An efficient self-assembly Ru - Al material as heterogeneous catalyst for water oxidation

2016 ◽  
Vol 70 ◽  
pp. 129-131
Author(s):  
Feng Ding ◽  
Lina Duan ◽  
Yan Gao
Keyword(s):  
Heterogeneous Catalyst ◽  
Self Assembly ◽  
Water Oxidation

Controllable Synthesis of Cobalt Porphyrin Nanocrystals through Micelle Confinement Self-Assembly

MRS Advances ◽  
2020 ◽  
Vol 5 (42) ◽  
pp. 2147-2155
Author(s):  
Sudi Chen ◽  
Xitong Ren ◽  
Shufang Tian ◽  
Jiajie Sun ◽  
Feng Bai
Keyword(s):  
Self Assembly ◽  
Water Oxidation ◽  
Separation Efficiency ◽  
Noncovalent Interactions ◽  
Building Blocks ◽  
The Self ◽  
Hexagonal Prism ◽  
Assembly Process ◽  
Surfactant Micelles ◽  
Cobalt Porphyrin

AbstractThe self-assembly of optically active building blocks into functional nanocrystals as high-activity photocatalysts is a key in the field of photocatalysis. Cobalt porphyrin with abundant catalytic properties is extensively studied in photocatalytic water oxidation and CO2 reduction. Here, we present the fabrication of cobalt porphyrin nanocrystals through a surfactant-assisted interfacial self-assembly process using Co-tetra(4-pyridyl) porphyrin as building block. The self-assembly process relies on the combined noncovalent interactions such as π-π stacking and axial Co-N coordination between individual porphyrin molecules within surfactant micelles. Tuning different reaction conditions (temperature, the ratio of co-solvent DMF) and types of surfactant, various nanocrystals with well-defined 1D to 3D morphologies such as nanowires, nanorods and nano hexagonal prism were obtained. Due to the ordered accumulation of molecules, the nanocrystals exhibit the properties of the enhanced capability of visible light capture and can conduce to improve the transport and separation efficiency of the photogenerated carriers, which is important for photocatalysis. Further studies of photocatalytic CO2 reduction are being performed to address the relationship between the size and shape of the nanocrystals with the photocatalytic activity.

scholarly journals A New Heterogeneous Catalyst Obtained via Supramolecular Decoration of Graphene with a Pd2+ Azamacrocyclic Complex

Molecules ◽  
2019 ◽  
Vol 24 (15) ◽  
pp. 2714 ◽  
Author(s):  
Matteo Savastano ◽  
Paloma Arranz-Mascarós ◽  
Maria Paz Clares ◽  
Rafael Cuesta ◽  
Maria Luz Godino-Salido ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Self Assembly ◽  
Room Temperature ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Assembly Process ◽  
Efficient Catalyst ◽  
Mild Conditions ◽  
Cross Coupling Reaction ◽  
Green Procedure

A new G-(H2L)-Pd heterogeneous catalyst has been prepared via a self-assembly process consisting in the spontaneous adsorption, in water at room temperature, of a macrocyclic H2L ligand on graphene (G) (G + H2L = G-(H2L)), followed by decoration of the macrocycle with Pd2+ ions (G-(H2L) + Pd2+ = G-(H2L)-Pd) under the same mild conditions. This supramolecular approach is a sustainable (green) procedure that preserves the special characteristics of graphene and furnishes an efficient catalyst for the Cu-free Sonogashira cross coupling reaction between iodobenzene and phenylacetylene. Indeed, G-(H2L)-Pd shows an excellent conversion (90%) of reactants into diphenylacetylene under mild conditions (50 °C, water, aerobic atmosphere, 14 h). The catalyst proved to be reusable for at least four cycles, although decreasing yields down to 50% were observed.

Self-assembly of a cobalt(II)-based metal–organic framework as an effective water-splitting heterogeneous catalyst for light-driven hydrogen production

2020 ◽  
Vol 76 (6) ◽  
pp. 616-624
Author(s):  
Yong Dou ◽  
Lu Yang ◽  
Lan Qin ◽  
Yunhui Dong ◽  
Zhen Zhou ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Heterogeneous Catalyst ◽  
Water Splitting ◽  
Self Assembly ◽  
Fossil Fuels ◽  
Metal Organic Framework ◽  
Chemical Conversion ◽  
Green Energy ◽  
Metal Organic ◽  
Organic Framework

