Catalysts of self-assembled Pt@CeO2−δ-rich core–shell nanoparticles on 3D ordered macroporous Ce1−xZrxO2for soot oxidation: nanostructure-dependent catalytic activity

Wei, Yuechang; Jiao, Jinqing; Zhang, Xindong; Jin, Baofang; Zhang, Zhao; Xiong, Jing; Li, Yazhao; Liu, Jian; Li, Jianmei

doi:10.1039/c7nr00326a

Cited by 61 publications

(36 citation statements)

References 58 publications

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“…We list the ignition temperature (T i ) (or temperature at 10% of soot conversion (T 10 )) and the temperature of the max oxidation rate (T o ) (or temperature at 50% of soot conversion (T 50 )) of these catalysts in Table 4. Compared to these data from Table 4, Pt [43], Au [44], and Cu [45] doped in a catalyst all have an excellent performance. Among them, Au-doped catalyst has the best effect, but the high cost limits it's widely applications.…”

Section: Analysis Of Catalytic Performancementioning

confidence: 91%

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Zhang

Wang

et al. 2019

Catalysts

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Cerium-zirconium (Ce-Zr) solid solutions have been extensively used in a wide variety of catalytic processes due to their unique catalytic features in conjunction with lower cost compared to noble metal-based systems. A series of Ce-Zr-based catalysts was prepared by the sol-gel method. The structure and morphology of these catalysts were characterized by X-ray diffraction, thermogravimetric-differential scanning calorimetry, scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. Furthermore, investigation on catalytic performance was carried out by constructing a test platform, and the result indicated that the catalysts apparently decreased the soot ignition temperature. These catalysts exhibited higher catalytic activity for soot oxidation under narrow contact conditions. The results revealed that some soot particles could react with adsorbed oxygen, and other part of diesel soot reacted with lattice oxygen. The activity of these catalysts was attributed to synergistic effect arising from the combination of K/Co/Zr and Ce-Zr solid solution, which led to the decrease in the ignition temperature to 294 • C (data from the test platform). The catalyst still keeps good stability and catalytic activity after the cycle oxidation experiment. A reaction pathway was proposed to explain catalytic combustion process of soot, i.e., combination of K/Co/Zr with Ce-Zr solid solution reduced the binding energy of Ce-Zr solid solution, which was conducive to provide more active sites to release the active oxygen (O 2 − ) or lattice oxygen (O 2− ).Catalysts 2019, 9, 646 2 of 18 the filter becomes necessary. Soot burns at 500-600 • C under air conditions, while the diesel exhaust temperature is only 200-400 • C. Therefore, igniting soot combustion under these conditions requires catalytic oxidation. The filter should be able to trap and burn soot particles when it collects them, so that the filter does not saturate. A large number of catalysts has been investigated for controlling the exhaust emissions of diesel engines, and the main objective of most of these studies is to improve the catalytic performance for soot combustion. Numerous articles reporting the use of CeO 2 as an effective catalyst for soot combustion are available [11,12], and a mechanism has been proposed to explain these catalytic processes. The Ce 4+ /Ce 3+ redox cycle confers the ability to absorb gaseous O 2 , thus forming active oxygen at the catalyst surface (O ads ), which can be transferred to the soot catalyst interface by superficial diffusion. For this reason, properties of the Ce 4+ /Ce 3+ couple and the capacity of CeO 2 to exchange oxygen with the gas phase make CeO 2 -based materials one of the most promising catalysts for soot combustion [13,14]. They are widely known to favor the oxidation of soot by increasing the catalyst/soot contact with the high mobility of alkali metals or alkaline-earth metals [15][16][17][18][19][20]. Fan et al. studied the effect of Ba loading on Cu-Ce catalysts, and it was sh...

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Section: Analysis Of Catalytic Performancementioning

confidence: 91%

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Zhang

Wang

et al. 2019

Catalysts

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“…Therefore, great attention needs to be paid to the choice of host/support material. For instance, pores in zeolites are more tuneable than metal oxides, while metal oxides such as CeO 2 have an ability to move through phases, and are able to change their oxidation state to release electronic strain, and are thus suited to application in substituted materials [8][9][10][11][12][13][35][36][37][38]. The susceptibility of ceria to changed oxidation states allows for various metals to be substituted into the fluorite structure; however, this phenomena may indeed be the reason for leaching.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Substituted Ceria: An Alternative Approach to Ligand-Free Heck-Mizoroki Cross-Coupling Reactions

