximize the synergistic effect of CeO 2 and Fe 2 O 3 , improving the catalytic performance for toluene oxidation at low temperature.…”

Section: ■ Introductionmentioning

confidence: 99%

Flower-like Pt/Fe₂O₃–CeO₂ Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Zhou

Chen

et al. 2021

Ind. Eng. Chem. Res.

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A series of porous Pt/Fe x Ce y microflowers have been synthesized through a solvothermal method. The well-defined mesoporous structure promotes gas distribution as well as even dispersion of active species, thus exposing more active sites and improving the catalytic efficiency for low-temperature toluene removal. The catalyst composition can be regulated by changing the Fe/Ce molar ratio and Pt loading content. Among the samples, 1 wt % Pt/Fe3Ce1 performed the best, with a reaction temperature for 90% toluene conversion of 192 °C at a WHSV of 36,000 mL/(h·g). The synergistic effect of Fe2O3 and CeO2 promotes electron transfer and migration of oxygen species. Addition of Pt enhances the mobility of lattice oxygen, generating a high concentration of active surface lattice oxygen, which facilitates toluene removal. The Mars–van Krevelen model could be applied to explain the mechanism of toluene oxidation over these Fe-based catalysts.

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Section: ■ Introductionmentioning

confidence: 99%

Flower-like Pt/Fe₂O₃–CeO₂ Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Zhou

Chen

et al. 2021

Ind. Eng. Chem. Res.

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“…Previous research finds that the good low temperature reducibility and Ce 3+ species are highly in relation to the formation of oxygen vacancies, that is to say, more Ce 3+ species and better reducibility always means more oxygen vacancies are generated. [54] Moreover, oxygen vacancies are also recognized as the effective sites for the highly reactive O ads species adsorption, in other words, the amount of oxygen vacancies reflects the concentration of O ads. [55] The results of H clarifies that the doping of Ce strongly enhances the reducibility of Ce x CoO catalysts, which facilitate the adsorption of O ads species.…”

Section: Discussionmentioning

confidence: 99%

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

Liu

Fan

Song

2020

Applied Organom Chemis

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Cobalt-based catalyst, as a typical catalyst for volatile organic compounds (VOCs) combustion, has attracted extensive attention. However, the catalytic activity of pure Co 3 O 4 is difficult to meet the requirements of practical application especially at low temperatures. Therefore, it is key to find an effective way to improve the catalytic performance of Co 3 O 4. In this paper, Co 3 O 4 is modified by engineering a combination of structural template and Ce dopant. The various characterization results verify that the template agent and the doping of appropriate Ce lead to great changes in the texture property and low temperature reducibility of Co 3 O 4 , thus resulting in superior catalytic performances of obtained mesoporous Ce x CoO catalysts. In particular, the best catalyst, Ce 0.05 CoO, achieves a toluene conversion of T 90% at 238 C, which is significantly lower than many of the Co-based catalysts reported in previous literatures. Furthermore, the toluene conversion rate maintains above 90% during 100 h at 238 C. The excellent catalytic performance of Ce 0.05 CoO can be attributed to its large specific surface area, uniform pore structure, good low temperature reducibility, and abundant surface oxygen species.

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“…The CeO 2 nanorod (CeO 2 NR) with 15% Fe 3+ iron doping is the highest. [ 25 ] This method has received increasing attention for characterizing defects in CeO 2 . [ 26 ] Prior to this, there were also researchers who divided the peak of O 1 s , determining the species of oxygen by the band energy at a particular location.…”

Section: Characterization Of Defectsmentioning

confidence: 99%

“…The EPR test in Figure 3b shows the resonance response signal of unpaired electrons in an applied magnetic field. It was verified by Jiang and his team that the symmetrical signals Fe 0.15 Ce NRs (1.965) present more strongly than CeO 2 (1.94), [ 25 ] which manifests a higher unpaired electron capture capability at oxygen defects in different positions. [ 28 ]…”

Section: Characterization Of Defectsmentioning

confidence: 99%

“…Transition metal doping, such as Fe, Co, Ni, Mn, W, and Zn, are also considered as an excellent choice to introduce oxygen defects. [ 25,30,32,43 ] Zhao and his team successfully fabricated a solid solution structure of transition metals such as Fe, Co, and Ni. By the XPS test shown in Figure 5c, the Co/CeO 2 samples showed more Ce 3+ and oxygen vacancies than that of CeO 2 and other Co/CeO 2 .…”

Section: Strategies For Introducing Defectsmentioning

confidence: 99%

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Defect Engineering on CeO₂‐Based Catalysts for Heterogeneous Catalytic Applications

et al. 2021

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With abundant crystal defects, cerium oxide (CeO2), widely used in heterogeneous catalysis, has attracted extensive attention. In recent years, researchers have investigated that the defect chemistry of CeO2 plays a vital role in its catalytic activity and have developed various defect introduction methods to synthesize stable and efficient defective CeO2‐based catalysts. Herein, the understanding, introduction, and applications of defect chemistry in CeO2‐based heterogeneous catalysis are reviewed, and the structure–activity relationship between defect engineering and catalytic performance is recommended with great emphasis. Interests are put into the investigation of how defects influence the activity and stability of defective CeO2 catalysts and effective strategies for fabricating efficient, stable, and defective CeO2 catalysts. Finally, the existing problems and perspectives of CeO2 defect chemistry for heterogeneous catalysis are displayed. This review provides a reference for in‐depth understanding and the design of more efficient CeO2‐based catalysts for heterogeneous catalysis.

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Modifying defect States in CeO2 by Fe doping: A strategy for low-temperature catalytic oxidation of toluene with sunlight

Cited by 69 publications

References 44 publications

Flower-like Pt/Fe₂O₃–CeO₂ Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Flower-like Pt/Fe₂O₃–CeO₂ Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

Defect Engineering on CeO₂‐Based Catalysts for Heterogeneous Catalytic Applications

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Modifying defect States in CeO2 by Fe doping: A strategy for low-temperature catalytic oxidation of toluene with sunlight

Cited by 69 publications

References 44 publications

Flower-like Pt/Fe2O3–CeO2 Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Flower-like Pt/Fe2O3–CeO2 Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Preparation of mesoporous CexCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

Defect Engineering on CeO2‐Based Catalysts for Heterogeneous Catalytic Applications

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Flower-like Pt/Fe₂O₃–CeO₂ Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Flower-like Pt/Fe₂O₃–CeO₂ Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

Defect Engineering on CeO₂‐Based Catalysts for Heterogeneous Catalytic Applications