Bis(imino)pyridine Iron and Cobalt Complexes Immobilized into Interlayer Space of Fluorotetrasilicic Mica: Highly Active Heterogeneous Catalysts for Polymerization of Ethylene

2007 ◽  
Vol 36 (8) ◽  
pp. 1004-1005 ◽  
Author(s):  
Hideki Kurokawa ◽  
Michiko Matsuda ◽  
Kenji Fujii ◽  
Yoshiyuki Ishihama ◽  
Tsutomu Sakuragi ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Interlayer Space ◽  
Cobalt Complexes ◽  
Highly Active

Laser electrodispersion as a new chlorine-free method for the production of highly effective metal-containing supported catalysts

2012 ◽  
Vol 84 (3) ◽  
pp. 495-508 ◽  
Author(s):  
Ekaterina S. Lokteva ◽  
Anton A. Peristyy ◽  
Natalia E. Kavalerskaya ◽  
Elena V. Golubina ◽  
Lada V. Yashina ◽  
...  
Keyword(s):  
Gas Phase ◽  
High Stability ◽  
Heterogeneous Catalysts ◽  
Supported Catalysts ◽  
Promising Technique ◽  
Wet Impregnation ◽  
Oxide Supports ◽  
Highly Active ◽  
Specific Catalytic Activity ◽  
Free Metal

Laser electrodispersion (LED) of metals is a promising technique for the preparation of heterogeneous catalysts as an alternative to wet impregnation of supports with the corresponding salt solutions. The LED technique can be used to deposit highly active chloride- and nitrate-free metal nanoparticles onto carbon or oxide supports. We report preparation and properties of new Ni-, Pd-, and Au-containing alumina-supported catalysts with low metal loadings (10–3–10–4 % mass) and their comparison with the previously studied carbon (Sibunit) supported systems. The catalysts demonstrate high stability and extremely high specific catalytic activity (by 2–3 orders of magnitude higher than for traditional catalysts) in the gas-phase hydrodechlorination (HDC) of chlorobenzene (CB).

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...

scholarly journals Polymeric Heterogeneous Catalysts in the Hydroformylation of Unsaturated Compounds

2020 ◽  
Author(s):  
D. P. Zhuchkov ◽  
M. V. Nenasheva ◽  
M. V. Terenina ◽  
Yu. S. Kardasheva ◽  
D. N. Gorbunov ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Polymer Structure ◽  
Organic Polymer ◽  
Synthesis Methods ◽  
Special Focus ◽  
Organic Media ◽  
High Concentration ◽  
Catalyst Synthesis ◽  
Unsaturated Compounds ◽  
Highly Active

Abstract This review deals with heterogeneous hydroformylation catalysts, specifically metal complexes fixed in an organic polymer structure. It describes the main catalyst synthesis methods, provides data on hydroformylation of unsaturated compounds (including asymmetric hydroformylation), and shows how those compounds can be used. The special focus is on the systematization of data on heterogeneous catalysts developed on the basis of porous organic polymers. Due to their porous structure, resistance to organic media and the high concentration of heteroatoms they contain, these materials can be considered promising for developing highly active, selective and stable heterogeneous catalysts for hydroformylation of unsaturated compounds, particularly higher linear olefins.

MgLa mixed oxides as highly active and selective heterogeneous catalysts for Wadsworth–Emmons reactions

2005 ◽  
Vol 55 (3) ◽  
pp. 177-183 ◽  
Author(s):  
M.L. Kantam ◽  
H. Kochkar ◽  
J.-M. Clacens ◽  
B. Veldurthy ◽  
A. Garcia-Ruiz ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Mixed Oxides ◽  
Highly Active

Halogen-Substituted 2,6-Bis(imino)pyridyl Iron and Cobalt Complexes:  Highly Active Catalysts for Polymerization and Oligomerization of Ethylene

2003 ◽  
Vol 22 (21) ◽  
pp. 4312-4321 ◽  
Author(s):  
Yaofeng Chen ◽  
Ruifang Chen ◽  
Changtao Qian ◽  
Xicheng Dong ◽  
Jie Sun
Keyword(s):  
Cobalt Complexes ◽  
Highly Active

Highly active dinuclear cobalt complexes for solvent-free cycloaddition of CO2 to epoxides at ambient pressure

2019 ◽  
Vol 55 (57) ◽  
pp. 8274-8277 ◽  
Author(s):  
Zafar A. K. Khattak ◽  
Hussein A. Younus ◽  
Nazir Ahmad ◽  
Habib Ullah ◽  
Suleman Suleman ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Coupling Reaction ◽  
Cobalt Complexes ◽  
Solvent Free ◽  
Highly Active

Dinuclear Co-based catalysts are used for the coupling reaction of epoxides and CO2 in the presence of a cocatalyst.

