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Nanostructured layered solids as acid, basic and redox catalysts


This project involves the synthesis and characterization of three layered materials: magadiite and octosilicate (also known as RUB-18) from the family of the hydrated layered silicates and talc, a 2:1 phyllosilicate clay, and their use in the catalytic reactions of ethanol to ethylene, ethylether and acetaldehyde. Al, V, Ti, Fe and B will be introduced into the structure of RUB-18, while Al and V, isolated or together, will be introduced in magadiite. Aluminum and boron, in the 3+ formal oxidation state, will be examined as the sources of acid sites; the other metallic ions, V+4/+5, Ti+4 and Fe+3 may provide redox catalytic sites. The two metals with which we have larger experience, V+4/+5 e Al+3, will be introduced in magadiite, with the objective to generate acidity and redox capability simultaneously, in order to produce a bifunctional catalyst. Talc will be organomodified from the synthesis, with organic groups covalently bound to the lamella. The target pending groups contain amine functionalities that will work as basic catalytic sites and for the growth of dendrons that will provide the material with a larger number of active sites. Solids will be characterized in relation to their structure, thermal and hydrothermal stability and the features of the active sites: adsorption of molecular probes for acid sites (NH3 e CO), basic (CO2) and redox (O2/H2) and examined by thermoprogrammed desorption and Fourier transformed infrared spectroscopy. After confirmation of the identity of the solids and some of their reactivities, and before a deeper characterization, the lamellar materials will be tested in the transformation of ethanol as catalytic model reaction for each determined function. (AU)

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Scientific publications (12)
(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)
RAMOS, FRANCISCA S. O.; PASTORE, HELOISE O.. 2D-to-disguised 3D materials with built-in acid sites: H+-[Al]-RUB-18. DALTON TRANSACTIONS, v. 46, n. 35, p. 11728-11737, . (14/06942-0, 12/09001-7)
PAZ, GIZEUDA L.; MUNSIGNATTI, ERICA C. O.; PASTORE, HELOISE O.. Novel catalyst with layered structure: Metal substituted magadiite. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, v. 422, n. SI, p. 43-50, . (14/06942-0)
ANDRADE, JR., MARCOS A. S.; NOGUEIRA, ANA F.; MIETTUNEN, KATI; TIIHONEN, ARMI; LUND, PETER D.; PASTORE, HELOISE O.. Quasi-solid electrolyte with polyamidoamine dendron modified-talc applied to dye-sensitized solar cells. Journal of Power Sources, v. 325, p. 161-170, . (14/06942-0, 13/05911-1)
SANTANA ANDRADE, JR., MARCOS A.; TIIHONEN, ARMI; MIETTUNEN, KATI; LUND, PETER; NOGUEIRA, ANA F.; PASTORE, HELOISE O.. Gel Electrolytes with Polyamidopyridine Dendron Modified Talc for Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES, v. 9, n. 24, p. 20454-20466, . (14/06942-0, 13/05911-1)
RAMOS, FRANCISCA S. O.; ALMEIDA, RAMON K. S.; LOPES JUNIOR, CICERO A.; ARRUDA, MARCO AURELIO Z.; PASTORE, HELOISE O.. A Straightforward Method for Determination of Al and Na in Aluminosilicates Using ICP OES. Journal of the Brazilian Chemical Society, v. 28, n. 8, p. 1557-1563, . (14/06942-0, 12/09001-7, 13/25706-3)
CAMPOS, GUILHERME P.; ALBUQUERQUE, ELISE M.; FRAGA, MARCO A.; PASTORE, HELOISE O.. Continuous Cellobiose Hydrolysis over Lamellar Aluminosilicates-Unveiling [Al]-magadiite Water-Tolerant Acid Sites. Industrial & Engineering Chemistry Research, v. 60, n. 13, p. 4794-4805, . (14/06942-0)
BAFERO, GABRIEL B.; MUNSIGNATTI, ERICA C. O.; PASTORE, HELOISE O.. Lamellar-zeolitic transformations mediated by diffusionless and recrystallization mechanisms. Microporous and Mesoporous Materials, v. 323, . (14/06942-0)
KRYSIAK, YASAR; MASLYK, MARCEL; SILVA, BRUNA NADIA; PLANA-RUIZ, SERGI; MOURA, HIPASSIA M.; MUNSIGNATTI, ERICA O.; VAISS, VIVIANE S.; KOLB, UTE; TREMEL, WOLFGANG; PALATINUS, LUKAS; et al. The Elusive Structure of Magadiite, Solved by 3D Electron Diffraction and Model Building. CHEMISTRY OF MATERIALS, v. 33, n. 9, p. 3207-3219, . (14/06942-0)
ANDRADE, JR., MARCOS A. S.; MIETTUNEN, KATI; TIIHONEN, ARMI; LUND, PETER D.; NOGUEIRA, ANA E.; PASTORE, HELOISE O.. Stabilizing Dendron-Modified Talc-Based Electrolyte for Quasi-Solid Dye-Sensitized Solar Cell. Electrochimica Acta, v. 228, p. 413-421, . (14/06942-0, 13/05911-1)
ANDRADE, JR., MARCOS A. S.; PASTORE, HELOISE O.. Toward a Delaminated Organotalc: The Use of Polyamidoamine Dendrons. ACS APPLIED MATERIALS & INTERFACES, v. 8, n. 3, p. 1884-1892, . (14/06942-0, 13/05911-1)
ALMEIDA, RAMON K. S.; PAZ, GIZEUDA L.; BAFERO, GABRIEL B.; PASTORE, HELOISE O.. Properties of layered [Al]- and [V,Al]-magadiite catalysts as revealed by ethanol dehydration. Microporous and Mesoporous Materials, v. 284, p. 1-9, . (14/06942-0, 13/25706-3)
BAFERO, GABRIEL B.; ARAUJO, VICTOR A.; ALMEIDA, RAMON K. S.; PASTORE, HELOISE O.. Catalytic performance of ferrierite and omega zeolites obtained through 2D-3D-3D transformation from Na-RUB-18 layered silicate. Microporous and Mesoporous Materials, v. 302, . (13/25706-3, 14/06942-0)

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