scholarly journals K-10 montmorillonite: An efficient and reusable catalyst for selective oxidation of aldehydes in the presence of dioxygen

2019 ◽  
Vol 8 (5) ◽  
pp. 380-389
Author(s):  
Ikram EL Amrani ◽  
Ahmed Atlamsani
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Selective Oxidation ◽  
Reusable Catalyst ◽  
Good Activity ◽  
Mild Conditions ◽  
Catalyst Temperature ◽  
Clay Catalyst ◽  
Excellent Selectivity

A commercial montmorillonite clay catalyst, K-10 montmorillonite, was tested for catalytic oxidation of aldehydes in the presence of molecular oxygen under mild conditions. K-10 montmorillonite catalysed the oxidation of aldehydes with good activity and excellent selectivity toward the formation of the corresponding acids. The effects of the amount of catalyst, temperature and solvent on the catalytic activity were investigated. Remarkably, this catalyst was reusable without any appreciable loss in activity and selectivity.

scholarly journals Novel Effect of Zinc Nitrate/Vanadyl Oxalate for Selective Catalytic Oxidation of α-Hydroxy Esters to α-Keto Esters with Molecular Oxygen: An In Situ ATR-IR Study

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1281 ◽  
Author(s):  
Yongwei Ju ◽  
Zhongtian Du ◽  
Chuhong Xiao ◽  
Xingfei Li ◽  
Shuang Li
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Aerobic Oxidation ◽  
Value Added ◽  
Attenuated Total Reflection ◽  
Reaction Conditions ◽  
Keto Esters ◽  
Selective Catalytic Oxidation ◽  
Hydroxy Esters

Selective oxidation of α-hydroxy esters is one of the most important methods to prepare high value-added α-keto esters. An efficient catalytic system consisting of Zn(NO3)2/VOC2O4 is reported for catalytic oxidation of α-hydroxy esters with molecular oxygen. Up to 99% conversion of methyl DL-mandelate or methyl lactate could be facilely obtained with high selectivity for its corresponding α-keto ester under mild reaction conditions. Zn(NO3)2 exhibited higher catalytic activity in combination with VOC2O4 compared with Fe(NO3)3 and different nitric oxidative gases were detected by situ attenuated total reflection infrared (ATR-IR) spectroscopy. UV-vis and ATR-IR results indicated that coordination complex formed in Zn(NO3)2 in CH3CN solution was quite different from Fe(NO3)3; it is proposed that the charge-transfer from Zn2+ to coordinated nitrate groups might account for the generation of different nitric oxidative gases. The XPS result indicate that nitric oxidative gas derived from the interaction of Zn(NO3)2 with VOC2O4 could be in favor of oxidizing VOC2O4 to generate active vanadium (V) species. It might account for different catalytic activity of Zn(NO3)2 or Fe(NO3)3 combined with VOC2O4. This work contributes to further development of efficient aerobic oxidation under mild reaction conditions.

Biomimetic flavin-catalysed reactions for organic synthesis

2015 ◽  
Vol 13 (28) ◽  
pp. 7599-7613 ◽  
Author(s):  
H. Iida ◽  
Y. Imada ◽  
S.-I. Murahashi
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Organic Synthesis ◽  
Environmentally Benign ◽  
Wide Scope ◽  
Biomimetic Catalysts ◽  
Mild Conditions ◽  
Related Compounds

Using simple riboflavin related compounds as biomimetic catalysts, catalytic oxidation of various substrates with hydrogen peroxide or molecular oxygen can be performed selectively under mild conditions. The principle of these reactions is fundamental and will provide a wide scope for environmentally benign future practical methods.

Catalytic oxidation of aromatic amines to azoxy compounds over a Cu–CeO2 catalyst using H2O2 as an oxidant

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22812-22820 ◽  
Author(s):  
Astha Shukla ◽  
Rajib Kumar Singha ◽  
L. N. Sivakumar Konathala ◽  
Takehiko Sasaki ◽  
Rajaram Bal
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Selective Oxidation ◽  
Aromatic Amines ◽  
Cu Nanoparticles ◽  
Azoxy Compounds ◽  
Highly Dispersed ◽  
Good Catalytic Activity

Highly dispersed Cu-nanoparticles supported on nanocrystalline CeO2 were prepared which showed good catalytic activity toward selective oxidation of aromatic amines.

Selective Oxidation of 1,2-Propanediol to Lactic Acid over Different Supported Au, Pt and Pd Catalysts

2019 ◽  
Vol 800 ◽  
pp. 88-92 ◽  
Author(s):  
Svetlana Chornaja ◽  
Svetlana Zhizhkuna ◽  
Jevgenija Vladiko ◽  
Konstantins Dubencovs
Keyword(s):  
Lactic Acid ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Heterogeneous Catalyst ◽  
Selective Oxidation ◽  
Main Product ◽  
Oxidation Process ◽  
Pd Catalysts ◽  
Oxidation With Molecular Oxygen ◽  
By Products

1,2-Propanediol selective oxidation with molecular oxygen in presence of heterogeneous catalyst is one of the most nature friendly 1,2-propanediol conversion methods. This work demonstrates Au, Pt and Pd containing catalysts’ activity and selectivity in a 1,2-propanediol oxidation process. The main product of the 1,2-propanediol catalytic oxidation was lactic acid, by-products were acetic and formic acids. It was found that Au based catalysts are best for 1,2-propanediol oxidation in alkaline water solutions. The best result was achieved using the 4.8wt%Au/Al2O3catalyst: selectivity by lactic acid was 94% with 1,2-propanediol conversion 100% (c0(1,2-propanediol) = 0.3 mol/L, P(O2) = 6 atm, n (1,2-propanediol)/n (Au) = 500, t = 60°C, c0(NaOH) = 1.5 mol/L).

Supported gold nanoparticles as a reusable catalyst for synthesis of lactones from diols using molecular oxygen as an oxidant under mild conditions

2009 ◽  
Vol 11 (6) ◽  
pp. 793 ◽  
Author(s):  
Takato Mitsudome ◽  
Akifumi Noujima ◽  
Tomoo Mizugaki ◽  
Koichiro Jitsukawa ◽  
Kiyotomi Kaneda
Keyword(s):  
Gold Nanoparticles ◽  
Molecular Oxygen ◽  
Reusable Catalyst ◽  
Mild Conditions ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

An efficient approach for enhancing the catalytic activity of Ni-MOF-74 via a relay catalyst system for the selective oxidation of benzylic C–H bonds under mild conditions

2018 ◽  
Vol 54 (30) ◽  
pp. 3701-3704 ◽  
Author(s):  
Changyan Guo ◽  
Yonghong Zhang ◽  
Yi Zhang ◽  
Jide Wang
Keyword(s):  
Catalytic Activity ◽  
Selective Oxidation ◽  
Catalyst System ◽  
Efficient Approach ◽  
Mild Conditions

A facile and efficient approach for enhancing the catalytic activity of Ni-MOF-74 via a relay catalysis strategy with [bmim]Br was developed, which is excellent for the selective oxidation of benzylic C–H bond under mild conditions.

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