scholarly journals Poly(imidazolium) Carbosilane Dendrimers: Synthesis, Catalytic Activity in Redox Esterification of α,β-Unsaturated Aldehydes and Recycling via Organic Solvent Nanofiltration

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1317
Author(s):  
Alena Krupková ◽  
Klára Kubátová ◽  
Lucie Červenková Šťastná ◽  
Petra Cuřínová ◽  
Monika Müllerová ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Organic Solvent ◽  
Carbosilane Dendrimers ◽  
Primary Alcohols ◽  
Unsaturated Aldehydes ◽  
Substrate Structure ◽  
Improved Performance ◽  
Organic Solvent Nanofiltration ◽  
Catalytic Cycles

Three series of poly(ionic) carbosilane dendrimers peripherally functionalized with imidazolium groups substituted on N-3 with methyl, isopropyl and 2,6-diisopropylphenyl (Dipp) were prepared up to the 3rd generation together with model monovalent imidazolium iodides and used as N-heterocyclic carbene (NHC) precursors. Catalytic activity of model and dendritic NHCs generated in situ by deprotonation with DBU was tested in redox esterification of α,β-unsaturated aldehydes and the influence of substitution, dendrimer generation, temperature and substrate structure on the reaction outcome was evaluated. Dipp substituted NHCs showed high activity and selectivity in the reaction with primary alcohols. Effectiveness of organic solvent nanofiltration for the recycling of dendritic NHCs was demonstrated on the 1st generation Dipp substituted catalyst in model redox esterification of cinnamaldehyde with benzyl alcohol. A marked increase in both activity and selectivity in the first four reaction runs was observed and this improved performance was preserved in the following catalytic cycles.

A high flux organic solvent nanofiltration membrane from Kevlar aramid nanofibers with in situ incorporation of microspheres

2018 ◽  
Vol 6 (45) ◽  
pp. 22987-22997 ◽  
Author(s):  
Yi Li ◽  
Shushan Yuan ◽  
Chen Zhou ◽  
Yan Zhao ◽  
Bart Van der Bruggen
Keyword(s):  
Organic Solvent ◽  
High Flux ◽  
Nanofiltration Membrane ◽  
Organic Solvent Nanofiltration

Fabrication of a high flux organic solvent nanofiltration (OSN) membrane from aramid nanofibers (ANFs) with in situ incorporation of ANF/polyethyleneimine (PEI) microspheres.

Aromatic porous polymer network membranes for organic solvent nanofiltration under extreme conditions

2020 ◽  
Vol 8 (31) ◽  
pp. 15891-15899 ◽  
Author(s):  
Chenxu Wang ◽  
Chenxuan Li ◽  
Evan R. C. Rutledge ◽  
Sai Che ◽  
Jongbok Lee ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Polymer Network ◽  
Polymer Networks ◽  
Porous Polymer ◽  
Cross Linking ◽  
High Permeability ◽  
Organic Solvent Nanofiltration ◽  
Molecular Sieving ◽  
Excellent Chemical

Organic solvent nanofiltration (OSN) membranes composed of aromatic porous polymer networks are fabricated by in situ cross-linking. They exhibit excellent chemical/structural stability, molecular-sieving selectivity, and high permeability for OSN.

In-situ growth of double-layered polyaniline composite membrane for organic solvent nanofiltration

2021 ◽  
Vol 420 ◽  
pp. 129338
Author(s):  
Pengpeng He ◽  
Song Zhao ◽  
Chenyue Mao ◽  
Ying Wang ◽  
Guangqing Ma ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Composite Membrane ◽  
In Situ Growth ◽  
Organic Solvent Nanofiltration

In Situ Solvent Recovery by Organic Solvent Nanofiltration

2014 ◽  
Vol 2 (10) ◽  
pp. 2371-2379 ◽  
Author(s):  
Jeong F. Kim ◽  
Gyorgy Szekely ◽  
Marc Schaepertoens ◽  
Irina B. Valtcheva ◽  
Maria F. Jimenez-Solomon ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Solvent Recovery ◽  
Organic Solvent Nanofiltration

In situ synthesis of ultra-small platinum nanoparticles using a water soluble polyphenolic polymer with high catalytic activity

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51745-51753 ◽  
Author(s):  
Tanmoy Maji ◽  
Sanjib Banerjee ◽  
Mrinmoy Biswas ◽  
Tarun K. Mandal
Keyword(s):  
Catalytic Activity ◽  
Organic Solvent ◽  
Platinum Nanoparticles ◽  
In Situ Synthesis ◽  
Reduction Technique ◽  
Water Soluble ◽  
High Catalytic Activity

Ultra-small platinum nanoparticles are generated by in situ polymer reduction technique which shows high catalytic activity in water and in organic solvent.

scholarly journals Polysulfone/Polyamide-SiO2 Composite Membrane with High Permeance for Organic Solvent Nanofiltration

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 89 ◽  
Author(s):  
Qin Liu ◽  
Xing Wu ◽  
Kaisong Zhang
Keyword(s):  
Surface Roughness ◽  
Organic Solvent ◽  
Composite Membrane ◽  
Interfacial Polymerization ◽  
Composite Membranes ◽  
Polymerization Process ◽  
Nanoporous Silica ◽  
Improved Performance ◽  
Major Factors ◽  
Organic Solvent Nanofiltration

To improve the filtration performance and properties of organic solvent nanofiltration (OSN) membranes, we firstly introduce nanoporous silica (SiO2) particles into the polyamide (PA) active layer of polysulfone (PSf) membrane via an interfacial polymerization process. Results from the study revealed that introduction of SiO2 influenced the properties of PSf/PA-SiO2 composite membranes by changing the surface roughness and hydrophilicity. Moreover, results also indicated that nanoporous SiO2 modified membranes showed an improved performance of alcohols solvent permeance. The PSf/PA-SiO2 composite membrane modified by 0.025 wt % of SiO2 reached a permeance of 3.29 L m−2 h−1 bar−1 for methanol and 0.42 L m−2 h−1 bar−1 for ethanol, which were 20.0% and 13.5% higher than the control PSf membrane (permeance of 2.74 L m−2 h−1 bar−1 for methanol and 0.37 L m−2 h−1 bar−1 for ethanol). Conclusively, we demonstrated that the increase of membrane hydrophilicity and roughness were major factors contributing to the improved alcohols solvent permeance of the membranes.

In situ growth of a tubular MoS2 membrane on a ceramic tube with improved organic solvent nanofiltration performance

2021 ◽  
Vol 5 (7) ◽  
pp. 3184-3191
Author(s):  
Tongtong Liu ◽  
Zhenping Qin ◽  
Qiaohong Liu ◽  
Xuejian Li ◽  
Yue Liu ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Hydrothermal Method ◽  
High Stability ◽  
Ceramic Membrane ◽  
In Situ Growth ◽  
Ceramic Tube ◽  
Organic Solvent Nanofiltration

A MoS2 tubular ceramic membrane was prepared successfully via a straightforward in situ hydrothermal method and demonstrated excellent organic solvent nanofiltration properties and high stability.

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