Application of Al2O3/AlNbO4 in the oxidation of aniline to azoxybenzene
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Al2O3/AlNbO4 powder was fabricated by a facile high-energy milling process. The precursor materials, Al2O3 and Nb2O5, are readily available and have very attractive properties. Moreover, the catalytic activity of the sample in the liquid phase oxidation of aniline (OA) in the presence of hydrogen peroxide as oxidant was evaluated. The catalyst was found to be highly efficient and selective in the oxidation of aniline to azoxybenzene under mild conditions. When mixed with 28% AlNbO4 the alumina-based catalyst achieved high conversion and selectivity and very similar to the pure Nb2O5.
KeywordsHeterogeneous catalysis Aniline oxidation Azoxybenzene Simple high-energy milling Niobium
This study was financed in pt arby the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001, FAPERGS PqG 2017 (2551-0001157-0), FINEP/CT-PETRO (2653/09–01.11.0091.00) and FAPEMIG (CEX-APQ-00369-14), the Brazilian National Council for Scientific and Technological Development (CNPq). The author gratefully acknowledges the Brazilian Company of Metallurgy and Mining (CBMM) and Center for Characterization and Development of Protocols for Nanotechnology (CCDPN-SisNano/UNESP).
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.
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