Vundla

Friedrich

2020

Catalysts

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This work describes Ce0.89Zr0.03Pd0.08O2-δ as a heterogeneous catalyst for Heck-Mizoroki reactions. The material was synthesised by urea-assisted solution combustion to give a zirconium-stabilised cerium fluorite structure, with a fraction of palladium incorporated into the host structure. Characterisation techniques included ICP-OES, P-XRD and electron microscopy. The catalyst illustrated a high TOF of 1860 h−1 for the cross-coupling of iodobenzene with methyl acrylate, when trimethylamine (TEA) was used as a base and dimethylformamide (DMF) as the solvent at 130 °C. To establish the activity of coupling pairs, screening was limited to aryliodobenzenes, with various electronic properties, to determine the influence of aryliodobenzene electronic density on the trans product yield. Electron-donating substituents showed good yields, while electron-withdrawing groups had lower yields. Furthermore, various classes of electron-deficient olefins were screened to determine any effect on the trans product yield. Electron-deficient olefins showed higher yields with regard to the trans product than neutral styrene.

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“…In catalysis fields, bimetallic oxide catalysts have attracted tremendous interest in fundamental studies and practical applications . For bimetallic oxide catalysts, it is recognized that the synergistic effect enables them to exhibit superior properties to those of their monometallic oxide counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…In catalysis fields,b imetallic oxide catalystsh ave attracted tremendousi nteresti nf undamentals tudiesa nd practical applications. [1][2][3][4][5] For bimetallic oxide catalysts, it is recognized that the synergistic effect enables them to exhibit superior properties to those of their monometallic oxide counterparts. Among them, typical examples are CeO 2 -based bimetallic oxide catalysts, for example, CeO 2 ÀMnO 2 ,w hich are widely studied in many reactions, such as CO oxidation, [6] selective catalytic reductiono fN O x with NH 3 , [7] and oxidation of volatile organic compounds.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework (MOF)‐Derived Carbon‐Mediated Interfacial Reaction for the Synthesis of CeO₂−MnO₂ Catalysts

Song

Gao

et al. 2019

Chemistry A European J

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CeO2‐based catalysts are widely studied in catalysis fields. Developing one novel synthetic approach to increase the intimate contact between CeO2 and secondary species is of particular importance for enhancing catalytic activities. Herein, an interfacial reaction between metal–organic framework (MOF)‐derived carbon and KMnO4 to synthesize CeO2−MnO2, in which carbon is derived from the pyrolysis of Ce‐MOFs under an inert atmosphere, is described. The MOF‐derived carbon is found to restrain the growth of CeO2 crystallites under a high calcination temperature and, more importantly, intimate contact within CeO2/C is conveyed to CeO2/MnO2 after the interfacial reaction; this is responsible for the high catalytic activity of CeO2−MnO2 towards CO oxidation.

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Catalysts of self-assembled Pt@CeO_2−δ-rich core–shell nanoparticles on 3D ordered macroporous Ce_1−xZr_xO₂for soot oxidation: nanostructure-dependent catalytic activity

Cited by 61 publications

References 58 publications

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Bimetallic Substituted Ceria: An Alternative Approach to Ligand-Free Heck-Mizoroki Cross-Coupling Reactions

Metal–Organic Framework (MOF)‐Derived Carbon‐Mediated Interfacial Reaction for the Synthesis of CeO₂−MnO₂ Catalysts

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Catalysts of self-assembled Pt@CeO2−δ-rich core–shell nanoparticles on 3D ordered macroporous Ce1−xZrxO2for soot oxidation: nanostructure-dependent catalytic activity

Cited by 61 publications

References 58 publications

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Bimetallic Substituted Ceria: An Alternative Approach to Ligand-Free Heck-Mizoroki Cross-Coupling Reactions

Metal–Organic Framework (MOF)‐Derived Carbon‐Mediated Interfacial Reaction for the Synthesis of CeO2−MnO2 Catalysts

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Product

Resources

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Catalysts of self-assembled Pt@CeO_2−δ-rich core–shell nanoparticles on 3D ordered macroporous Ce_1−xZr_xO₂for soot oxidation: nanostructure-dependent catalytic activity

Metal–Organic Framework (MOF)‐Derived Carbon‐Mediated Interfacial Reaction for the Synthesis of CeO₂−MnO₂ Catalysts