The rational design of sandwich-like MnO2–Pd–CeO2 hollow spheres with enhanced activity and stability for CO oxidation

Nanoscale ◽  
2019 ◽  
Vol 11 (14) ◽  
pp. 6776-6783 ◽  
Author(s):  
Jian Zhang ◽  
Tong Li ◽  
Chang-An Wang ◽  
Jing-Li Luo
Keyword(s):  
Co Oxidation ◽  
Rational Design ◽  
Hollow Spheres ◽  
Synthesis Process ◽  
Enhanced Activity

The synthesis process of sandwich-like MnO2–Pd–CeO2 hollow spheres.

scholarly journals Facet-Dependent Reactivity of Ceria Nanoparticles Exemplified by CeO2-Based Transition Metal Catalysts: A Critical Review

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 452
Author(s):  
Michalis Konsolakis ◽  
Maria Lykaki
Keyword(s):  
Transition Metal ◽  
Co Oxidation ◽  
Critical Review ◽  
Rational Design ◽  
Metal Catalysts ◽  
Co2 Hydrogenation ◽  
Transition Metal Catalysts ◽  
Fine Tuning ◽  
Ceria Nanoparticles ◽  
Highly Active

The rational design and fabrication of highly-active and cost-efficient catalytic materials constitutes the main research pillar in catalysis field. In this context, the fine-tuning of size and shape at the nanometer scale can exert an intense impact not only on the inherent reactivity of catalyst’s counterparts but also on their interfacial interactions; it can also opening up new horizons for the development of highly active and robust materials. The present critical review, focusing mainly on our recent advances on the topic, aims to highlight the pivotal role of shape engineering in catalysis, exemplified by noble metal-free, CeO2-based transition metal catalysts (TMs/CeO2). The underlying mechanism of facet-dependent reactivity is initially discussed. The main implications of ceria nanoparticles’ shape engineering (rods, cubes, and polyhedra) in catalysis are next discussed, on the ground of some of the most pertinent heterogeneous reactions, such as CO2 hydrogenation, CO oxidation, and N2O decomposition. It is clearly revealed that shape functionalization can remarkably affect the intrinsic features and in turn the reactivity of ceria nanoparticles. More importantly, by combining ceria nanoparticles (CeO2 NPs) of specific architecture with various transition metals (e.g., Cu, Fe, Co, and Ni) remarkably active multifunctional composites can be obtained due mainly to the synergistic metalceria interactions. From the practical point of view, novel catalyst formulations with similar or even superior reactivity to that of noble metals can be obtained by co-adjusting the shape and composition of mixed oxides, such as Cu/ceria nanorods for CO oxidation and Ni/ceria nanorods for CO2 hydrogenation. The conclusions derived could provide the design principles of earth-abundant metal oxide catalysts for various real-life environmental and energy applications.

Influence of Pt Size and CeO2 Morphology at the Pt-CeO2 Interface in CO Oxidation

2021 ◽  
Author(s):  
Sinmyung Yoon ◽  
Hyunwoo Ha ◽  
Jihun Kim ◽  
Eonu Nam ◽  
Mi Yoo ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Metal Nanoparticles ◽  
Rational Design ◽  
Catalytic Performance ◽  
Electronic Interactions ◽  
Oxide Supports ◽  
Metal Support ◽  
Metal Support Interactions

Understanding the inherent catalytic nature of the interface between metal nanoparticles (NPs) and oxide supports enables the rational design of metal-support interactions for high catalytic performance. Electronic interactions at the...

Synthesis of mesoporous silica–zirconia composite hollow spheres with enhanced activity toward hydrolysis of ammonia borane

2020 ◽  
Vol 294 ◽  
pp. 109839 ◽  
Author(s):  
Naoki Toyama ◽  
Natsumi Nikura ◽  
Ikaru Ito ◽  
Tetsuo Umegaki ◽  
Yoshiyuki Kojima
Keyword(s):  
Mesoporous Silica ◽  
Hollow Spheres ◽  
Ammonia Borane ◽  
Enhanced Activity ◽  
Hydrolysis Of

scholarly journals Effect of the Preparation Method on the Physicochemical Properties and the CO Oxidation Performance of Nanostructured CeO2/TiO2 Oxides

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 847 ◽  
Author(s):  
Sofia Stefa ◽  
Maria Lykaki ◽  
Dimitrios Fragkoulis ◽  
Vasileios Binas ◽  
Pavlos K. Pandis ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Co Oxidation ◽  
Rational Design ◽  
Mixed Oxides ◽  
Oxygen Storage ◽  
Precipitation Method ◽  
Stöber Method ◽  
X Ray ◽  
Oxidation Performance ◽  
The Stöber Method

Ceria-based mixed oxides have been widely studied in catalysis due to their unique surface and redox properties, with implications in numerous energy- and environmental-related applications. In this regard, the rational design of ceria-based composites by means of advanced synthetic routes has gained particular attention. In the present work, ceria–titania composites were synthesized by four different methods (precipitation, hydrothermal in one and two steps, Stöber) and their effect on the physicochemical characteristics and the CO oxidation performance was investigated. A thorough characterization study, including N2 adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscopy (TEM) and H2 temperature-programmed reduction (H2-TPR) was performed. Ceria–titania samples prepared by the Stöber method, exhibited the optimum CO oxidation performance, followed by samples prepared by the hydrothermal method in one step, whereas the precipitation method led to almost inactive oxides. CeO2/TiO2 samples synthesized by the Stöber method display a rod-like morphology of ceria nanoparticles with a uniform distribution of TiO2, leading to enhanced reducibility and oxygen storage capacity (OSC). A linear relationship was disclosed among the catalytic performance of the samples prepared by different methods and the abundance of reducible oxygen species.

scholarly journals The rational design of hierarchical MoS2 nanosheet hollow spheres sandwiched between carbon and TiO2@graphite as an improved anode for lithium-ion batteries

2019 ◽  
Vol 1 (5) ◽  
pp. 1957-1964 ◽  
Author(s):  
Faze Wang ◽  
Fanggang Li ◽  
Maojun Zheng ◽  
Yanbo Li ◽  
Li Ma
Keyword(s):  
Lithium Ion Batteries ◽  
Amorphous Carbon ◽  
Hollow Sphere ◽  
Rational Design ◽  
Specific Capacity ◽  
Hollow Spheres ◽  
Lithium Ion ◽  
Carbon Shell ◽  
Lithium Storage ◽  
Mos2 Nanosheet

Hierarchical MoS2 nanosheet hollow sphere is sandwiched by graphite and amorphous carbon shell, showing high reversible specific capacity and cycling stability for lithium storage.

scholarly journals Making 3D-Cry Toxin Mutants: Much More Than a Tool of Understanding Toxins Mechanism of Action

Toxins ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 600
Author(s):  
Susana Vílchez
Keyword(s):  
Mechanism Of Action ◽  
Rational Design ◽  
Historical Context ◽  
Cry Toxins ◽  
Natural Toxins ◽  
Enhanced Activity ◽  
Cry Toxin ◽  
Improved Performance ◽  
Bacterium Bacillus ◽  
Made In

3D-Cry toxins, produced by the entomopathogenic bacterium Bacillus thuringiensis, have been extensively mutated in order to elucidate their elegant and complex mechanism of action necessary to kill susceptible insects. Together with the study of the resistant insects, 3D-Cry toxin mutants represent one of the pillars to understanding how these toxins exert their activity on their host. The principle is simple, if an amino acid is involved and essential in the mechanism of action, when substituted, the activity of the toxin will be diminished. However, some of the constructed 3D-Cry toxin mutants have shown an enhanced activity against their target insects compared to the parental toxins, suggesting that it is possible to produce novel versions of the natural toxins with an improved performance in the laboratory. In this report, all mutants with an enhanced activity obtained by accident in mutagenesis studies, together with all the variants obtained by rational design or by directed mutagenesis, were compiled. A description of the improved mutants was made considering their historical context and the parallel development of the protein engineering techniques that have been used to obtain them. This report demonstrates that artificial 3D-Cry toxins made in laboratories are a real alternative to natural toxins.

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