Promising ceria–samaria-based nano-oxides for low temperature soot oxidation: a combined study of structure–activity properties

Sudarsanam, Putla; Kuntaiah, Kuncham; Reddy, Benjaram M.

doi:10.1039/c4nj01274g

Cited by 57 publications

(37 citation statements)

References 65 publications

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“…Several diffraction peaks are found at 2θ values of 28.26, 32.83, 47.25, 56.03, 69.2, 76.51, and 78.91°, indicating the presence of fluorite-structured cerium dioxide in the synthesized samples. 35,36 Additionally, two broad XRD peaks are found at ∼35.08 and 38.23°for the MnO x /CeO 2 sample, which can be assigned to α-Mn 2 O 3 phase. 37 Interestingly, the XRD peaks of the MnO x /CeO 2 heteronanostructures are shifted considerably to lower angles compared with those of pure CeO 2 cubes (inset of Figure 3A).…”

Section: Resultsmentioning

confidence: 97%

MnO_x Nanoparticle-Dispersed CeO₂ Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

Sudarsanam

Amin

Reddy

et al. 2015

ACS Appl. Mater. Interfaces

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153

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Understanding the interface-induced effects of heteronanostructured catalysts remains a significant challenge due to their structural complexity, but it is crucial for developing novel applied catalytic materials. This work reports a systematic characterization and catalytic evaluation of MnOx nanoparticle-dispersed CeO2 nanocubes for two important industrial applications, namely, diesel soot oxidation and continuous-flow benzylamine oxidation. The X-ray diffraction and Raman studies reveal an unusual lattice expansion in CeO2 after the addition of MnOx. This interesting observation is due to conversion of smaller sized Ce(4+) (0.097 nm) to larger sized Ce(3+) (0.114 nm) in cerium oxide led by the strong interaction between MnOx and CeO2 at their interface. Another striking observation noticed from transmission electron microscopy, high angle annular dark-field scanning transmission electron microscopy, and electron energy loss spectroscopy studies is that the MnOx species are well-dispersed along the edges of the CeO2 nanocubes. This remarkable decoration leads to an enhanced reducible nature of the cerium oxide at the MnOx/CeO2 interface. It was found that MnOx/CeO2 heteronanostructures efficiently catalyze soot oxidation at lower temperatures (50% soot conversion, T50 ∼660 K) compared with that of bare CeO2 nanocubes (T50 ∼723 K). Importantly, the MnOx/CeO2 heteronanostructures exhibit a noticeable steady performance in the oxidation of benzylamine with a high selectivity of the dibenzylimine product (∼94-98%) compared with that of CeO2 nanocubes (∼69-91%). The existence of a strong synergistic effect at the interface sites between the CeO2 and MnOx components is a key factor for outstanding catalytic efficiency of the MnOx/CeO2 heteronanostructures.

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Section: Resultsmentioning

confidence: 97%

MnO_x Nanoparticle-Dispersed CeO₂ Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

Sudarsanam

Amin

Reddy

et al. 2015

ACS Appl. Mater. Interfaces

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153

100

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“…It is well acknowledged in the literature that the active oxygen species exist on the surface of ceria‐based materials plays an important role in the soot oxidation 2,6,44,45. It is hypothesized that the active oxygen can be created by adsorption of gaseous oxygen, thereby it reacts with soot adsorbed on the catalyst surface leading to the formation of CO x species 46. Therefore, the presence of active surface oxygen could be responsible for soot oxidation.…”

Section: Resultsmentioning

confidence: 99%

Protein Flexibility in Drug Discovery: From Theory to Computation

2015

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Nowadays it is widely accepted that the mechanisms of biomolecular recognition are strongly coupled to the intrinsic dynamic of proteins. In past years, this evidence has prompted the development of theoretical models of recognition able to describe ligand binding assisted by protein conformational changes. On a different perspective, the need to take into account protein flexibility in structure-based drug discovery has stimulated the development of several and extremely diversified computational methods. Herein, on the basis of a parallel between the major recognition models and the simulation strategies used to account for protein flexibility in ligand binding, we sort out and describe the most innovative and promising implementations for structure-based drug discovery.

