One-Pot Synthesis of Core–Shell Structured Metal–Organic Coordination Polymer Microspheres with a Hierarchical Microporous–Mesoporous–Macroporous Structure

2019 ◽  
Vol 72 (6) ◽  
pp. 450
Author(s):  
Yafang Zhou ◽  
Yingxi Xu ◽  
Jianyu Guo ◽  
Siyong Zhang ◽  
Yan Lu
Keyword(s):  
Coordination Polymer ◽  
Heterogeneous Catalysts ◽  
Nitrogen Adsorption ◽  
Core Shell ◽  
Polymer Microspheres ◽  
Nitrate Hexahydrate ◽  
Macroporous Structure ◽  
Hydrothermal Conditions ◽  
One Pot ◽  
Metal Organic

New core–shell structured metal–organic coordination polymer (CP) microspheres with a hierarchical microporous–mesoporous–macroporous structure are synthesized by a one-pot template-free method. The ligand L with a Schiff-base functional group is obtained by reacting 3-hydroxy-4-aminobenzoic acid with para-benzaldehyde. The coordination polymer microspheres (Zn-L-CP) are obtained by mixing the ligand L and zinc nitrate hexahydrate together under hydrothermal conditions. The resultant coordination polymer microspheres with a core–shell structure are characterized by FT-IR and solid state NMR spectroscopy, transmission and scanning electron microscopy, and nitrogen adsorption–desorption measurements. The obtained Zn-L-CP microspheres are proved to be effective heterogeneous catalysts for the deacetylation reaction with the merits of easy recycling and stability. The yield is 96% when using methanol as solvent, and the yield can remain at 90% after seven cycles.

scholarly journals Replacement of Chromium by Non-Toxic Metals in Lewis-Acid MOFs: Assessment of Stability as Glucose Conversion Catalysts

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 437 ◽  
Author(s):  
Ralentri Pertiwi ◽  
Ryan Oozeerally ◽  
David L. Burnett ◽  
Thomas W. Chamberlain ◽  
Nikolay Cherkasov ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Metal Organic Framework ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Major Product ◽  
Hydrothermal Conditions ◽  
Hydroxymethyl Furfural ◽  
Extended Synthesis ◽  
Metal Organic ◽  
Optimum Material

The metal–organic framework MIL-101(Cr) is known as a solid–acid catalyst for the solution conversion of biomass-derived glucose to 5-hydroxymethyl furfural (5-HMF). We study the substitution of Cr3+ by Fe3+ and Sc3+ in the MIL-101 structure in order to prepare more environmentally benign catalysts. MIL-101(Fe) can be prepared, and the inclusion of Sc is possible at low levels (10% of Fe replaced). On extended synthesis times the polymorphic MIL-88B structure instead forms.Increasing the amount of Sc also only yields MIL-88B, even at short crystallisation times. The MIL-88B structure is unstable under hydrothermal conditions, but in dimethylsulfoxide solvent, it provides 5-HMF from glucose as the major product. The optimum material is a bimetallic (Fe,Sc) form of MIL-88B, which provides ~70% conversion of glucose with 35% selectivity towards 5-HMF after 3 hours at 140 °C: this offers high conversion compared to other heterogeneous catalysts reported in the same solvent.

scholarly journals Investigation of Physical Properties of Fe(III) Containing Metal-Organic Polymers

2021 ◽  
Vol 15 ◽  
pp. 204-210
Author(s):  
A. Yu. Ershova ◽  
Minggong Sha
Keyword(s):  
Coordination Polymer ◽  
Functional Materials ◽  
Nitrogen Adsorption ◽  
Structural Elements ◽  
Scanning Calorimetry ◽  
Developed Surface ◽  
Metal Organic ◽  
Porous Coordination Polymer ◽  
Points Of View ◽  
New Generation

n this work, we studied the properties of a specially synthesized organometallic coordination polymer - a porous coordination polymer with biocompatible structural elements based on oxoclusters of iron muconate (III). The samples were investigated by scanning electron microscopy, thermogravimetric analysis combined with differential scanning calorimetry, and the study of low-temperature nitrogen adsorption of a sample obtained by a modified solvothermal technique. It is shown that most of the pores of the sample have an average radius of 18,8 Å ~ 1,88 nm. Also, as a result of the study, it is necessary to conclude that the synthesized material has a developed surface area - it is 512,1 m2/g and the pore volume is ~ 0,48 cm3/g. It should be concluded that such materials are promising as components for a new generation of various kinds of functional materials with improved or unique characteristics. It is obvious that further research in this area is important from both fundamental and applied points of view.

scholarly journals Recyclable Zr/Hf-Containing Acid-Base Bifunctional Catalysts for Hydrogen Transfer Upgrading of Biofuranics: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Yixuan Liu ◽  
Xixi Liu ◽  
Mingrui Li ◽  
Ye Meng ◽  
Jie Li ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Hydrogen Transfer ◽  
Precious Metals ◽  
Renewable Resource ◽  
Transfer Hydrogenation ◽  
Bifunctional Catalysts ◽  
Acid Base ◽  
One Pot ◽  
Catalytic Material ◽  
Metal Organic

