Catalysts synthesis with structured pores derivatives of hydrotalcite by combined use of sol-gel chemistry, surfactants and emulsion

• Grant number: 15/05321-5
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: June 01, 2015
• End date: February 28, 2019
• Field of knowledge: Engineering - Chemical Engineering - Chemical Technology
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Leandro Pierroni Martins
• Grantee: Davi Domingos Petrolini
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated scholarship(s): 16/12702-8 - Catalysts synthesis with structured pores derivatives of hydrotalcite by combined use of sol-gel chemistry, surfactans and emulsion, BE.EP.DR

Abstract

This proposal is a development and study of a new method that enables the synthesis of porous mixed oxides derived from hydrotalcite. Based on the structural properties and catalytic unique of hydrotalcites, this project proposes changes in the synthesis of these materials in order to further exploit its potential. The method is based on the combined use of supramolecular chemistry of surfactants and emulsions for producing hydrotalcites hierarchically structured pores with different scales. Interestingly in the development of porous catalysts is that the creation and design of pores not only interferes with the facilitated diffusion of reactants and products, but also raises some unique properties of the surface activity. The presence of amphipathic molecules and nonpolar molecules could alter the strength of the existing sites in the catalyst, resulting from the molds interactions with the surface of metal oxides. Thus, the efficiency of the material could be increased by modifying their structural and chemical property, or composition and organization of surface atoms in different microdomains. Interestingly, also in the porous engineered catalysts is expected to be obtained monolithic whole body, ie there would be no need for the sintering step and forming of the catalyst grains for use in continuous industrial reactors. Along with the porous properties, another important emerging factor has been studied and is the use of mixed oxides of aluminum and magnesium, aluminum and calcium, and aluminum and strontium, such as derivatives of hydrotalcite oxides which are widely used in catalysis. In this context, the objective of this project is the synthesis of catalysts and catalyst support derived from hydrotalcite with well defined properties. Each preparation step (precursors of the reaction mixture, emulsified colloidal system, sol-gel transition, aging and drying) has a number of factors that influence the final property of the solid, and whose control is necessary so that there is reproducibility in the preparations. The preparation will require very different skills, such as the phenomena governing the formation of gel, the colloid chemistry and drying operations, which will be accompanied by technical characterization of structure, texture and surface to establish the operating conditions of the synthesis and activity optimized catalytic. The catalytic activity of the mixed oxide is evaluated on the dehydration reaction of secondary alcohols such as 2-propanol. (AU)

Scientific publications

(4)

(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)

PETROLINI, DAVI D.; DA SILVA NETO, ALANO V.; URQUIETA-GONZALEZ, ERNESTO A.; PULCINELLI, SANDRA H.; SANTILLI, CELSO V.; MARTINS, LEANDRO. Catalytic performance of texturally improved Al-Mg mixed oxides derived from emulsion-synthesized hydrotalcites. RSC ADVANCES, v. 8, n. 11, p. 6039-6046, 2018. (13/01328-0, 15/05321-5)

PETROLINI, DAVI D.; URQUIETA-GONZALEZ, ERNESTO A.; PULCINELLI, SANDRA H.; SANTILLI, CELSO V.; MARTINS, LEANDRO. Emulsion-mediated synthesis of hierarchical mesoporousmacroporous Al-Mg hydrotalcites. Microporous and Mesoporous Materials, v. 240, p. 149-158, MAR 1 2017. (15/05321-5, 13/01328-0)

PETROLINI, DAVI D.; EAGAN, NATHANIEL; BALL, MADELYN R.; BURT, SAMUEL P.; HERMANS, IVE; HUBER, GEORGE W.; DUMESIC, JAMES A.; MARTINS, LEANDRO. Ethanol condensation at elevated pressure over copper on AlMgO and AlCaO porous mixed-oxide supports. CATALYSIS SCIENCE & TECHNOLOGY, v. 9, n. 8, p. 2032-2042, APR 21 2019. (16/12702-8, 15/05321-5)

PETROLINI, DAVI D.; CASSINELLI, WELLINGTON H.; PEREIRA, CRISTIANE A.; URQUIETA-GONZALEZ, ERNESTO A.; SANTILLI, CELSO V.; MARTINS, LEANDRO. Ethanol dehydrogenative reactions catalyzed by copper supported on porous Al-Mg mixed oxides. RSC ADVANCES, v. 9, n. 6, p. 3294-3302, JAN 24 2019. (15/05321-5, 13/01328-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

PETROLINI, Davi Domingos. Catalysts synthesis with structured pores derivatives of hydrotalcite by combined use of sol-gel chemistry, surfactants and emulsion. 2019. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Instituto de Química. Araraquara Araraquara.