Catalytic soot combustion of α-Fe/Ce–K–O nanocomposites via citrate-gel route

He, Fenglin; Meng, Xiaoxiao; Shen, Xiangqian; Xiang, Jun; Wang, Pan

doi:10.1007/s10971-011-2658-6

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…Detailed data used for the compilation of Figure are reported in the Table , Table , and Table S1 in the Supporting Information. Depending on their chemical composition and morphology, the catalysts were divided into six groups: platinum metal group, ,− ceria–zirconia-based, − ,,,,,,,,,,− alkali-nanostructured, ,,,,− ,,,,,,,,− ,− spinel structure, ,,,,− ,,,− perovskite structure, ,,,,,,,,,…”

Section: Reactivity Of Alkali-containing Soot Combustion Catalystsmentioning

confidence: 99%

Catalytic Soot Combustion─General Concepts and Alkali Promotion

Legutko

Stelmachowski

et al. 2023

ACS Catal.

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In this Review, we discuss catalytic systems for soot combustion. The focus is on alkali-containing materials since they exhibit the most promising and platinum group metal (PGM) free solutions, providing highly efficient catalysts at a low price. The wide range of experimental conditions used for catalyst evaluation and parameters commonly used to compare different materials was scrutinized. The presented synthetic summary of the classical and long-researched materials reveals that the most active catalysts, which may fulfill the low-temperature activity apart from PGM-based systems, are only those containing alkalis as beneficial dopants. The alkali promotion by surface doping or nanostructuration of earth abundant transition metal oxides emerged as an effective way to develop effective soot oxidation catalytic materials; therefore, the physical nature of alkali promotion is thoroughly discussed. A detailed presentation of the state of the art three-dimensional macroporous materials is presented, as these catalysts combine beneficial catalytic activity with morphological features designed for enhancing the contact between the catalyst and the soot particles. Finally, a set of reactivity descriptors for the alkali-promoted catalysts (work function, alkali desorption energy, and oxygen availability) was proposed to foster the rational design of catalytic materials for soot oxidation.

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Section: Reactivity Of Alkali-containing Soot Combustion Catalystsmentioning

confidence: 99%

Catalytic Soot Combustion─General Concepts and Alkali Promotion

Legutko

Stelmachowski

et al. 2023

ACS Catal.

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“…3, all the nanocomposites exhibit a high catalytic activity compared to the none-catalyst. The T 50 values for Cu-, Co-, Ni-nanocomposites are 315 °C, 357 °C, 388 °C, respectively, which are much lower than that for the pure Ce-K-O (T 50 =394 °C) [7], implying the transition metal nanoparticles could improve the catalytic activity for soot combustion. Moreover, the Cu/Ce-K-O catalyst with the lowest T 50 (315 °C) presents the best catalytic activity for soot combustion at low temperatures in comparison with Co/Ce-K-O, Ni/Ce-K-O and xFe/(1-x)Ce-K-O(x=0.1, T 50 =341 °C) [7], which is also lower compared to 350 °C for the perovskite La 0.8 K 0.2 FeO 3 [11] and 380 °C for the Cu-doped CeO 2 prepared by citric acid sol-gel method [12].…”

Section: Resultsmentioning

confidence: 89%

“…Catalyst preparation. The catalysts M/Ce-K-O (M=Co, Ni, Cu) were prepared by the citrate-gel thermal decomposition and selective reduction process, which was described in detail in our previous work [7]. The reagents used were analytic grade of Ce(NO 3…”

Section: Methodsmentioning

confidence: 99%

“…Though various ceria-based catalysts have been investigated for soot combustion, there are rare reports about binary nanocomposites of CeO 2 supported transition metal nanoparticles. Based on our previous work of α-Fe/CeO 2 nanocomposite [7], this work reports the preparation, microstructure and catalytic comparison of M/Ce-K-O (M=Co, Ni, Cu) nanocomposites for soot combustion.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Comparison of M/Ce-K-O (M=Co, Ni, Cu) Nanocomposites on Catalytic Soot Combustion

Feng

Jing

Meng

et al. 2013

AMR

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Porous nanocomposites of M/Ce-K-O (M=Co, Ni, Cu) were prepared by the citrate-gel thermal decomposition and selective reduction process, and the effect of transition metal nanoparticles on their microstructure, catalytic performance were studied by XRD, SEM, BET, XPS and TG analysis. The nanocomposites consist of the fluorite-type matrix of CeO2 nanoparticles about 13-20 nm and metallic nanoparticles ~26 nm. These nanocomposites have a nanoporous structure with high specific surface area and their pore sizes, pore structures, surface morphologies are largely affected by the dispersed nano metal species. For M/Ce-K-O (M=Co, Ni, Cu) nanocomposites, all the catalysts show a high catalytic activity for soot combustion, and among them, the Cu/Ce-K-O nanocomposite has a lowest T50 of 315 °C mainly due to a higher lattice oxygen content and a weaker Cu-O interaction intensity.

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High Surface Area Ceria for CO Oxidation Prepared from Cerium t-Butoxide by Combined Sol–Gel and Solvothermal Processing

Yang

Lukashuk

et al. 2013

Catal Lett

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CeO2 was synthesized by combined sol–gel and solvothermal processing of gels obtained from acetaldoximate-modified cerium(IV) t-butoxide in the presence of the non-ionic surfactant Pluronic F127. The use of cerium(IV) t-butoxide as precursor contrasts very favorably with the often used ceric ammonium nitrate and results in more reliable and tailorable properties of the final materials. The kind of post-synthesis treatment of the gels and the composition of the precursor mixture proved to be crucial for obtaining high surface area ceria with a high Ce3+ proportion. Calcination in air or under nitrogen was compared with solvothermal treatment in ethanol or water and a combination of solvothermal treatment and calcination. The obtained materials are composed of 3.5–5.5 nm ceria nanoparticles. The highest specific surface area of 277 m2/g was obtained after solvothermal treatment, and 180 m2/g when solvothermal treatment was followed by calcination in air to remove residual organic groups. The highest Ce3+ proportion was 18 % after solvothermal treatment in ethanol and additional calcination in air. CO oxidation on selected samples indicated that activity scaled with surface area and thus was largest for samples solvothermally treated in ethanol. The reaction rate of the best sample was about 75-times larger than that of commercial ceria.Graphical Abstract.

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Catalytic soot combustion of α-Fe/Ce–K–O nanocomposites via citrate-gel route

Cited by 5 publications

References 30 publications

Catalytic Soot Combustion─General Concepts and Alkali Promotion

Catalytic Soot Combustion─General Concepts and Alkali Promotion

Preparation and Comparison of M/Ce-K-O (M=Co, Ni, Cu) Nanocomposites on Catalytic Soot Combustion

High Surface Area Ceria for CO Oxidation Prepared from Cerium t-Butoxide by Combined Sol–Gel and Solvothermal Processing

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