Modified niobia as a bifunctional catalyst for simultaneous dehydration and oxidation of glycerol

Oliveira, Luiz C.A.; Portilho, Márcio F.; Silva, Adilson C.; Tarôco, Hosane Aparecida; Souza, Patterson P. de

doi:10.1016/j.apcatb.2011.12.043

Cited by 67 publications

(36 citation statements)

References 19 publications

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“…Raman spectroscopy was obtained at each 1 min interval (laser at 660 nm; 280 mW intensity) and using 32 scans per analysis. Raman spectroscopy experiments aimed to evaluate the thermal stability of the different catalysts after H 2 O 2 treatment were performed at 60 • C for 24 h and then analyzed every 4 h, following a literature procedure [89].…”

Section: Methodsmentioning

confidence: 99%

New Insights on the Oxidation of Unsaturated Fatty Acid Methyl Esters Catalyzed by Niobium(V) Oxide. A Study of the Catalyst Surface Reactivity

et al. 2018

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Abstract:The catalytic properties of niobium(V) oxide (Nb 2 O 5 -CBMN) of different grades: amorphous, optical and ultra-pure, untreated or heat-treated at 400, 500, 700 and 900 • C were studied, before and after interaction with H 2 O 2 , by in situ Raman, FTIR-ATR and diffuse reflectance UV-Visible spectroscopy. The presence of different reaction sites for NbO 7 and NbO 8 type systems, which are directly related to surface defects present in different states of crystallization, were fully characterized. The reactivity of different catalysts obtained from niobium(V) oxide was investigated, using the oxidation of methyl linoleate in the presence of hydrogen peroxide as probe reaction. The reaction was followed by GC-MS, as well as by 1 H and 13 C NMR spectrometry and the dominant product was 9-oxo-nonanoic acid methyl ester. A reaction mechanism related to an auto-oxidation process must be occurring, leading initially to the formation of hydroperoxides, which decompose rapidly via Hock-type rearrangement, leading to the formation of aldehydes.

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Section: Methodsmentioning

confidence: 99%

New Insights on the Oxidation of Unsaturated Fatty Acid Methyl Esters Catalyzed by Niobium(V) Oxide. A Study of the Catalyst Surface Reactivity

et al. 2018

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“…However, due to the high cost and easy catalyst deactivation of noble metal catalysts, the design of efficient transition metal catalysts was becoming a hot point in the current research area [1,[13][14][15][16][17][18][19][20]. Zhou et al reported that Cu-containing hydrotalcites were active catalysts in the selective oxidation of GLY to glyceric acid, and the highest yield reached 68% [1].…”

Section: Introductionmentioning

confidence: 99%

Base-Free Selective Oxidation of Glycerol over LDH Hosted Transition Metal Complexes Using 3% H2O2 as Oxidant

Wang

Shang

et al. 2016

Catalysts

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A series of transition metal sulphonato-Schiff base complexes were intercalated into Mg-Al layered-double hydroxides (LDHs). The obtained catalysts were characterized by FTIR, XRD, N 2 sorption, SEM and elemental analysis, and then were used in the selective oxidation of glycerol (GLY) using 3% H 2 O 2 as an oxidant. It was found that their catalytic performances were closely related to the loading of active complexes, the Schiff base ligands and the metal centers of the catalysts, as well as the reaction conditions. The optimal conversion of GLY was 85.0%, while the selectivity of 1,3-dihydroxyacetone (DHA) was 56.5%. Moreover, the catalysts could be reused at least 10 times.

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“…However, noble metal catalysts often suffered from the drawbacks of high cost and easy deactivation, so the design of effective low-cost transition metal catalysts attracted more and more attention in the past decade [1,6,[14][15][16][17][18]. Zhou et al found that Cu-containing layered double hydroxide (LDH) was effective for the selective oxidation of GLY by O2, and the main product was GLYAC with a yield of 68% [4].…”

Section: Methodsmentioning

confidence: 99%

Selective Oxidation of Glycerol with 3% H2O2 Catalyzed by LDH-Hosted Cr(III) Complex

Wang

Jiang

et al. 2015

Catalysts

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A series of layered double hydroxides (LDHs) -hosted sulphonato-salen Cr(III) complexes were prepared and characterized by various physico-chemical measurements, such as Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), powder X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM) and elemental analysis. Additionally, their catalytic performances were investigated in the selective oxidation of glycerol (GLY) using 3% H2O2 as an oxidant. It was found that all the LDH-hosted Cr(III) complexes exhibited significantly enhanced catalytic performance compared to the homogeneous Cr(III) complex. Additionally, it was worth mentioning that the metal composition of LDH plates played an important role in the catalytic performances of LDH-hosted Cr(III) complex catalysts. Under the optimal reaction conditions, the highest GLY conversion reached 85.5% with 59.3% of the selectivity to 1,3-dihydroxyacetone (DHA). In addition, the catalytic activity remained after being recycled five times.

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Modified niobia as a bifunctional catalyst for simultaneous dehydration and oxidation of glycerol

Cited by 67 publications

References 19 publications

New Insights on the Oxidation of Unsaturated Fatty Acid Methyl Esters Catalyzed by Niobium(V) Oxide. A Study of the Catalyst Surface Reactivity

New Insights on the Oxidation of Unsaturated Fatty Acid Methyl Esters Catalyzed by Niobium(V) Oxide. A Study of the Catalyst Surface Reactivity

Base-Free Selective Oxidation of Glycerol over LDH Hosted Transition Metal Complexes Using 3% H2O2 as Oxidant

Selective Oxidation of Glycerol with 3% H2O2 Catalyzed by LDH-Hosted Cr(III) Complex

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