Ce1–xLaxOy solid solution prepared from mixed rare earth chloride for soot oxidation

Han, Xue; Hao, He; Guo, Ronggui; Hu, Yunsheng; Jiang, Wenquan

doi:10.1016/s1002-0721(16)60066-2

Cited by 20 publications

(5 citation statements)

References 31 publications

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“…All T m data are shown in Table 3. The highest difference in T m , at approximately 26 • C, occurred between the Mn1 and Mn0 catalysts, and is similar to previous reports, where different doped perovskites were used [16,29,30]. In addition, the most effective catalyst tested in this study is that one doped with 1 wt % of Mn (Mn1), which lowered the catalytic combustion of soot to 591 • C. This result is comparable with different perovskites where the T m of soot combustion reached temperatures above 500 • C [9,22,31,32].…”

Section: Resultssupporting

confidence: 90%

Effect of Dopant Loading on the Structural and Catalytic Properties of Mn-Doped SrTiO3 Catalysts for Catalytic Soot Combustion

et al. 2018

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Soot particles have been associated with respiratory diseases and cancer. To decrease these emissions, perovskite-mixed oxides have been proposed due to their thermal stability and redox surface properties. In this work, SrTiO 3 doped with different amounts of Mn were synthesized by the hydrothermal method and tested for soot combustion. Results show that at low Mn content, structural distortion, and higher O ads /O lat ratio were observed which was attributed to the high content of Mn 3+ in Ti sites. On the other hand, increasing the Mn content led to surface segregation of manganese oxide. All synthesized catalysts showed mesopores in the range of 32-47 nm. In the catalytic combustion of soot, the samples synthesized in this work lowered the combustion temperature by more than 100 • C compared with the uncatalyzed reaction. The sample doped with 1 wt % of Mn showed the best catalytic activity. The activation energy of these samples was also calculated, and the order of decreasing activation energy is as follows: uncatalyzed > Mn0 > Mn8 > Mn4 > Mn1. The best catalytic activity for Mn1 was attributed to its physicochemical properties and the mobility of the oxygen from the bulk to the surface at temperatures higher than 500 • C.

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Section: Resultssupporting

confidence: 90%

Effect of Dopant Loading on the Structural and Catalytic Properties of Mn-Doped SrTiO3 Catalysts for Catalytic Soot Combustion

et al. 2018

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“…Furthermore, out of all the catalysts prepared, LBC2 gave the best catalytic performance with a T 50 of 490 8C indicating that the reactivity of the surface oxygen was higher in the LBC2 catalyst than in the other prepared catalysts. Several literature reviews have reported that the high catalytic activity of perovskite and ceria based catalysts are as a result of the presence of oxygen species and not because of the various reactants such as soot, carbon monoxide, propane or methane [21,28,29]. Therefore with all the above explanations, we can argue that in this study, the oxygen species in the catalyst is what is responsible for the catalytic activities of the catalyst.…”

Section: Resultsmentioning

confidence: 52%

Synthesis, characterization and catalytic activity of partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) nano catalysts for potential soot oxidation in diesel particulate filters in diesel engines

Akinlolu

Omolara

Shailendra

et al. 2020

International Review of Applied Sciences and Engineering

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The sol gel method was used in preparing a series of A site partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) perovskite catalysts coded LBC1, 2, 3, and 4 and their potential as catalysts for soot oxidation were evaluated. The Brunauer–Emmett–Teller (BET), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES), Thermogravimetric/Differential Thermal Analysis (TGA/DTG), X-ray analysis (XRD) were used in characterizing the prepared perovskite catalyst. The result shows that at (x≥ 0.2 ≤ 0.4), there was an increase in surface area when we compare it with that of x = 0. The increase in surface area helps in increasing the catalytic performance of the catalyst. Also, when evaluating the catalytic performance of the synthesized catalysts, it was observed that doping the perovskite catalysts helped in the general improvement of the catalytic performance for soot oxidation. The best performance in this research study with a T50 of 484 °C was observed at x = 0.2 catalyst (LBC2). This shows that the non-noble perovskite catalysts prepared in this research study has the potential to replace the noble metal based catalysts used presently in the diesel automotive industry.

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“…In general, doping of other transition metals in the lattice of ceria was believed to be an effective strategy for improvement of the catalytic activity and thermal stability. For instance, doping of Zr 4+ , Co x+ , La 3+ , Cu 2+ , or Mn x+ was found to be able to boost formation of more oxygen vacancies, accelerate the transfer of active oxygen, or strengthen the interaction between metals, which can further improve the low-temperature activity and thermal stability in soot combustion. ,− One of the examples is the work by Zou et al, who reported that the Co 0.93 Ce 0.07 catalyst exhibited an excellent activity for soot oxidation under similar evaluation conditions and at tight contact mode . Nevertheless, for the previous studies reported in the literature, the catalytic performance of CeO 2 -based catalysts had not been improved too much at loose contact mode for most of the dopants.…”

Section: Introductionmentioning

confidence: 99%

Bi-Doped Ceria as a Highly Efficient Catalyst for Soot Combustion: Improved Mobility of Lattice Oxygen in Ce_xBi_1–xO_y Catalysts

Cui

et al. 2020

Energy Fuels

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Doping bismuth ions in the lattice of ceria was found to be an effective method for improvement of the catalytic performance. Herein, a series of Ce x Bi1–x O y (x = 0, 0.25, 0.5, and 0.75) catalysts was synthesized by the reverse coprecipitation method, and their catalytic activities were evaluated at both loose and tight contact modes. It was found that doping of Bi in the CeO2 lattice significantly improved the mobility of lattice oxygen in Ce x Bi1–x O y catalysts, and Ce0.5Bi0.5O y demonstrated the best catalytic performance, especially at loose contact mode. The activation energy of soot combustion for Ce0.5Bi0.5O y was determined to be 133 kJ mol–1. The impact of Bi doping on the low-temperature activity of Ce x Bi1–x O y catalysts was also examined. It was found that the lattice oxygen of unstable Bi–O–Ce species was easier to transfer to the catalyst surface and react with soot at high temperatures. The cyclic tests of catalysts demonstrated that Ce0.5Bi0.5O y could maintain a decent thermal stability. Overall, this study discovered the importance of lattice oxygen in soot combustion for the doped catalysts, which is of great significance for their future applications.

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Ce1–xLaxOy solid solution prepared from mixed rare earth chloride for soot oxidation

Cited by 20 publications

References 31 publications

Effect of Dopant Loading on the Structural and Catalytic Properties of Mn-Doped SrTiO3 Catalysts for Catalytic Soot Combustion

Effect of Dopant Loading on the Structural and Catalytic Properties of Mn-Doped SrTiO3 Catalysts for Catalytic Soot Combustion

Synthesis, characterization and catalytic activity of partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) nano catalysts for potential soot oxidation in diesel particulate filters in diesel engines

Bi-Doped Ceria as a Highly Efficient Catalyst for Soot Combustion: Improved Mobility of Lattice Oxygen in Ce_xBi_1–xO_y Catalysts

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Ce1–xLaxOy solid solution prepared from mixed rare earth chloride for soot oxidation

Cited by 20 publications

References 31 publications

Effect of Dopant Loading on the Structural and Catalytic Properties of Mn-Doped SrTiO3 Catalysts for Catalytic Soot Combustion

Effect of Dopant Loading on the Structural and Catalytic Properties of Mn-Doped SrTiO3 Catalysts for Catalytic Soot Combustion

Synthesis, characterization and catalytic activity of partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) nano catalysts for potential soot oxidation in diesel particulate filters in diesel engines

Bi-Doped Ceria as a Highly Efficient Catalyst for Soot Combustion: Improved Mobility of Lattice Oxygen in CexBi1–xOy Catalysts

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Bi-Doped Ceria as a Highly Efficient Catalyst for Soot Combustion: Improved Mobility of Lattice Oxygen in Ce_xBi_1–xO_y Catalysts