Selective Catalytic Oxidation of Benzyl Alcohol by MoO2 Nanoparticles

Catalysts

CarlaD. Nunes¹  Filipe Gaspar¹ 

[1] Centro de Química Estrutural, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal;

关键词: moo₂ nanoparticles;    green catalysis;    oxidation;    hydrogen peroxide;    benzyl alcohol;   

DOI  :  10.3390/catal10020265

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown