One-step Bulk Fabrication of CaO/Carbon Heterogeneous Catalyst from Calcium Citrate for Rapid Synthesis of Dimethyl Carbonate (DMC) by Transesterification of Ethylene Carbonate (EC)

2021 ◽  
Author(s):  
Qiang WEI ◽  
Gang Zhang ◽  
Jie Yao ◽  
Xue Jun Chen ◽  
Gongying Wang ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Dimethyl Carbonate ◽  
High Efficiency ◽  
Low Cost ◽  
Ethylene Carbonate ◽  
Calcium Citrate ◽  
Rapid Synthesis ◽  
One Step

Dimethyl carbonate (DMC) is well known as an extremely industrially valuable substance. The demand for high-efficiency synthesis of DMC has greatly driven the exploration of novel catalysts and their low-cost...

One-step fabrication of Fe3O4–Cu nanocomposites: High-efficiency and low-cost catalysts for reduction of 4-nitrophenol

2021 ◽  
Vol 260 ◽  
pp. 124144
Author(s):  
Wenshi Zhao ◽  
Shuo Yang ◽  
Chenzi Guo ◽  
Jinghai Yang ◽  
Yang Liu
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
One Step

A rapid metal free synthesis of 5-substituted-1H-tetrazoles using cuttlebone as a natural high effective and low cost heterogeneous catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 49849-49860 ◽  
Author(s):  
Sara S. E. Ghodsinia ◽  
Batool Akhlaghinia
Keyword(s):  
Heterogeneous Catalyst ◽  
Sodium Azide ◽  
High Efficiency ◽  
Low Cost ◽  
Cycloaddition Reaction ◽  
Metal Free ◽  
Substituted 1

A convenient, rapid and metal free synthesis of 5-substituted-1H-tetrazoles by [3 + 2] cycloaddition reaction of nitriles with sodium azide. Cuttlebone as a natural low cost heterogeneous catalyst affords 5-substituted-1H-tetrazoles rapidly with high efficiency.

Research on Rubber One Step Injection Molding Technology and Equipment

2012 ◽  
Vol 501 ◽  
pp. 344-348
Author(s):  
Yi Zhou Pei ◽  
Bai Yuan Lv
Keyword(s):  
Injection Molding ◽  
High Efficiency ◽  
Low Cost ◽  
New Technology ◽  
Laboratory Research ◽  
Molding Method ◽  
Good Product ◽  
One Step ◽  
The One ◽  
Good Product Quality

Through the laboratory research on the one step injection molding technology, as well as a series of industrialization researches on the injection tire capsule, injection oilfield used screw drill rubber stator and injection solid tire, this thesis presents the principle of one step injection molding technology and proves the feasibility, practicability of this technology. Substituting the traditional compression molding method, one step injection molding is a new technology with high efficiency, good product quality and low cost; it also has a broad prospect of application and huge developing potential.

Influence of MBE Growth Conditions on Dislocation Densities of GaAs/Ge Epilayers Grown on Silicon Substrates

1985 ◽  
Vol 43 ◽  
pp. 364-365
Author(s):  
K.M. Hones ◽  
P. Sheldon ◽  
B.G. Yacobi ◽  
A. Mason
Keyword(s):  
High Efficiency ◽  
Lattice Mismatch ◽  
Low Cost ◽  
Growth Conditions ◽  
Nonradiative Recombination ◽  
Device Structure ◽  
Si Substrates ◽  
Transmission Electron ◽  
Dislocation Densities ◽  
Dislocation Type

There is increasing interest in growing epitaxial GaAs on Si substrates. Such a device structure would allow low-cost substrates to be used for high-efficiency cascade- junction solar cells. However, high-defect densities may result from the large lattice mismatch (∼4%) between the GaAs epilayer and the silicon substrate. These defects can act as nonradiative recombination centers that can degrade the optical and electrical properties of the epitaxially grown GaAs. For this reason, it is important to optimize epilayer growth conditions in order to minimize resulting dislocation densities. The purpose of this paper is to provide an indication of the quality of the epitaxially grown GaAs layers by using transmission electron microscopy (TEM) to examine dislocation type and density as a function of various growth conditions. In this study an intermediate Ge layer was used to avoid nucleation difficulties observed for GaAs growth directly on Si substrates. GaAs/Ge epilayers were grown by molecular beam epitaxy (MBE) on Si substrates in a manner similar to that described previously.

Dual Nickel/Palladium-Catalyzed Reductive Cross-Coupling Reactions Between Two Phenol Derivatives

2020 ◽  
Author(s):  
Baojian Xiong ◽  
Yue Li ◽  
Yin Wei ◽  
Søren Kramer ◽  
Zhong Lian
Keyword(s):  
Functional Group ◽  
Low Cost ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Phenol Derivatives ◽  
Cross Coupling Reactions ◽  
Palladium Catalyzed ◽  
One Step ◽  
Aryl Tosylates ◽  
Low Sensitivity

Cross-coupling between substrates that can be easily derived from phenols is highly attractive due to the abundance and low cost of phenols. Here, we report a dual nickel/palladium-catalyzed reductive cross-coupling between aryl tosylates and aryl triflates; both substrates can be accessed in just one step from readily available phenols. The reaction has a broad functional group tolerance and substrate scope (>60 examples). Furthermore, it displays low sensitivity to steric effects demonstrated by the synthesis of a 2,2’disubstituted biaryl and a fully substituted aryl product. The widespread presence of phenols in natural products and pharmaceuticals allow for straightforward late-stage functionalization, illustrated with examples such as Ezetimibe and tyrosine. NMR spectroscopy and DFT calculations indicate that the nickel catalyst is responsible for activating the aryl triflate, while the palladium catalyst preferentially reacts with the aryl tosylate.

Synthesis of carbonate esters by carboxymethylation using NaAlO2 as a highly active heterogeneous catalyst

2018 ◽  
Author(s):  
Sreerangappa Ramesh ◽  
Kiran Indukuri ◽  
Olivier Riant ◽  
Damien Debecker
Keyword(s):  
Heterogeneous Catalyst ◽  
Dimethyl Carbonate ◽  
Sodium Aluminate ◽  
High Yield ◽  
Solid Catalyst ◽  
Highly Active ◽  
Aromatic Alcohols ◽  
Green Conditions ◽  
Mixed Carbonate

<p>Sodium aluminate is presented as a highly active heterogeneous catalyst able to convert a range of alcohols into the corresponding mixed carbonate esters, in high yield and under green conditions. The reaction is carried out using dimethyl carbonate both as a reactant and solvent, at 90°C. Allylic, aliphatic and aromatic alcohols are converted in good yields. The solid catalyst is shown to be truly heterogeneous, resistant to leaching, and recyclable. </p>

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