Combining active phase and support optimization in MnO2-Au nanoflowers: Enabling high activities towards green oxidations

Autor(es):Mostrar menos -

da Silva, Anderson G. M. ^[1] ; Rodrigues, Thenner S. ^[1] ; Candido, Eduardo G. ^[1] ; de Freitas, Isabel C. ^[1] ; da Silva, Alisson H. M. ^[2] ; Fajardo, Humberto V. ^[3] ; Balzer, Rosana ^[4] ; Gomes, Janaina F. ^[2] ; Assaf, Jose M. ^[2] ; de Oliveira, Daniela C. ^[5] ; Oger, Nicolas ^[6] ; Paul, Sebastien ^[6] ; Wojcieszak, Robert ^[6] ; Camargo, Pedro H. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Engn Quim, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Fed Ouro Preto, Dept Quim, BR-35400000 Ouro Preto - Brazil

^[4] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC - Brazil

^[5] Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP - Brazil

^[6] Univ Lille, CNRS, Cent Lille, ENSCL, Univ Artois, UMR 8181, UCCS, F-59000 Lille - France

• Tipo de documento: Artigo Científico
• Fonte: Journal of Colloid and Interface Science; v. 530, p. 282-291, NOV 15 2018.
• Citações Web of Science: 3

Resumo

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, ultra small and uniform Au NPs sizes, no agglomeration, strong metal-support interactions, oxygen vacancies, and Au delta+ 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 phasewith 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. (C) 2018 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/21366-9 - Materiais híbridos contendo nanopartículas metálicas para aplicações catalíticas
• Beneficiário: Pedro Henrique Cury Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular