Synthesis of mesoporous iridium nanosponge: a highly active, thermally stable and efficient olefin hydrogenation catalyst

2017 ◽  
Vol 46 (34) ◽  
pp. 11431-11439 ◽  
Author(s):  
Sourav Ghosh ◽  
Balaji R. Jagirdar
Keyword(s):  
Catalytic Activity ◽  
Hydrogenation Catalyst ◽  
High Catalytic Activity ◽  
Capping Agent ◽  
Thermally Stable ◽  
Olefin Hydrogenation ◽  
Highly Active

Capping agent dissolution of Ir@BNHx nanocomposite affords mesoporous iridium nanosponge which exhibits high catalytic activity towards olefin hydrogenation of a variety of substrates.

Towards highly active heterogeneous catalysts via a sequential noncovalent bonding strategy

2021 ◽  
Author(s):  
Ruixue Wang ◽  
Ying Yue ◽  
Huiying Wei ◽  
Jinxin Guo ◽  
Yanzhao Yang
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysts ◽  
High Catalytic Activity ◽  
Synthetic Route ◽  
Surface Ligands ◽  
Highly Active ◽  
Noncovalent Bonding ◽  
Excellent Stability

Here, a novel synthetic route of ceria-based nanocatalysts with high catalytic activity and excellent stability was constructed by utilizing function groups from surface ligands. The surface of ceria nanorods were...

Active phase of highly active Co3O4 catalyst for synthetic natural gas production

RSC Advances ◽  
2014 ◽  
Vol 4 (100) ◽  
pp. 57185-57191 ◽  
Author(s):  
Baowei Wang ◽  
Sihan Liu ◽  
Zongyuan Hu ◽  
Zhenhua Li ◽  
Xinbin Ma
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Natural Gas ◽  
Active Phase ◽  
Gas Production ◽  
High Catalytic Activity ◽  
Co Methanation ◽  
Synthetic Natural Gas ◽  
Highly Active ◽  
Catalytic Stability

Co3O4 nanoparticles showed high catalytic activity for low temperature CO methanation. CoO is the active phase of the catalyst. Pre-reduction treatment can improve catalytic stability.

Cascade catalysis of highly active bimetallic Au/Pd nanoclusters: structure–function relationship investigation using anomalous small-angle X-ray scattering and UV–Vis spectroscopy

2013 ◽  
Vol 46 (5) ◽  
pp. 1353-1360 ◽  
Author(s):  
Sylvio Haas ◽  
Robert Fenger ◽  
Edoardo Fertitta ◽  
Klaus Rademann
Keyword(s):  
Catalytic Activity ◽  
Structural Characteristics ◽  
High Surface ◽  
Volume Ratio ◽  
Single Type ◽  
High Catalytic Activity ◽  
Highly Active ◽  
Bimetallic Nanoclusters ◽  
Vis Spectroscopy ◽  
Cascade Catalysis

Recently, a so-called `crown-jewel' concept of preparation of Au/Pd-based colloidal nanoclusters has been reported [Zhang, Watanabe, Okumura, Haruta & Toshima (2011).Nat. Mater.11, 49–52]. Here, a different way of preparing highly active Au/Pd-based nanoclusters is presented. The origin of the increased activity of Au/Pd-based colloidal bimetallic nanoclusters was unclear up to now. However, it is, in general, accepted that in the nanometre range (1–100 nm) the cluster size, shape and composition affect the structural characteristics (e.g.lattice symmetry, unit cell), electronic properties (e.g.band gap) and chemical properties (e.g.catalytic activity) of a material. Hence, a detailed study of the relationship between the nanostructure of nanoclusters and their catalytic activity is presented here. The results indicate that a high surface-to-volume ratio of the nanoclusters combined with the presence of `both' Au and Pd isolated regions at the surface are crucial to achieve a high catalytic activity. A detailed structure elucidation directly leads to a mechanistic proposal, which indeed explains the higher catalytic activity of Au/Pd-based catalysts compared with pure metallic Au or Pd. The mechanism is based on cascade catalysis induced by a single type of nanoparticle with an intermixed surface of Au and Pd.

Nanogold supported on manganese oxide doped alumina microspheres as a highly active and selective catalyst for CO oxidation in a H2-rich stream

2015 ◽  
Vol 51 (100) ◽  
pp. 17728-17731 ◽  
Author(s):  
Yu-Xin Miao ◽  
Wen-Cui Li ◽  
Qiang Sun ◽  
Lei Shi ◽  
Lei He ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Manganese Oxide ◽  
High Catalytic Activity ◽  
Selective Catalyst ◽  
Support Interaction ◽  
Highly Active

The exceptionally high catalytic activity for CO-PROX reaction is due to the Au–support interaction and the unique reducibility of the support.

scholarly journals Highly thermally stable heterogeneous catalysts: study of 0D and 3D porphyrinic MOFs

CrystEngComm ◽  
2017 ◽  
Vol 19 (48) ◽  
pp. 7244-7252 ◽  
Author(s):  
E. Amayuelas ◽  
A. Fidalgo-Marijuán ◽  
B. Bazán ◽  
M. K. Urtiaga ◽  
G. Barandika ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysts ◽  
High Catalytic Activity ◽  
Thermally Stable ◽  
Alkene Oxidation

Porphyrin-based MOFs as heterogeneous catalysts show high catalytic activity, recyclability and selectivity towards alkene oxidation.

