scholarly journals Degradation of Proteins and Starch by Combined Immobilization of Protease, α-Amylase and β-Galactosidase on a Single Electrospun Nanofibrous Membrane

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 508 ◽  
Author(s):  
William Cloete ◽  
Stefan Hayward ◽  
Pieter Swart ◽  
Bert Klumperman
Keyword(s):  
Catalytic Activity ◽  
Maleic Anhydride ◽  
Nanofibrous Membrane ◽  
Universal Method ◽  
Polymer Backbone ◽  
Nanofiber Mats ◽  
Partial Retention

Two commercially available enzymes, Dextrozyme (α-amylase) and Esperase (protease), were covalently immobilized on non-woven electrospun poly(styrene-co-maleic anhydride) nanofiber mats with partial retention of their catalytic activity. Immobilization was achieved for the enzymes on their own as well as in different combinations with an additional enzyme, β-galactosidase, on the same non-woven nanofiber mat. This experiment yielded a universal method for immobilizing different combinations of enzymes with nanofibrous mats containing maleic anhydride (MAnh) residues in the polymer backbone.

Electrospun poly(styrene-co-maleic anhydride) nanofibrous membrane: A versatile platform for mixed mode membrane adsorbers

2019 ◽  
Vol 484 ◽  
pp. 62-71 ◽  
Author(s):  
Jianlong Ye ◽  
Xushan Wang ◽  
Jiachen Chu ◽  
Dongxue Yao ◽  
Yufeng Zhang ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Mixed Mode ◽  
Nanofibrous Membrane ◽  
Membrane Adsorbers

Synthesis of polyhydroquinolines and 2-amino-4H-chromenes and their alkylene bridging derivatives using Sulfonic acid functionalized heterogeneous nanocatalyst based on modified poly (styrene-alt-maleic anhydride)

2021 ◽  
Vol 18 ◽  
Author(s):  
Shefa Mirani Nezhad ◽  
Seied Ali Pourmousavi ◽  
Ehsan Nazarzadeh Zare
Keyword(s):  
Catalytic Activity ◽  
Ir Spectroscopy ◽  
Maleic Anhydride ◽  
Sulfonic Acid ◽  
Chlorosulfonic Acid ◽  
Heterogeneous Nanocatalyst ◽  
High Acidity ◽  
Hantzsch Condensation ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

: A highly efficient heterogeneous nanocatalyst based on modified poly (styrene-alt-maleic anhydride) (MPSAMA) in three steps was fabricated. Then, the MPSAMA surface was modified using chlorosulfonic acid (CAS) to achieve a sulfonated MPSAMA (SMPSAMA) with high acidity and efficiency. FT-IR spectroscopy, CHNS analysis, FESEM, and TGA were employed to characterize the prepared nanocatalyst. The catalytic activity of the SMPSAMA was examined for the formation of the polyhydroquinoline derivatives through Hantzsch condensation and the synthesis of 2-amino-4H-chromene derivatives. This new heterogeneous nanocatalyst has been efficiently used for the synthesis of bifunctional bis polyhydroquinoline, and new alkylene bridging bis 2-amino-5-oxo-5,6,7,8-tetrahydro-4H-benzo[b]pyran derivatives.

Liquid-phase hydrogenation of maleic anhydride over Pd/SiO2: effect of tin on catalytic activity and deactivation

2003 ◽  
Vol 198 (1-2) ◽  
pp. 297-302 ◽  
Author(s):  
Seong Moon Jung ◽  
Eric Godard ◽  
Sang Yun Jung ◽  
Kwang-Cheon Park ◽  
Jung Uk Choi
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Maleic Anhydride ◽  
Liquid Phase Hydrogenation

Effect of the Method of Synthesis, Forming, and Activation on the Catalytic Activity of Vanadium-Phosphorus Catalysts

1993 ◽  
Vol 58 (5) ◽  
pp. 1007-1012 ◽  
Author(s):  
Milan Brutovský ◽  
Lucia Ferdinandyová ◽  
Štefan Gerej ◽  
Ján Novák
Keyword(s):  
Catalytic Activity ◽  
Phase Composition ◽  
Maleic Anhydride ◽  
Partial Oxidation ◽  
Temperature Regime ◽  
Catalytic Properties ◽  
Active Catalyst ◽  
Catalyst Activity ◽  
Gas Atmosphere ◽  
Condensed Phosphates

