Feasible and clean solid-phase synthesis of LiNbO3 by microwave- induced combustion and its application as catalyst for low- temperature aniline oxidation.
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2018
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Abstract
In this work, a feasible, fast, clean and efficient
microwave-induced combustion method for direct synthesis of
LiNbO3 in solid phase was developed. X-ray powder diffraction
studies showed that quasi-pure Li−Nb−O phases, such as
LiNbO3 and Li3NbO4, or mixtures of LiNbO3, Li3
NbO4 and
LiNb3O8, could be successfully synthesized. The resulting
powders were efficiently applied as catalysts under ambient
conditions in the oxidation process of aniline using hydrogen
peroxide as oxidant. The proposed method was performed in a
commercial system using high-pressure quartz vessels, which
allowed safe control of the reactions−that usually occurs in less
than 1 min. The results showed that the reaction conditions as
well as the structural and morphological characteristics of the
catalyst influenced the aniline oxidation process. Therefore, the present method for the preparation of LiNbO3 described herein,
displayed many advantages when compared to conventional combustion methods, such as the physical characteristics of the
obtained compound. Moreover, this new approach is considerably faster, safer and cleaner than other traditional procedures
described in literature for LiNbO3 synthesis. This new microwave-induced combustion method is less time-consuming, saves
energy, as well as affording the stoichiometric formation of inorganic particles.
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Keywords
Microwave-induced combustion, Niobium compound synthesis, Aniline oxidation, Low-temperature reactions
Citation
CARRENO, N. L. V. et al. Feasible and clean solid-phase synthesis of LiNbO3 by microwave- induced combustion and its application as catalyst for low- temperature aniline oxidation. ACS Sustainable Chemistry & Engineering, v. 6, p. 1680-1691, 2018. Disponível em: <https://pubs.acs.org/doi/abs/10.1021/acssuschemeng.7b02921?af=R>. Acesso em: 05 abr. 2018.