Synthesis of CeO2 and Zr-Doped CeO2 (Ce1−xZrxO2) Catalyst by Green Synthesis for Soot Oxidation Activity

Mishra, Upendra Kumar; Chandel, Vishal Singh; Singh, Om Prakash; Alam, Navshad

doi:10.1007/s13369-022-06997-x

Cited by 15 publications

(4 citation statements)

References 33 publications

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“…Equation (12) indicates that the rate of CB oxidation over HSiW/CeO 2 was primarily influenced by the concentrations of surface-adsorbed CB, Ce 4+ ions, lattice oxygen species, gaseous CB, and surface-adsorbed oxygen species. However, the concentration of gaseous CB was generally not affected by NH 3 .…”

Section: Inhibition Mechanism Of Nh 3 On Cb Oxidationmentioning

confidence: 99%

“…The catalyst used to remove NO x and Cl-VOCs should possess excellent surface acidity and redox properties. Ce-based oxides generally have prominent oxygen mobility, high oxygen storage and release capacity, and even some acidic properties [12], which have been widely utilized in the reduction of NO x and the catalytic oxidation of Cl-VOCs. Further research conducted by Zhang et al revealed that Ce-Ti amorphous oxide demonstrated remarkable SCR activity across a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Oxidation of Chlorobenzene over HSiW/CeO2 as a Co-Benefit of NOx Reduction: Remarkable Inhibition of Chlorobenzene Oxidation by NH3

Dong,

Jiang,

Shen

et al. 2024

Materials

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There is an urgent need to develop novel and high-performance catalysts for chlorinated volatile organic compound oxidation as a co-benefit of NOx. In this work, HSiW/CeO2 was used for chlorobenzene (CB) oxidation as a co-benefit of NOx reduction and the inhibition mechanism of NH3 was explored. CB oxidation over HSiW/CeO2 primarily followed the Mars–van–Krevelen mechanism and the Eley-Rideal mechanism, and the CB oxidation rate was influenced by the concentrations of surface adsorbed CB, Ce4+ ions, lattice oxygen species, gaseous CB, and surface adsorbed oxygen species. NH3 not only strongly inhibited CB adsorption onto HSiW/CeO2, but also noticeably decreased the amount of lattice oxygen species; hence, NH3 had a detrimental effect on the Mars–van–Krevelen mechanism. Meanwhile, NH3 caused a decrease in the amount of oxygen species adsorbed on HSiW/CeO2, which hindered the Eley-Rideal mechanism of CB oxidation. Hence, NH3 significantly hindered CB oxidation over HSiW/CeO2. This suggests that the removal of NOx and CB over this catalyst operated more like a two-stage process rather than a synergistic one. Therefore, to achieve simultaneous NOx and CB removal, it would be more meaningful to focus on improving the performances of HSiW/CeO2 for NOx reduction and CB oxidation separately.

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Section: Inhibition Mechanism Of Nh 3 On Cb Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of Chlorobenzene over HSiW/CeO2 as a Co-Benefit of NOx Reduction: Remarkable Inhibition of Chlorobenzene Oxidation by NH3

Dong,

Jiang,

Shen

et al. 2024

Materials

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“…The Williamson Hall plan has revealed the strain in the materials. Table 3 shows the microstrain of the samples based on the slope of 4sin𝜃 and 𝛽cos𝜃 values (11)(12)(13) . At 5% Fe doping, the sample exhibits large increase in the micro strain which further slightly increases.…”

Section: X-ray Diffractionmentioning

confidence: 99%

FTIR Spectroscopy and Microstructural Study of Fe Doped Calcium Copper Titanate (CCTO)

