14236-12-5Relevant articles and documents
Production of compounds to be used as fuel additive: Glycerol conversion using Nb-doped MgAl mixed oxide
Souza, Juber,Souza, Priscila M.T.G.,De Souza, Patterson P.,Sangiorge, Daniel L.,Pasa, Vanya M.D.,Oliveira, Luiz C.A.
, p. 65 - 72 (2013)
MgAl mixed oxide from hydrotalcite was modified with niobium and evaluated as a catalyst for a liquid-phase glycerol conversion in the presence of hydrogen peroxide. Niobium oxide exhibited high activity for glycerol conversion via heterogeneous catalysis at 250 C. Gas chromatography with mass spectrometry (GC-MS) analysis of the reaction showed that diglycerol, ethers and ketone were the main products. The results strongly suggest that the glycerol conversion involves acid groups and oxidizing species generated upon reacting with H 2O2 and niobium. Furthermore, catalytic tests monitored by electrospray mass spectrometry (ESI-MS) suggest that ethers, such as di, tri and tetra glycerols, are formed during the glycerol condensation (m/z = 167, 223, 241, and 315). Preliminary tests using the reaction products as additives for gasoline demonstrate that the octane is increased due to the presence of ether formed from glycerol conversion.
V- or Mo-modified niobium catalysts for glycerin conversion reactions in the presence of H2O2
Souza, Juber P.,Melo, Thaís,De Oliveira, Marcone A.L.,Paniago, Roberto M.,De Souza, Patterson P.,Oliveira, Luiz C.A.
, p. 153 - 160 (2012/11/13)
In the present work, amorphous niobium oxides with 5% (w/w) vanadium or molybdenum isomorphically substituted into the material structure were synthesized. The materials were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results show that vanadium and molybdenum were incorporated into the niobium oxide structure with concomitant changes in the morphologic and catalytic properties. Catalytic studies on the conversion of residual glycerin generated during biodiesel production in the presence of H2O2 showed enhanced efficiency of ether formation with the vanadium-containing material. The NbV/ethanol/glycerin/250 °C system was found to convert 80% of glycerin. Experiment-planning studies in conjunction with the analysis of the surface response via gas chromatography-mass spectrometry (GC-MS) aided in the determination of the optimal conditions. The catalytic tests monitored by GC-MS showed the formation a mixture of ethers obtained by the condensation of glycerol. Furthermore, it was observed that the modification of the catalyst directs the formation of larger molecules such as ketone mainly in the catalyst containing vanadium.
Reaction of [Hydroxy(tosyloxy)iodo]benzene with 1,2-epoxy-3-furfuryloxypropane
Mirbagirova,Magerramov,Allakhverdiev
, p. 757 - 757 (2007/10/03)
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