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Title in Portuguese: Styrene oxidation to valuable compounds over nanosized FeCo-based catalysts: effect of the third metal addition
Author: Oliveira, Ana Paula Saraiva
Gomes, Igor Santos
Oliveira, Alcineia Conceição
Mendes Filho, Josué
Saraiva, Gilberto Dantas
Soares, João Maria
Sousa, Francisco Ferreira de
Campos, Adriana
Keywords: Estireno
Óxidos ternários
Issue Date: 2017
Publisher: Catalysts
Citation: OLIVEIRA, A. P. S.; GOMES, I. S.; OLIVEIRA, A. C.; MENDES FILHO, J.; SARAIVA, G. D.; SOARES, J. M.; SOUSA, F. F.; CAMPOS, A. Styrene oxidation to valuable compounds over nanosized FeCo-based catalysts: effect of the third metal addition. Catalysts, Basel, v. 7, n. 11, p. 1- 27, 2017.
Abstract: Nanosized FeCo-based solids were prepared via distinct preparation procedures. The catalytic performances of the solids for styrene oxidation in the presence of hydrogen peroxide were evaluated. The addition of promoters in FeCo such as Sn, Mo, or Cu was also investigated. The catalysts were characterized with XRD, Raman spectroscopy, TEM, chemical analyses, EPR and SEM-EDS. Of these solids obtained via four different methods, the catalyst prepared via the NC and CM procedures enabled a partial incorporation of the Sn into the FeCo matrix forming a very active phase, namely the Heusler alloy. This was ascribed to the high initial dispersion of Sn as a promoter into the FeCo matrix, which led to available FeCoSn (FCS) particles well dispersed and stable on the catalyst surface. In the case of incorporating Mo or Cu to the nanosized FeCo catalyst, a poor stability towards leaching was observed when operating under the same reaction conditions. Cu was much less active than both Sn and Mo, mainly leading to acetophenone, ethylbenzene, 2-phenyl ethanol, 2-phenyl acetic acid, and 2-phenyl acetaldehyde products. The best catalytic results under the optimized reaction conditions, especially at 50 C and styrene/H2O2 molar ratio of 1 were achieved with nanosized FCS. This solid had a conversion of ca. 70% and selectivity for aldehydes of ca. 27%, and the selectivity for the condensation products was 29%.
metadata.dc.type: Artigo de Periódico
ISSN: 2073-4344
Appears in Collections:DFI - Artigos publicados em revista científica

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