Tripathi,

Srivastava,

Chandel

et al. 2024

IJST

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Objectives : The analysis of present material is to reveal the effect of Fe atom by replacing the Ti atom in CCTO for chemical properties. Methods: Pure and Fe doped CaCu3Ti4-xFexO12 (x=0.05, 0.10, and 0.15) CCTO ceramics were synthesized by solid-state reaction route and calcination was done at 930°C for 12 hrs with heating rate of 4°C/min. The phase structure of samples was confirmed by X-ray Diffraction (XRD) and found single phase calcium copper titanate. Morphology of all samples was investigated by scanning electron microscopy. Absorption band have been also recorded for all samples. Findings: The structure remains cubic by doping of Fe atom in place of Ti atom. The average size of all the samples were lies between 1-1.3µm. Novelty: The bond strength becomes stronger as the doping of Fe atom takes place. The large absorption band is found in the range 380-700 cm-1. The peak of large band is shifted towards lower wave number. These higher wavelengths can be used in water pollutants. The increased volume size of samples shows lower energy band gap. This lower energy band gap enhanced the electrical properties. Keywords: FESEM, XRD, FTIR, EDS, CCTO

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“…Due to the importance of the redox property to a highly active CeO 2 -based catalyst, many attempts have been made to boost the ratio of Ce 3+ /Ce 4+ , enhancing the redox property of the catalyst and increasing the amount of oxygen vacancies (V O ) [17,[19][20][21][22][23]. Usually, heteroatoms such as Zr [24][25][26], Ti [27,28], Mn [29][30][31] and Sn [32][33][34][35][36][37] were doped into CeO 2 lattice-forming solid solutions to increase their redox properties. Among them, the materials incorporating Sn into CeO 2 have been applied in various fields, including sensors [37], solid-state films [38], electrode materials [39,40], biological applications [40,41] and catalysts [33,36,42,43].…”

Section: Introductionmentioning

confidence: 99%

Ce1−xSnxO2 Catalysts Prepared with Combustion Method for Catalytic Combustion of Ethyl Acetate

Jiang,

Wang,

et al. 2023

Catalysts

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A series of Ce1-XSnXO2 (X = 0, 0.2, 0.3, 0.4, 0.5, 0.9, 1) catalysts were synthesized via the combustion method. The physical and chemical structures of the prepared catalysts were systematically characterized by XRD, BET, SEM, TEM, XPS, and TPR. The Ce1-XSnXO2 catalysts have higher catalytic activities than the mono-oxide catalysts, as there are synergistic effects between CeO2 and SnO2. The catalytic activities of the Ce1−XSnXO2 catalysts are dependent on the X for the catalytic combustion of ethyl acetate (EA). The Ce1−XSnXO2 (X < 0.5) catalysts show high catalytic performances. Meanwhile, the Ce0.8Sn0.2O2 and Ce0.7Sn0.3O2 catalysts display the highest catalytic performance, with T50 = 190 °C and T90 = 210 °C. More importantly, the Ce0.8Sn0.2O2 catalyst exhibits superior thermal and catalytic activity stability. It is found that the Ce1-XSnXO2 catalysts form solid solutions, as the X is <0.5. The reduction of Sn4+ species to Sn2+ is significantly promoted by the CeO2, which is an important factor attributed to the high catalytic activities of the solid solution Ce1−XSnXO2 catalysts. The catalytic activities of the Ce1-XSnXO2 catalysts exhibit a strong correlation to the surface atomic areas of Ce3+ and Oα (VO). In other words, the higher surface atomic areas of Ce3+ and Oα (VO) are, the higher the catalytic activities will have.

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Synthesis of CeO2 and Zr-Doped CeO2 (Ce1−xZrxO2) Catalyst by Green Synthesis for Soot Oxidation Activity

Cited by 15 publications

References 33 publications

Catalytic Oxidation of Chlorobenzene over HSiW/CeO2 as a Co-Benefit of NOx Reduction: Remarkable Inhibition of Chlorobenzene Oxidation by NH3

Catalytic Oxidation of Chlorobenzene over HSiW/CeO2 as a Co-Benefit of NOx Reduction: Remarkable Inhibition of Chlorobenzene Oxidation by NH3

FTIR Spectroscopy and Microstructural Study of Fe Doped Calcium Copper Titanate (CCTO)

Ce1−xSnxO2 Catalysts Prepared with Combustion Method for Catalytic Combustion of Ethyl Acetate

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