scholarly journals Selective Catalytic Oxidation of Benzyl Alcohol by MoO2 Nanoparticles

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 265 ◽  
Author(s):  
Filipe Gaspar ◽  
Carla D. Nunes

Selective oxidation of benzyl alcohol to benzaldehyde was carried out with MoO2 nanoparticles (MoO2 NPs). MoO2 NPs were synthesized by two different approaches and characterized by several techniques. The synthesis was done by a hydrothermal procedure using ethylenediamine and either Fe2O3 or hydroquinone. In the latter case, an additional calcination step under N2 was performed to eliminate passivating agents at the surface of the nanoparticles. The synthesized nanocatalysts showed similar catalytic properties, being efficient catalysts in the oxidation of benzyl alcohol. High substrate conversion and product selectivity were achieved under all tested conditions. Studies were conducted using two different oxidants: tert-butyl hydroperoxide and hydrogen peroxide, in our continuous effort to obtain more efficient catalysts for more sustainable catalytic processes. When H2O2 was used as the oxidant, 94% yield was achieved with 100% selectivity for benzaldehyde, which was a very promising result to undergo other studies with this system. Moreover, to elucidate some aspects of the reaction mechanism, a study was conducted, and it was possible to conclude that the reaction undergoes, to some extent, through a radical mechanism with both oxidants.

2020 ◽  
Vol 8 ◽  
Author(s):  
Shurui Xu ◽  
Jie Wu ◽  
Peng Huang ◽  
Chunwen Lao ◽  
Hanchao Lai ◽  
...  

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
Nhu Nguyen Thi ◽  
Mai Tran Thi Ngoc ◽  
Khanh Pham Quoc ◽  
Tuan Vu Anh ◽  
Thao Nguyen Tien

CoOx/magenium silicate catalysts are obtained though precipitation and calcination method. The prepared solids were analyzed by XRD, BET, EDS... Cobalt(II) ions supported-magnesium silicate catalysts expressed as effective catalysts for selective oxidation of benzyl alcohol using tert-butyl hydroperoxide as an oxidizing agent. The experimental results  showed very high selectivity to the benzaldehyde product at benzyl alcohol conversion of 18-25%.


2019 ◽  
Vol 48 (17) ◽  
pp. 5831-5841
Author(s):  
Feng-Cai Li ◽  
Li-Kun Tan ◽  
Xi-Li Li ◽  
Hua-Jie Kong ◽  
Li-Ming Ge ◽  
...  

Two 3D Evans–Showell-type POM-based different transition metals–bis-pyrazine–bis-amide complexes act as heterogeneous catalysts for the oxidation of benzyl alcohol.


2019 ◽  
Vol 48 (15) ◽  
pp. 4830-4836 ◽  
Author(s):  
Elodie Chevallot-Beroux ◽  
Ayuk M. Ako ◽  
Wolfgang Schmitt ◽  
Brendan Twamley ◽  
Joseph Moran ◽  
...  

We report the synthesis, structural characterisation, electrochemistry and catalytic activity in the selective oxidation of benzyl alcohol of new Mn19 and Mn18M analogues: [MnIII12MnII7(μ4-O)8(μ3-OCH3)2(μ3-Br)6(HLMe)12(MeOH)6]Br2 (2) and [MnIII12MnII6Sr(μ4-O8(μ3-Cl)8(HLMe)12(MeCN)6]Cl2 cluster (3), where H3LMe is 2,6-bis(hydroxymethyl)-p-cresol.


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