Separation technology meets green chemistry: development of magnetically recoverable catalyst supports containing silica, ceria, and titania

2018 ◽  
Vol 90 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Lucas L. R. Vono ◽  
Camila C. Damasceno ◽  
Jivaldo R. Matos ◽  
Renato F. Jardim ◽  
Richard Landers ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Iron Oxides ◽  
Supported Catalysts ◽  
Green Technology ◽  
Catalyst Supports ◽  
Chemistry Development ◽  
Recoverable Catalyst ◽  
Carbon Coated ◽  
Iron Oxide Core ◽  
Magnetically Recoverable Catalyst

AbstractMagnetic separation can be considered a green technology because it is fast, efficient, consumes low energy, and minimizes the use of solvents and the generation of waste. It has been successfully used in laboratory scale to facilitate supported catalysts’ handling, separation, recovery, and recycling. Only few materials are intrisically magnetic, hence the application of magnetic materials as catalyst supports has broaden the use of magnetic separation. Iron oxides, silica-coated iron oxides, and carbon-coated-cobalt are among the most studied catalyst supports; however, other metal oxide coatings, such as ceria and titania, are also very interesting for application in catalysis. Here we report the preparation of magnetically recoverable magnetic supports containing silica, ceria, and titania. We found that the silica shell protects the iron oxide core and allows the crystalization of ceria and titania at high temperature without compromising the magnetic properties of the catalyst supports.

Hierarchical Magnetite/Silica Nanoassemblies as Magnetically Recoverable Catalyst–Supports

Nano Letters ◽  
2008 ◽  
Vol 8 (3) ◽  
pp. 931-934 ◽  
Author(s):  
Jianping Ge ◽  
Tuan Huynh ◽  
Yongxing Hu ◽  
Yadong Yin
Keyword(s):  
Catalyst Supports ◽  
Recoverable Catalyst ◽  
Magnetically Recoverable Catalyst

Cu-Fe Spinels: First Heterogeneous and Magnetically Recoverable Catalyst for the Ferrier Rearrangement of 2-Nitroglycals

2019 ◽  
Vol 16 (6) ◽  
pp. 447-453 ◽  
Author(s):  
Leticia Lafuente ◽  
María Florencia Rochetti ◽  
Rodolfo Bravo ◽  
Leandro Sasiambarrena ◽  
Cintia C. Santiago ◽  
...  
Keyword(s):  
Reaction Products ◽  
External Magnet ◽  
Recoverable Catalyst ◽  
Ferrier Rearrangement ◽  
Magnetically Recoverable Catalyst

Cu-Fe spinels promoted the Ferrier rearrangement of 2-nitroglycals with several O-nucleophiles. 2,3-Unsaturated carbohydrate derivatives were prepared by the reaction of 3,4,6-tri-Oacetyl- 2-nitroglucal and alcohols in the presence of 5 % of CuFe2O4. After separation of the catalyst with an external magnet, the reaction products were obtained in good yields and high stereo and regioselectivity. Also, S- and heterocyclic C-3 substituted 2-nitro-endo-glycals could be prepared by this method.

scholarly journals Magnetically recoverable nanostructured Pd complex of dendrimeric type ligand on the MCM-41: Preparation, characterization and catalytic activity in the Heck reaction

2020 ◽  
Vol 43 (1) ◽  
pp. 184-199
Author(s):  
Mohammad Abdollahi-Alibeik ◽  
Najmeh Gharibpour ◽  
Zahra Ramazani
Keyword(s):  
Heck Reaction ◽  
Palladium Complex ◽  
Nanostructured Material ◽  
Magnetic Core ◽  
Aryl Halides ◽  
Heterogeneous Samples ◽  
Recoverable Catalyst ◽  
Ft Ir ◽  
Magnetically Recoverable Catalyst ◽  
Mcm 41

AbstractA palladium complex of a dendrimer type ligand of aminoethylacrylamide immobilized onto the mesoporous channels of MCM-41 with magnetic core was prepared and characterized using various techniques such as XRD, TEM, BET, FT-IR, TGA, and VSM. The prepared nanostructured material was found as a magnetically recoverable catalyst for Heck reaction of aryl halides and vinylic C–H. The catalyst is easily recoverable with an external magnet and is reusable with different leaching amounts depending to loading of Pd. A hot filtration test was also performed and gave evidence that Palladium in heterogeneous samples can dissolve and then redeposit on the surface of the support material.

scholarly journals Synthesis of Bis(indolyl)methanes Using Fe3O4 Nanoparticle as a Robust, Efficient and Magnetically Recoverable Catalyst Under Solvent-Free Conditions

2018 ◽  
Vol 10 (5) ◽  
pp. 1591-1606 ◽  
Author(s):  
Julia C. M. Willig ◽  
Alexandra A. Amaral ◽  
Jamal Rafique ◽  
Sumbal Saba ◽  
Stefany Valiati ◽  
...  
Keyword(s):  
Solvent Free ◽  
Fe3o4 Nanoparticle ◽  
Recoverable Catalyst ◽  
Solvent Free Conditions ◽  
Magnetically Recoverable Catalyst

scholarly journals Evaluation of Magnetic Separation Efficiency on a Cassiterite-Bearing Skarn Ore by Means of Integrative SEM-Based Image and XRF–XRD Data Analysis

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 390 ◽  
Author(s):  
Markus Buchmann ◽  
Edgar Schach ◽  
Raimon Tolosana-Delgado ◽  
Thomas Leißner ◽  
Jennifer Astoveza ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Iron Oxides ◽  
Separation Efficiency ◽  
Analysis Data ◽  
Gangue Mineral ◽  
Data Partition ◽  
Local Regression ◽  
Separation Processes ◽  
Magnetic Separator

Image analysis data obtained from scanning electron microscopy provided data for a detailed evaluation of the separation efficiency for various processes involving the beneficiation of particulate materials. A dry magnetic separation by a drum type magnetic separator served as a case study to visualize effects of processing of a skarn ore with a high content of cassiterite as ore mineral (~4 wt%). For this material, iron oxides and silicates are the main gangue mineral groups. Based on the obtained data, partition curves were generated with the help of local regression. From the partition curves, the separation efficiency was evaluated and the relevant particle properties deduced. A detailed analysis of the bias of the quantitative mineralogical data is presented. This bias was monitored and further analyzed in detail. Thorough analysis of feed and products of magnetic separation enabled identification of the most important factors that control losses of cassiterite to the magnetic product, namely the association with iron oxides and particle sizes below ~40 µm. The introduced methodology is a general approach applicable for the optimization of different separation processes and is not limited to the presented case study.

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