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“…Figure represent the correlation of 50 % soot oxidation performance (T 50 ) of codoped ceria (CMC773) catalyst with that of Ce‐Zr, Ce‐Gd,Ce–La, Ce‐Pr, Ce‐Sm, and Ce‐Eu solid solutions obtained by similar preparation method.…”

Section: Catalytic Activity Studiesmentioning

confidence: 99%

“…The T 50 values of investigated catalysts increased in the order of CMC773 (636 K) < CC773 (677 K) < CM773 (757 K) < C773 (874 K) < unanalysed (920 K). Figure 11 represent the correlation of 50 % soot oxidation performance (T 50 ) of codoped ceria (CMC773) catalyst with that of Ce-Zr, [14] Ce-Gd, [35] Ce-La, [14] Ce-Pr, [36] Ce-Sm, [37] and Ce-Eu [38] solid solutions obtained by similar preparation method.…”

Section: Soot Oxidationmentioning

confidence: 99%

Enhanced Catalytic Performance of Manganese and Cobalt Co–doped CeO₂ Catalysts for Diesel Soot Oxidation

et al. 2016

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Nanosized manganese and cobalt codoped ceria (Ce0.8Mn0.1Co0.1O2−δ) solid solutions have been prepared through simple coprecipitation method to study the effect of Mn and Co bi‐dopants towards diesel soot oxidation. Pure ceria (CeO2), manganese doped ceria (Ce0.8Mn0.2O2−δ), and cobalt doped ceria (Ce0.8Co0.2O2−δ) solid solutions have also been prepared for comparison. XRD results revealed the formation of solid solutions in doped samples. XPS results confirmed the presence of more Ce3+ ions and surface adsorbed oxygen in codoped ceria. H2‐TPR study disclosed that the codoping of ceria exceptionally improves the redox behaviour of CeO2. The catalytic activity results demonstrate that Ce0.8Mn0.1Co0.1O2−δ shows much better activity (T50 ∼ 636 K) while compared to pure CeO2 (T50 ∼ 874 K) in tight contact conditions. A larger surface area, facile redox behaviour, and high concentration of surface adsorbed oxygen species are proposed to be the crucial factors for the enhanced catalytic activity.

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Promising ceria–samaria-based nano-oxides for low temperature soot oxidation: a combined study of structure–activity properties

Abstract: Nanostructured Ce–Sm mixed oxides are promising catalysts for diesel soot oxidation through facile active oxygen participation.

Cited by 57 publications

References 65 publications

MnO_x Nanoparticle-Dispersed CeO₂ Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

MnO_x Nanoparticle-Dispersed CeO₂ Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

Protein Flexibility in Drug Discovery: From Theory to Computation

Enhanced Catalytic Performance of Manganese and Cobalt Co–doped CeO₂ Catalysts for Diesel Soot Oxidation

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Promising ceria–samaria-based nano-oxides for low temperature soot oxidation: a combined study of structure–activity properties

Abstract: Nanostructured Ce–Sm mixed oxides are promising catalysts for diesel soot oxidation through facile active oxygen participation.

Cited by 57 publications

References 65 publications

MnOx Nanoparticle-Dispersed CeO2 Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

MnOx Nanoparticle-Dispersed CeO2 Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

Protein Flexibility in Drug Discovery: From Theory to Computation

Enhanced Catalytic Performance of Manganese and Cobalt Co–doped CeO2 Catalysts for Diesel Soot Oxidation

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Product

Resources

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MnO_x Nanoparticle-Dispersed CeO₂ Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

MnO_x Nanoparticle-Dispersed CeO₂ Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

Enhanced Catalytic Performance of Manganese and Cobalt Co–doped CeO₂ Catalysts for Diesel Soot Oxidation