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Title: Combining active phase and support optimization in MnO2-Au nanoflowers : enabling high activities towards green oxidations.
Authors: Silva, Anderson Gabriel Marques da
Rodrigues, Thenner Silva
Candido, Eduardo Guimarães
Freitas, Isabel Cristina de
Silva, Alisson Henrique Marques da
Fajardo, Humberto Vieira
Balzer, Rosana
Gomes, Janaina Fernandes
Assaf, Jose Mansur
Oliveira, Daniela Coelho de
Oger, Nicolas
Paul, Sebastien
Wojcieszak, Robert
Camargo, Pedro Henrique Cury
Keywords: Low-temperature
Issue Date: 2018
Citation: SILVA, A. G. M. da et al. Combining active phase and support optimization in MnO2-Au nanoflowers : enabling high activities towards green oxidations. Journal of Colloid and Interface Science, v. 530, p. 282-291, nov. 2018. Disponível em: <>. Acesso em: 7 mar. 2019.
Abstract: Among the several classes of chemical reactions, the green oxidation of organic compounds has emerged as an important topic in nanocatalysis. Nonetheless, examples of truly green oxidations remain scarce due to the low activity and selectivity of reported catalysts. In this paper, we present an approach based on the optimization of both the support material and the active phase to achieve superior catalytic performances towards green oxidations. Specifically, our catalysts consisted of ultrasmall Au NPs deposited onto MnO2 nanoflowers. They displayed hierarchical morphology, large specific surface areas, ultrasmall and uniform Au NPs sizes, no agglomeration, strong metal-support interactions, oxygen vacancies, and Auδ+ species at their surface. These features led to improved performances towards the green oxidations of CO, benzene, toluene, o-xylene, glucose, and fructose relative to the pristine MnO2 nanoflowers, commercial MnO2 decorated with Au NPs, and other reported catalysts. We believe that the catalytic activities, stabilities, and mild/green reaction conditions described herein for both gas and liquid phase oxidations due to the optimization of both the support and active phase may inspire the development of novel catalytic systems for a wealth of sustainable transformations.
ISSN: 0021-9797
Appears in Collections:DEQUI - Artigos publicados em periódicos

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