Controlled synthesis of CeO2 nanorods and their promotional effect on catalytic activity and aging resistibility for diesel soot oxidation

Chen, Zhi; Chen, Liuling; Jiang, Man; Gao, Xingyue; Huang, Mao Lin; Li, Yunxiang; Ren, Liping; Yang, Yan; Yang, Zhengzheng

doi:10.1016/j.apsusc.2020.145401

Cited by 36 publications

(9 citation statements)

References 57 publications

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“…The length of these bar-like CeMOF ranged from sub-micrometer to a few micrometers with relatively high aspect ratios and smooth surfaces. The crystalline structure of this CeMOF could also be indexed to the reported XRD pattern of this CeMOF (i.e., CeBTC [30]), indicating that the coordination of Ce 3+ and BTC can afford the bar-like morphology of MOF.…”

Section: Characterization Of Ceonbmentioning

confidence: 76%

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

et al. 2021

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As CeO2 is a useful catalyst for soot elimination, it is important to develop CeO2 with higher contact areas, and reactivities for efficient soot oxidation and catalytic soot oxidation are basically controlled by structures and surface properties of catalysts. Herein, a Ce-Metal organic framework (MOFs) consisting of Ce and benzene-1,3,5-tricarboxylic acid (H3BTC) is employed as the precursor as CeBTC exhibits a unique bar-like high-aspect-ratio morphology, which is then transformed into CeO2 with a nanoscale bar-like configuration. More importantly, this CeO2 nanobar (CeONB) possesses porou, and even hollow structures, as well as more oxygen vacancies, enabling CeONB to become a promising catalyst for soot oxidation. Thus, CeONB shows a much higher catalytic activity than commercial CeO2 nanoparticle (comCeO) for soot oxidation with a significantly lower ignition temperature (Tig). Moreover, while soot oxidation by comCeO leads to production of CO together with CO2, CeONB can completely convert soot to CO2. The tight contact mode also enables CeONB to exhibit a very low Tig of 310 °C, whereas the existence of NO also enhances the soot oxidation by CeONB to reduce the Tig. The mechanism of NO-assisted soot oxidation is also examined, and validated by DRIFTS to identify the formation and transformation of nitrogen-containing intermediates. CeONB is also recyclable over many consecutive cycles and maintained its high catalytic activity for soot oxidation. These results demonstrate that CeONB is a promising and easily prepared high-aspect-ratio Ce-based catalyst for soot oxidation.

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Section: Characterization Of Ceonbmentioning

confidence: 76%

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

et al. 2021

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“…It has been reported in many literatures that the good redox properties of catalysts have a positive effect on the soot catalytic combustion 20 , 38 . In general, the mutual doping of MnO x and CeO 2 can improve the redox performance of a single oxide 31 , 39 .…”

Section: Resultsmentioning

confidence: 99%

Effect of oxygen vacancy and highly dispersed MnOx on soot combustion in cerium manganese catalyst

Zhu

Chen

et al. 2023

Sci Rep

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Cerium manganese bimetallic catalysts have become the focus of current research because of their excellent catalytic performance for soot combustion. Two series of cerium manganese catalysts (Na-free catalysts and Na-containing catalysts) were prepared by coprecipitation method and characterized using XRD, N2 adsorption–desorption, SEM, Raman, XPS, H2-TPR, O2-TPD, Soot-TPR-MS and in situ IR. The effects of abundant oxygen vacancies and surface highly dispersed MnOx on soot catalytic combustion of cerium manganese catalysts prepared by different precipitants were analyzed. The activity test results show that the active oxygen species released by a large number of oxygen vacancies in the cerium manganese catalyst are more favorable to the soot catalytic combustion than MnOx which is highly dispersed on the surface of the catalyst and has good redox performance at low temperature. Because the catalytic effect of MnOx on the surface of Na-free catalysts is more dependent on the contact condition between the catalyst and the soot, this phenomenon can be observed more easily under the loose contact condition than under the tight contact condition. The activity cycle test results show that these two series of catalysts show good stability and repeated use will hardly cause any deactivation of the catalysts.

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“…Since oxygen vacancy can play a key role in the activation of gaseous oxygen to form active oxygen species, the extra oxygen vacancies created from NaBH 4 etching could accelerate oxygen activation and finally promote the catalytic CO oxidation performance compared to the untreated catalysts. [40,41] The B 1s spectra for the treated CeO 2 NR supports are shown in Figure 5c. It is obvious that only the 3 and 6 wt % NaBH 4 À CeO 2 NR samples have detected B species on surface.…”

Section: Chemical and Catalytic Propertiesmentioning

confidence: 99%

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

2020

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In this report, CeO2 nanorods (CeO2NR) were first chemically etched by different amounts (0.6, 3 and 6 wt %) of NaBH4, which were employed to understand the etching effect on the support structure, surface defects, and reducibility of modified CeO2NR supports. The 6 wt % NaBH4 etched CeO2NR was further used as support materials to load transition‐metals (TM: Cu, Co, Ni, Fe and Mn) catalysts, in order to investigate the support etching effect on the reducibility and catalytic performance of CeO2NR supported TM catalysts. In comparison with the catalytic performance of CeO2NR supported TM catalysts in literature, the 6 wt % NaBH4 etched CeO2NR supported catalysts show clearly enhanced CO oxidation performance at lower temperature, which is mainly attributed to the created surface defects by boron doped CeO2 surface during NaBH4 chemical etching and strong metal‐support interaction.

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Controlled synthesis of CeO2 nanorods and their promotional effect on catalytic activity and aging resistibility for diesel soot oxidation

Cited by 36 publications

References 57 publications

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

Effect of oxygen vacancy and highly dispersed MnOx on soot combustion in cerium manganese catalyst

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

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Controlled synthesis of CeO2 nanorods and their promotional effect on catalytic activity and aging resistibility for diesel soot oxidation

Cited by 36 publications

References 57 publications

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

Effect of oxygen vacancy and highly dispersed MnOx on soot combustion in cerium manganese catalyst

NaBH4 Surface Modification on CeO2 Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

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NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation