Titanium containing inorganic–organic hybrid mesoporous materials with exceptional activity in epoxidation of alkenes using hydrogen peroxide

2002 ◽  
Vol 12 (10) ◽  
pp. 3078-3083 ◽  
Author(s):  
M. P. Kapoor ◽  
A. Bhaumik ◽  
S. Inagaki ◽  
K. Kuraoka ◽  
T. Yazawa
Keyword(s):  
Hydrogen Peroxide ◽  
Mesoporous Materials ◽  
Organic Hybrid ◽  
Hybrid Mesoporous Materials ◽  
Epoxidation Of Alkenes

Synthesis of Smart Mesoporous Materials

2003 ◽  
Vol 775 ◽  
Author(s):  
G.V.Rama Rao ◽  
Qiang Fu ◽  
Linnea K. Ista ◽  
Huifang Xu ◽  
S. Balamurugan ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Mesoporous Materials ◽  
Fluorescent Dyes ◽  
Thermo Gravimetric Analysis ◽  
Molecular Transport ◽  
Solute Diffusion ◽  
Gravimetric Analysis ◽  
Stimuli Responsive ◽  
Porous Network ◽  
Hybrid Mesoporous Materials

AbstractThis study details development of hybrid mesoporous materials in which molecular transport through mesopores can be precisely controlled and reversibly modulated. Mesoporous silica materials formed by surfactant templating were modified by surface initiated atom transfer radical polymerization of poly(N-isopropyl acrylamide) (PNIPAAm) a stimuli responsive polymer (SRP) within the porous network. Thermo gravimetric analysis and FTIR spectroscopy were used to confirm the presence of PNIPAAm on the silica surface. Nitrogen porosimetry, transmission electron microscopy and X-ray diffraction analyses confirmed that polymerization occurred uniformly within the porous network. Uptake and release of fluorescent dyes from the particles was monitored by spectrofluorimetry and scanning laser confocal microscopy. Results suggest that the presence of PNIPAAm, a SRP, in the porous network can be used to modulate the transport of aqueous solutes. At low temperature, (e.g., room temperature) the PNIPAAm is hydrated and extended and inhibits transport of analytes; at higher temperatures (e.g., 50°C) it is hydrophobic and is collapsed within the pore network, thus allowing solute diffusion into or out of the mesoporous silica. The transition form hydrophilic to hydrophobic state on polymer grafted mesoporous membranes was determined by contact angle measurements. This work has implications for the development of materials for the selective control of transport of molecular solutes in a variety of applications.

Stereoselective Epoxidation of Alkenes with Hydrogen Peroxide using a Bipyrrolidine‐Based Family of Manganese Complexes

2011 ◽  
Vol 354 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Isaac Garcia‐Bosch ◽  
Laura Gómez ◽  
Alfonso Polo ◽  
Xavi Ribas ◽  
Miquel Costas
Keyword(s):  
Hydrogen Peroxide ◽  
Manganese Complexes ◽  
Stereoselective Epoxidation ◽  
Epoxidation Of Alkenes

Mechanism of [γ-H2SiV2W10O40]4--Catalyzed Epoxidation of Alkenes with Hydrogen Peroxide

2007 ◽  
Vol 46 (5) ◽  
pp. 1727-1736 ◽  
Author(s):  
Yoshinao Nakagawa ◽  
Noritaka Mizuno
Keyword(s):  
Hydrogen Peroxide ◽  
Epoxidation Of Alkenes

Heterogeneous epoxidation of alkenes with H2O2 catalyzed by a recyclable organic–inorganic polyoxometalate-based framework catalyst

2015 ◽  
Vol 39 (12) ◽  
pp. 9879-9885 ◽  
Author(s):  
Hedayat Haddadi ◽  
Shahrbanou Moradpour Hafshejani ◽  
Mostafa Riahi Farsani ◽  
Ali Kazemi Babahydari
Keyword(s):  
Hydrogen Peroxide ◽  
Selective Oxidation ◽  
Stable Catalyst ◽  
Epoxidation Of Alkenes

PW-MOF as an efficient, recyclable and stable catalyst for the selective oxidation of alkenes with hydrogen peroxide.

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