Preparation of maghemite-mesoporous silica: core-shell influence in catalytic performance

• Grant number: 11/11127-6
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): September 01, 2011
• Effective date (End): August 31, 2012
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal researcher: Lucas Alonso Rocha
• Grantee: Jediel Oliveira Damas
• Home Institution: Pró-Reitoria Adjunta de Pesquisa e Pós-Graduação. Universidade de Franca (UNIFRAN). Franca , SP, Brazil

Abstract

About a quarter of world production of monomers and chemical intermediates are produced by selective oxidation over solid catalysts and therefore, there is a great interest in basic and applied research in this area. Although the majority of catalysts used in industrial processes are well established, there is still possibilities for improvement both in engineering and in relation to the activity and properties of the catalyst. Thus, the search for more efficient catalytic processes, as well as the reagents which are less polluting and low-cost, heterogeneous catalysis makes one of the most advantageous due to high activity, selectivity, and the easy recovery of catalysts and reusability in a large number of cycles catalytic. In this context, magnetic materials (Fe2O3) have been widely studied due to its wide application as ferrofluids, pigments, data storage, biosensors, catalysts and others. On the other hand, the obtaining mesoporous matrix based on the presence of supramolecular assemblies of surfactants to direct the structures of inorganic mesostructure from solubilized inorganic precursors, and the macroscopic morphology and orientation of the pores can be controlled in most cases. These properties, combined with high hydrothermal stability, makes these materials excellent supports for catalysts with several potential applicatons. The main objective of this project is to study the influence of core-shell in performance catalytic in oxidation reactions. For this purpose, mesoporous silica containing maghemite nanoparticles into the pores will be prepared aiming at applications in the manufacturing of new catalysts. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DAMAS, JEDIEL O.; MOSCARDINI, SUSANE B.; OLIVEIRA, LIDIA R.; DA SILVA, ROBSON R.; NASSAR, EDUARDO J.; DE FARIA, EMERSON H.; CIUFFI, KATIA J.; RIBEIRO, SIDNEY J. L.; ROCHA, LUCAS A. Effect of silica coating on the catalytic activity of maghemite nanoparticles impregnated into mesoporous silica matrix. Materials Chemistry and Physics, v. 225, p. 145-152, MAR 1 2019. Web of Science Citations: 0.