Palladium immobilized on functionalized hypercrosslinked polymers: a highly active and recyclable catalyst for Suzuki–Miyaura coupling reactions in water

2019 ◽  
Vol 43 (31) ◽  
pp. 12206-12210 ◽  
Author(s):  
Xi Liu ◽  
Wei Xu ◽  
Dexuan Xiang ◽  
Zaixing Zhang ◽  
Dizhao Chen ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Palladium Complexes ◽  
Recyclable Catalyst ◽  
Cross Linking ◽  
Coupling Reactions ◽  
Highly Active ◽  
Hypercrosslinked Polymers

Three palladium complexes were synthesized via an external cross-linking reaction and found to be effective heterogeneous catalysts for the Suzuki–Miyaura reaction.

scholarly journals Dynamic observation of manganese adatom mobility at perovskite oxide catalyst interfaces with water

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Gaurav Lole ◽  
Vladimir Roddatis ◽  
Ulrich Ross ◽  
Marcel Risch ◽  
Tobias Meyer ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Adsorbed Water ◽  
Perovskite Oxide ◽  
Microscopy Imaging ◽  
Highly Active ◽  
Transmission Electron ◽  
Manganite Perovskite ◽  
Manganese Valence ◽  
Atom Dynamics

Abstract Real time in-situ microscopy imaging of surface structure and atom dynamics of heterogeneous catalysts is an important step for understanding reaction mechanisms. Here, using in-situ environmental transmission electron microscopy (ETEM), we directly visualize surface atom dynamics at manganite perovskite catalyst surfaces for oxygen evolution reaction (OER), which are ≥20 times faster in water than in other ambients. Comparing (001) surfaces of La0.6Sr0.4MnO3 and Pr0.67Ca0.33MnO3 with similar initial manganese valence state and OER activity, but very different OER stability, allows us to distinguish between reversible surface adatom dynamics and irreversible surface defect chemical reactions. We observe enhanced reversible manganese adatom dynamics due to partial solvation in adsorbed water for the highly active and stable La0.6Sr0.4MnO3 system, suggesting that aspects of homogeneous catalysis must be included for understanding the OER mechanism in heterogeneous catalysis.

scholarly journals Fe3+-Exchanged Titanate Nanotubes: A New Kind of Highly Active Heterogeneous Catalyst for Friedel-Crafts Type Benzylation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Yunchen Du ◽  
Di Guo ◽  
Meiling Xiong ◽  
Yanwu Qi ◽  
Chenkui Cui ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Heterogeneous Catalyst ◽  
Heterogeneous Catalysts ◽  
Catalyst Support ◽  
Environmental Benefits ◽  
Titanate Nanotubes ◽  
Catalytic Activities ◽  
Highly Active ◽  
Active Metal ◽  
Benzylation Of Benzene

Heterogeneous catalysis for Friedel-Crafts type benzylation has received much attention in recent years due to its characteristic of environmental benefits. In this paper, titanate nanotubes (TNTs) were employed as heterogeneous catalyst support, and a new kind of Fe3+-exchanged titanate nanotubes (Fe-TNTs) catalyst with highly dispersed ferric sites was constructed by an ion exchange technique. The obtained catalyst was systematically characterized by XRD, TEM, N2adsorption, XPS, and UV-vis spectra. As expected, Fe-TNTs showed excellent catalytic activities in the benzylation of benzene and benzene derivatives. The recycling tests for Fe-TNTs were also carried out, where the reason for the gradually decreased activity was carefully investigated. Superior to some reported catalysts, the catalytic ability of used Fe-TNTs could be easily recovered by ion exchange again, indicating that Fe-TNTs herein were a highly active and durable heterogeneous catalyst for Friedel-Crafts type benzylation. These results might be helpful for the design and preparation of novel heterogeneous catalysts by combining the structural advantages of titanate nanotubes and active metal ions.

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