Methods where vanadium in the precursor is reduced to V4+ in solution are well suited to the synthesis of vanadium-phosphorus catalyst because the high temperatures (500 to 800 °C) required to transform the precursor to the active catalyst are thus avoid, which is desirable from the chemical as well as structuro-physical aspects. The way of forming and activating the catalyst, i.e. the temperature regime of the treatment and the kind of the gas atmosphere, were found to affect appreciably the catalyst activity in the partial oxidation of butane to maleic anhydride.. Forming procedures resulting in sufficiently fine crystals and optimized lattice defects are suitable. The application of synthesis, forming and activation procedures exhibiting a low tendency to form, in the catalyst phase composition, condensed phosphates such as VO(PO3)2 or even V(PO3)3 is also beneficial to the catalyst activity. The catalytic properties of the vanadium-phosphorus catalyst which was prepared in concentrated HCl were improved considerably by doping the lattice with modifying metal cations.

Catalytic activity of vanadyl phosphate supported on TiO2 (anatase) and SiO2 (silica)

1992 ◽  
Vol 70 (1) ◽  
pp. 5-13 ◽  
Author(s):  
M. Martinez-Lara ◽  
L. Moreno-Real ◽  
R. Pozas-Tormo ◽  
A. Jimenez-Lopez ◽  
S. Bruque ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Maleic Anhydride ◽  
Catalytic System ◽  
Silica Surface ◽  
Butane Oxidation ◽  
Vanadyl Phosphate ◽  
Vanadium Phosphate ◽  
Tio2 Anatase ◽  
Metallic Species

Oxidation of n-butane was investigated on vanadyl phosphate (VP) prepared in the presence of titania (anatase) and silica as supports. In the case of silica, α-VOPO4 was synthesized with no sign of interaction between the silica surface and vanadium phosphate. On the contrary, titania was coated with amorphous VP (P/V = 1), preventing the crystallization of VOPO4 at least up to the VP content of 21%. n-Butane was completely converted into CO2 for the VP/TiO2 catalytic system. Upon impregnation with metal sulfates, maleic anhydride (MA) was produced with selectivities depending on the nature of the added metallic species, the best effect being observed with Fe2+ (V/Fe = 3). Selectivities to MA were influenced by the P/V ratio, with a maximum at P/V = 1.2. Keywords: vanadyl phosphate, maleic anhydride, butane oxidation, anatase, rutile.

scholarly journals Rhodium-Catalyzed Aqueous Biphasic Olefin Hydroformylation Promoted by Amphiphilic Cyclodextrins

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 56 ◽  
Author(s):  
Aurélien Cocq ◽  
Hervé Bricout ◽  
Florence Djedaïni-Pilard ◽  
Sébastien Tilloy ◽  
Eric Monflier
Keyword(s):  
Mass Transfer ◽  
Catalytic Activity ◽  
Oleic Acid ◽  
Transition Metals ◽  
Maleic Anhydride ◽  
Catalytic System ◽  
Industrial Application ◽  
Industrial Process ◽  
Olefin Hydroformylation ◽  
Aqueous Biphasic

Hydroformylation is an industrial process that allows for the production of aldehydes from alkenes using transition metals. The reaction can be carried out in water, and the catalyst may be recycled at the end of the reaction. The industrial application of rhodium-catalyzed aqueous hydroformylation has been demonstrated for smaller olefins (propene and butene). Unfortunately, larger olefins are weakly soluble in water, which results in very low catalytic activity. In an attempt to counteract this, we investigated the use of amphiphilic oleic succinyl-cyclodextrins (OS-CDs) synthesized from oleic acid derivatives and maleic anhydride. OS-CDs were found to increase the catalytic activity of rhodium during the hydroformylation of water-insoluble olefins, such as 1-decene and 1-hexadecene, by promoting mass transfer. Recyclability of the catalytic system was also evaluated in the presence of these cyclodextrins.

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