The solar photocatalysis of water splitting represents a significant branch of enzymatic simulation by efficient chemical conversion and the generation of hydrogen as green energy provides a feasible way for the replacement of fossil fuels to solve energy and environmental issues. We report herein the self-assembly of a CoII-based metal–organic framework (MOF) constructed from 4,4′,4′′,4′′′-(ethene-1,1,2,2-tetrayl)tetrabenzoic acid [or tetrakis(4-carboxyphenyl)ethylene, H4TCPE] and 4,4′-bipyridyl (bpy) as four-point- and two-point-connected nodes, respectively. This material, namely, poly[(μ-4,4′-bipyridyl)[μ8-4,4′,4′′,4′′′-(ethene-1,1,2,2-tetrayl)tetrabenzoato]cobalt(II)], [Co(C30H16O8)(C10H8N2)] n , crystallized as dark-red block-shaped crystals with high crystallinity and was fully characterized by single-crystal X-ray diffraction, PXRD, IR, solid-state UV–Vis and cyclic voltammetry (CV) measurements. The redox-active CoII atoms in the structure could be used as the catalytic sites for hydrogen production via water splitting. The application of this new MOF as a heterogeneous catalyst for light-driven H2 production has been explored in a three-component system with fluorescein as photosensitizer and trimethylamine as the sacrificial electron donor, and the initial volume of H2 production is about 360 µmol after 12 h irradiation.

Bis[N,N′-(2-indanolyl)]-1,5-diazacyclooctane as Unique Metal Ligand: Self-Assembly of Palladium Nanoparticles and Catalytic Reactivity on C–C Bond Formation

Synthesis ◽  
2017 ◽  
Vol 50 (05) ◽  
pp. 1097-1104 ◽  
Author(s):  
Katsunori Tanaka ◽  
Katsumasa Fujiki
Keyword(s):  
Heterogeneous Catalyst ◽  
Self Assembly ◽  
Palladium Nanoparticles ◽  
Bond Formation ◽  
Suzuki Coupling ◽  
Catalyst Loading ◽  
Loading Conditions ◽  
Catalytic Reactivity ◽  
Low Catalyst Loading ◽  
Metal Ligand

A previously unreported 1,5-diazacyclooctane-palladium(II) complex was synthesized using bis[N,N′-(2-indanolyl)]-1,5-diazacyclooctane, which was readily prepared via a novel [4+4] homocyclization of the unsaturated imine intermediate generated from acrolein and 1-amino-2-indanol. Interestingly, the 1,5-diazacyclooctane-palladium(II) complex self-assembled to form palladium nanoparticles. This approach readily provided palladium nanoparticles simply by heating a mixture of palladium(II) acetate and bis[N,N′-(2-indanolyl)]-1,4-diazacyclooctane in dichloroethane at mild temperatures. The 1,5-diazacyclooctane-derivative-palladium nanoparticles were successfully deployed in synthetic applications as a heterogeneous catalyst, facilitating Suzuki coupling and a challenging C–C bond formation via C(sp3)–H activation under low catalyst loading conditions.

Self-Assembly of Active IrO2Colloid Catalyst on an ITO Electrode for Efficient Electrochemical Water Oxidation

2005 ◽  
Vol 109 (46) ◽  
pp. 21489-21491 ◽  
Author(s):  
Masayuki Yagi ◽  
Emi Tomita ◽  
Sayaka Sakita ◽  
Takayuki Kuwabara ◽  
Keiji Nagai
Keyword(s):  
Self Assembly ◽  
Water Oxidation ◽  
Ito Electrode

Ni-based heterogeneous catalyst from a designed molecular precursor for the efficient electrochemical water oxidation

2016 ◽  
Vol 52 (59) ◽  
pp. 9255-9258 ◽  
Author(s):  
Denis A. Kuznetsov ◽  
Dmitry V. Konev ◽  
Natal'ya S. Komarova ◽  
Andrey M. Ionov ◽  
Rais N. Mozhchil ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Water Oxidation ◽  
Single Source ◽  
Molecular Precursor ◽  
Excellent Activity ◽  
Single Source Precursor

Bimetallic Ni–Mo alkoxide was exploited as a single-source precursor for the production of water-oxidizing catalyst films demonstrating excellent activity and stability.

Bio-inspired organic cobalt(ii) phosphonates toward water oxidation

2015 ◽  
Vol 8 (2) ◽  
pp. 526-534 ◽  
Author(s):  
Tianhua Zhou ◽  
Danping Wang ◽  
Simon Chun-Kiat Goh ◽  
Jindui Hong ◽  
Jianyu Han ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Water Oxidation ◽  
Metal Organic ◽  
Organic Phosphonate

A new layered metal–organic phosphonate crystal with both mono- and di-μ-oxo bridged octahedral cobalt was synthesized and acts as an efficient and stable heterogeneous catalyst for water oxidation.

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