Catalytic performance as a function of nanostructuring of new oxides catalysts from the spray pyrolysis method

• Grant number: 14/11189-0
• Support type: Regular Research Grants
• Duration: November 01, 2014 - October 31, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal researcher: Silvania Lanfredi
• Grantee: Silvania Lanfredi
• Home Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
• Assoc. researchers: Elisabeth Djurado ; Marcos Augusto de Lima Nobre

Abstract

The main objective of this project deals, in this first step, with the synthesis by spray pyrolysis of nanopowders based on titantes of double perovskite structure with stoichiometry Ca1-xKxTiCux/2O3, where x = 0.10 to 0.50, and of KSr2Nb5O15 and NaSr2Nb5O15 niobates of tetragonal tungsten bronze structure and their solid solutions containing nickel atoms: KSr2(NixNb5-x)O15-delta, NaSr2(NixNb5-x)O15-delta where x = 0.25 to 0.75. This technique is based on pyrolysis of an aerosol produced by ultrasonic atomizer. The mounting of the system for the synthesis via spray pyrolysis will have the collaboration of the Profa. Elisabeth Djurado du Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces de Grenoble - França. Profa. E. Djurado has large experience in this method of synthesis, whose variables were studied and optimized allowing to obtain nanostructured materials and with controlled morphology. The nanoparticles will be characterized by X-ray diffraction, with the refinement of structural parameters by Rietveld method, infrared spectroscopy (FTIR), thermal analysis (TGA and DSC) and scanning electron microscope (SEM). The second step is the analysis of the catalytic activity of the powders synthesized in the production of biodiesel from vegetable oils. For evaluation of the catalytic activity of powders will be carried out the textural characterization by the N2 adsorption using the BET. Among these catalysts, the Sr0.8K0.2TiCu0.1O3 compound has shown excellent catalytic activity for the production of biodiesel. The catalytic potential, to obtaining biodiesel, of Ca1-xKxTiCux/2O3 nanoparticles,where x = 0.10 to 0.50, KSr2Nb5O15, NaSr2Nb5O15 and their solid solutions containing nickel atoms will be investigated from vegetable oils. The catalytic activity will be evaluated as a function of time and temperature of the catalyst in the reaction mixture, molar ratio of oil / alcohol and amount of catalyst. Thus, technology transfer, under this project, and studies of materials synthesized by this technique are of great importance for the production of biodiesel in the country. (AU)

Scientific publications

(6)

(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)

PRAXEDES, FABIANO R.; NOBRE, MARCOS A. L.; POON, PO S.; MATOS, JUAN; LANFREDI, SILVANIA. Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water. APPLIED CATALYSIS B-ENVIRONMENTAL, v. 298, DEC 5 2021. Web of Science Citations: 0.

LANFREDI, S.; MATOS, J.; DA SILVA, S. R.; DJURADO, E.; SADOUKI, A. S.; CHOUAIH, A.; POON, P. S.; GONZALEZ, E. R. P.; NOBRE, M. A. L. K- and Cu-doped CaTiO3-based nanostructured hollow spheres as alternative catalysts to produce fatty acid ethyl esters as potential biodiesel. APPLIED CATALYSIS B-ENVIRONMENTAL, v. 272, SEP 5 2020. Web of Science Citations: 0.

LANFREDI, SILVANIA; NOBRE, MARCOS A. L.; POON, PO S.; MATOS, JUAN. Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41. Molecules, v. 25, n. 1 JAN 2020. Web of Science Citations: 0.

LANFREDI, S.; PRAXEDES, F. R.; IVASHITA, F. F.; PAESANO JR, A.; NOBRE, M. A. L. Suppression of ferroelectric phase-transition in niobates via solid solution formation. Materials Letters, v. 254, p. 85-88, NOV 1 2019. Web of Science Citations: 0.

MATOS, JUAN; LANFREDI, SILVANIA; MONTANA, RICMARY; NOBRE, MARCOS A. L.; FERNANDEZ, MARIA C.; ANIA, CONCHI O. Photochemical reactivity of apical oxygen in KSr2Nb5O15 materials for environmental remediation under UV irradiation. Journal of Colloid and Interface Science, v. 496, p. 211-221, JUN 15 2017. Web of Science Citations: 4.

LANFREDI, SILVANA; SILVEIRA, GISETE S.; POTENSA, BRUNO S.; NOBRE, MARCOS A. L. ZnO/Zn/Amorphous Carbon Matrix Nanostructured Composite Powder: a New Photocatalyst for Dye. MRS ADVANCES, v. 1, n. 19, p. 1327-1332, 2016. Web of Science Citations: 0.