The massive burning of a large amount of fossil energy has caused a lot of serious environmental issues (e.g., air pollution and climate change), urging people to efficiently explore and valorize sustainable alternatives. Biomass is being deemed as the only organic carbon-containing renewable resource for the production of net-zero carbon emission fuels and fine chemicals. Regarding this, the selective transformation of high-oxygen biomass feedstocks by catalytic transfer hydrogenation (CTH) is a very promising strategy to realize the carbon cycle. Among them, the important Meerwein-Ponndorf-Verley (MPV) reaction is believed to be capable of replacing the traditional hydrogenation strategy which generally requires high-pressure H2 and precious metals, aiming to upgrade biomass into downstream biochemical products and fuels. Employing bifunctional heterogeneous catalysts with both acidic and basic sites is needed to catalyze the MPV reaction, which is the key point for domino/cascade reaction in one pot that can eliminate the relevant complicated separation/purification step. Zirconium (Zr) and hafnium (Hf), belonging to transition metals, rich in reserves, can demonstrate similar catalytic efficiency for MPV reaction as that of precious metals. This review introduced the application of recyclable heterogeneous non-noble Zr/Hf-containing catalysts with acid-base bifunctionality for CTH reaction using the safe liquid hydrogen donor. The corresponding catalysts were classified into different types including Zr/Hf-containing metal oxides, supported materials, zeolites, metal-organic frameworks, metal-organic hybrids, and their respective pros and cons were compared and discussed comprehensively. Emphasis was placed on evaluating the bifunctionality of catalytic material and the key role of the active site corresponding to the structure of the catalyst in the MPV reaction. Finally, a concise summary and prospect were also provided centering on the development and suggestion of Zr/Hf-containing acid-base bifunctional catalysts for CTH.

Palladium-loaded magnetic core–shell porous carbon nanospheres derived from a metal–organic framework as a recyclable catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (101) ◽  
pp. 82666-82675 ◽  
Author(s):  
Chao Bao ◽  
Lincheng Zhou ◽  
Yanming Shao ◽  
Qiong Wu ◽  
Junjun Ma ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Solvothermal Method ◽  
Metal Organic Framework ◽  
Magnetic Core ◽  
Nitrogen Atmosphere ◽  
Core Shell ◽  
Carbon Nanospheres ◽  
One Pot ◽  
Metal Organic ◽  
Porous Carbon Nanospheres

Pd-loaded magnetic porous carbon nanospheres (Fe3O4@MC-Pd) were prepared by annealing Fe3O4@MIL-100/PdCl2, which was fabricated through a facile one-pot solvothermal method, at 450 °C in nitrogen atmosphere.

scholarly journals Selective One-Pot Two-Step C−C Bond Formation using Metal-Organic Frameworks with Mild Basicity as Heterogeneous Catalysts

ChemCatChem ◽  
2017 ◽  
Vol 9 (21) ◽  
pp. 4019-4023 ◽  
Author(s):  
Francisco G. Cirujano ◽  
Elena López-Maya ◽  
Marleny Rodríguez-Albelo ◽  
Elisa Barea ◽  
Jorge A. R. Navarro ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Bond Formation ◽  
Metal Organic Frameworks ◽  
One Pot ◽  
Metal Organic

scholarly journals Synthesis and structural characterization of a novel 2D supramolecular lead coordination polymer with phenanthroline derivate and adipic acid

2021 ◽  
Vol 44 (1) ◽  
pp. 239-242
Author(s):  
Yu Song ◽  
Yu Yan ◽  
Hua Zhang ◽  
Xiuyan Wang
Keyword(s):  
Coordination Polymer ◽  
Adipic Acid ◽  
Layer Structure ◽  
Dimensional Chain ◽  
Hydrothermal Conditions ◽  
One Dimensional ◽  
1D Chain ◽  
Elemental Analyses ◽  
Metal Organic

Abstract A new metal-organic coordination polymer, [Pb(L)(adip)0.5] (1) was synthesized under hydrothermal conditions by using 1-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)naphthalen-2-ol (HL) and adipic acid (H2adip). The complex 1 was characterized by diffraction and elemental analyses. In complex 1, the binuclear [Pb2L2] units were formed by the OH-deprotonation bridging neighboring Pb(II) atoms, and the adipate linked the binuclear [Pb2L2] units to form a symmetric one-dimensional chain. The 1D chain was further extended to the 2D supramolecular layer structure through π-π interactions between the L ligands.

scholarly journals Novel biocompatible core/shell Fe3O4@NFC@Co(ii) as a new catalyst in a multicomponent reaction: an efficient and sustainable methodology and novel reusable material for one-pot synthesis of 4H-pyran and pyranopyrazole in aqueous media

RSC Advances ◽  
2020 ◽  
Vol 10 (61) ◽  
pp. 37086-37097
Author(s):  
Pouya Ghamari Kargar ◽  
Ghodsieh Bagherzade ◽  
Hossein Eshghi
Keyword(s):  
Multicomponent Reaction ◽  
Heterogeneous Catalysts ◽  
Aqueous Media ◽  
Core Shell ◽  
One Pot ◽  
One Pot Synthesis

Today, due to the developing need for inexpensive catalysts, recyclable magnetic nanocatalysts immobilized on polysaccharides possess many advantages over classical heterogeneous catalysts.

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