Dimeric assemblies of lanthanide-stabilised dilacunary Keggin tungstogermanates: A new class of catalysts for the selective oxidation of aniline

by / Wednesday, 25 November 2015 / Published in

Dimeric assemblies of lanthanide-stabilised dilacunary Keggin tungstogermanates: A new class of catalysts for the selective oxidation of aniline


Published in: Journal of Catalysis, 331, 110-117
2015/11/01
Publisher URL: http://www.sciencedirect.com/science/article/pii/S0021951715002961
DOI: http://doi.org/10.1016/j.jcat.2015.09.004 Authors:
Guido Trautwein Bouchra El Bakkali Juan Alcañiz-Monge Beñat Artetxe Santiago Reinoso Juan M. Gutiérrez-Zorrilla
Abstract:

In this work we demonstrate the efficiency of some dimeric [Ln4(H2O)6(?-GeW10O38)2]12? anions composed of lanthanide-stabilised dilacunary Keggin tungstogermanate fragments (??-Ln4, Ln = Dy, Ho, Er, Tm) as heterogeneous catalysts for the organic phase oxidation of aniline with hydrogen peroxide. The results obtained evidence total conversion of aniline at room temperature, as well as full selectivity towards nitrosobenzene, and the catalysts are able to retain both their activity and selectivity after several runs. Peroxopolyoxometalate intermediaries have been identified as the catalytically active species during the aniline-to-nitrosobenzene oxidation process.

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