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Ball milling as an effective method to prepare magnetically recoverable heterometallic catalysts for alcohol oxidation

Authors :
Elisabete C. B. A. Alegria
Roberta Bertani
Ana P. C. Ribeiro
Maximilian N. Kopylovich
Armando J. L. Pombeiro
Emmanuele Fontolan
Source :
Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
Publication Year :
2017
Publisher :
Elsevier BV, 2017.

Abstract

Heterometallic double Fe2O3–CoCl2, CoCl2–V2O5, MoO3–V2O5, and triple CuO–Fe2O3–CoCl2 3d metal dispersed systems were easily prepared by ball milling at room temperature and characterized by scanning electron microscopy (SEM), field emission gun scanning electron microscopy (FEGSEM), energydispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM). They catalyze the microwave-assisted solvent-free heterogeneous oxidation of 1-phenylethanol to acetophenone with tert-butyl hydroperoxide (t-BuOOH) as oxidant, used as a model reaction. In most of the heterometallic systems a significant improvement in the catalytic activity was observed in comparison to homometallic ones. For the tested catalytic systems and experimental conditions, the CuO–Fe2O3–CoCl2 and Fe2O3–CoCl2 systems exhibit the highest activity with maximum 78% yield and TON 39 after 1 h. The possibility of magnetic recovery of the catalysts was demonstrated for the Fe2O3–CoCl2 (3:1) system. info:eu-repo/semantics/publishedVersion

Details

ISSN :
00201693
Volume :
455
Database :
OpenAIRE
Journal :
Inorganica Chimica Acta
Accession number :
edsair.doi.dedup.....e1121f176be92a2c4e36b4cb928ccb51
Full Text :
https://doi.org/10.1016/j.ica.2016.04.042