Thermally stable sandwich-type catalysts of Pt nanoparticles encapsulated in CeO2 nanorod/CeO2 nanoparticle core/shell supports for methane oxidation at high temperatures

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40323-40329 ◽  
Author(s):  
Zhiyun Zhang ◽  
Jing Li ◽  
Wei Gao ◽  
Zhaoming Xia ◽  
Yuanbin Qin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Methane Oxidation ◽  
High Temperatures ◽  
Pt Nanoparticles ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Thermally Stable ◽  
Sandwich Type ◽  
Nanoparticle Core

A sandwich-type Pt nanocatalyst encapsulated ceria-based core–shell catalyst (CNR@Pt@CNP) was designed and synthesized, which exhibited high catalytic activity and remarkably thermal-stability at high temperatures up to 700 °C.

Thermally stable and highly active Pt/CeO2@SiO2 catalysts with a porous/hollow structure

2018 ◽  
Vol 8 (17) ◽  
pp. 4413-4419 ◽  
Author(s):  
Guozhu Chen ◽  
Ying Yang ◽  
Zeyi Guo ◽  
Daowei Gao ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Hollow Structure ◽  
Selective Etching ◽  
Thermally Stable ◽  
Highly Active

One robust selective-etching approach is used to encapsulate Pt/CeO2 composites into SiO2 with a porous/hollow structure for enhanced thermal stability and catalytic activity.

scholarly journals A highly active Ni/Ce0.8Sm0.2O1.9 anode catalyst with a three-dimensionally ordered macroporous structure for solid oxide fuel cells

2020 ◽  
Vol 8 (16) ◽  
pp. 7792-7800 ◽  
Author(s):  
Tian Gan ◽  
Xinqiang Fan ◽  
Ye Liu ◽  
Chengyu Wang ◽  
Haoran Mei ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Solid Oxide Fuel Cells ◽  
Anode Material ◽  
Solid Oxide ◽  
High Catalytic Activity ◽  
Oxide Fuel ◽  
Macroporous Structure ◽  
Anode Catalyst ◽  
Highly Active ◽  
Ordered Macroporous

Ni/3DOM Ce0.8Sm0.2O1.9 shows a high catalytic activity as the anode material of CH3OH fueled SOFCs.

scholarly journals Computationally Generated Maps of Surface Structures and Catalytic Activities for Alloy Phase Diagrams

2019 ◽  
Author(s):  
Liang Cao ◽  
Le, Niu ◽  
Tim Mueller
Keyword(s):  
Phase Diagram ◽  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Binding Energies ◽  
Alloy Surface ◽  
High Catalytic Activity ◽  
Catalytic Activities ◽  
Highly Active

<p>To facilitate the rational design of alloy catalysts, we introduce a method for rapidly calculating the structure and catalytic properties of a substitutional alloy surface that is in equilibrium with the underlying bulk phase. We implement our method by developing a way to generate surface cluster expansions that explicitly account for the lattice parameter of the bulk structure. This approach makes it possible to computationally map the structure of an alloy surface and statistically sample adsorbate binding energies at every point in the alloy phase diagram. When combined with a method for predicting catalytic activities from adsorbate binding energies, maps of catalytic activities at every point in the phase diagram can be created, enabling the identification of synthesis conditions likely to result in highly active catalysts. We demonstrate our approach by analyzing Pt-rich Pt–Ni catalysts for the oxygen reduction reaction, finding two regions in the phase diagram that are predicted to result in highly active catalysts. Our analysis indicates that the Pt<sub>3</sub>Ni(111) surface, which has the highest known specific activity for the oxygen reduction reaction, is likely able to achieve its high activity through the formation of an intermetallic phase with L1<sub>2</sub> order. We use the generated surface structure and catalytic activity maps to demonstrate how the intermetallic nature of this phase leads to high catalytic activity and discuss how the underlying principles can be used in catalysis design. We further discuss the importance of surface phases and demonstrate how they can dramatically affect catalytic activity.</p>

scholarly journals Polyvinylpyrrolidone - Reduced Graphene Oxide - Pd Nanoparticles as an Efficient Nanocomposite for Catalysis Applications in Cross-Coupling Reactions

2019 ◽  
Vol 14 (3) ◽  
pp. 490
Author(s):  
Hany A. Elazab ◽  
Tamer T. El-Idreesy
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Cross Coupling ◽  
High Catalytic Activity ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Highly Active ◽  
Defect Sites ◽  
Reduced Graphene

This paper reported a scientific approach adopting microwave-assisted synthesis as a synthetic route for preparing highly active palladium nanoparticles stabilized by polyvinylpyrrolidone (Pd/PVP) and supported on reduced Graphene oxide (rGO) as a highly active catalyst used for Suzuki, Heck, and Sonogashira cross coupling reactions with remarkable turnover number (6500) and turnover frequency of 78000 h-1. Pd/PVP nanoparticles supported on reduced Graphene oxide nanosheets (Pd-PVP/rGO) showed an outstanding performance through high catalytic activity towards cross coupling reactions. A simple, reproducible, and reliable method was used to prepare this efficient catalyst using microwave irradiation synthetic conditions. The synthesis approach requires simultaneous reduction of palladium and in the presence of Gaphene oxide (GO) nanosheets using ethylene glycol as a solvent and also as a strong reducing agent. The highly active and recyclable catalyst has so many advantages including the use of mild reaction conditions, short reaction times in an environmentally benign solvent system. Moreover, the prepared catalyst could be recycled for up to five times with nearly the same high catalytic activity. Furthermore, the high catalytic activity and recyclability of the prepared catalyst are due to the strong catalyst-support interaction. The defect sites in the reduced Graphene oxide (rGO) act as nucleation centers that enable anchoring of both Pd/PVP nanoparticles and hence, minimize the possibility of agglomeration which leads to a severe decrease in the catalytic activity. Copyright © 2019 BCREC Group. All rights reserved 

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