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 Influence of Bi–Fe additive on properties of vanadium phosphate catalysts for n-butane oxidation to maleic anhydride

2008 ◽  
Vol 131 (1-4) ◽  
pp. 408-412 ◽  
Author(s):  
C.K. Goh ◽  
Y.H. Taufiq-Yap ◽  
G.J. Hutchings ◽  
N. Dummer ◽  
J. Bartley
Keyword(s):  
Maleic Anhydride ◽  
Butane Oxidation ◽  
Vanadium Phosphate

Butane oxidation to maleic anhydride over vanadium phosphate catalysts

1987 ◽  
Vol 1 (1-2) ◽  
pp. 49-58 ◽  
Author(s):  
R.M. Contractor ◽  
H.E. Bergna ◽  
H.S. Horowitz ◽  
C.M. Blackstone ◽  
B. Malone ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Butane Oxidation ◽  
Vanadium Phosphate

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.

Deactivation of arenetitanium(II) bromoalane complexes in the cyclotrimerization of butadiene

1986 ◽  
Vol 51 (12) ◽  
pp. 2751-2759 ◽  
Author(s):  
Jindřich Poláček ◽  
Helena Antropiusová ◽  
Lidmila Petrusová ◽  
Karel Mach
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Model System ◽  
Highly Active ◽  
Catalytic Stability

The C6H6.Ti(II)(AlBr4)2 (Ib) catalyst deactivates during the butadiene cyclotrimerization to give a solid containing all titanium (mostly as TiBr3) and a mixture of AlBr3 and RAlBr2 compounds dissolved in benzene. The residual cationic catalytic activity of the deactivated Ib system is due to presence of AlBr3. In contrast to TiCl3, the deactivated Ib system and the model system TiBr3 + AlBr3 are not activated by the addition of EtAlCl2 in the presence of butadiene: the highly active benzenetitanium(II) system is re-constituted only after reduction of TiBr3 with Et3Al followed by the addition of EtAlCl2. The addition of Et2AlBr to Ib accelerates the deactivation of the system. Deactivation products of this system contain mainly Ti(II) species which forms benzenetitanium(II) catalytic system after addition of EtAlCl2. All the EtAlCl2 reactivated systems produce (Z, E, E)-1,5,9-cyclododecatriene with high catalytic stability and considerable selectivity (>90%). This behaviour points to the catalysis by benzenetitanium(II) chloroalane complexes containing only low amount of bromine atoms and ethyl groups.

scholarly journals Ring-Opening Copolymerization of Cyclohexene Oxide and Cyclic Anhydrides Catalyzed by Bimetallic Scorpionate Zinc Catalysts

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1651
Author(s):  
Felipe de la Cruz-Martínez ◽  
Marc Martínez de Sarasa Buchaca ◽  
Almudena del Campo-Balguerías ◽  
Juan Fernández-Baeza ◽  
Luis F. Sánchez-Barba ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Mechanism ◽  
Catalytic System ◽  
Phthalic Anhydride ◽  
Ring Opening ◽  
High Selectivity ◽  
Zinc Complexes ◽  
Cyclohexene Oxide ◽  
Reaction Conditions ◽  
Cyclic Anhydrides

The catalytic activity and high selectivity reported by bimetallic heteroscorpionate acetate zinc complexes in ring-opening copolymerization (ROCOP) reactions involving CO2 as substrate encouraged us to expand their use as catalysts for ROCOP of cyclohexene oxide (CHO) and cyclic anhydrides. Among the catalysts tested for the ROCOP of CHO and phthalic anhydride at different reaction conditions, the most active catalytic system was the combination of complex 3 with bis(triphenylphosphine)iminium as cocatalyst in toluene at 80 °C. Once the optimal catalytic system was determined, the scope in terms of other cyclic anhydrides was broadened. The catalytic system was capable of copolymerizing selectively and efficiently CHO with phthalic, maleic, succinic and naphthalic anhydrides to afford the corresponding polyester materials. The polyesters obtained were characterized by spectroscopic, spectrometric, and calorimetric techniques. Finally, the reaction mechanism of the catalytic system was proposed based on stoichiometric reactions.

ChemInform Abstract: Catalyzing Butane Oxidation to Make Maleic Anhydride

ChemInform ◽  
2010 ◽  
Vol 25 (34) ◽  
pp. no-no ◽  
Author(s):  
F. CAVANI ◽  
F. TRIFIRO
Keyword(s):  
Maleic Anhydride ◽  
Butane Oxidation
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