Porous solids pillared based on magadiite

• Grant number: 13/25928-6
• Support type: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): March 01, 2014
• Effective date (End): June 30, 2014
• Field of knowledge: Physical Sciences and Mathematics - Chemistry
• Principal Investigator: Heloise de Oliveira Pastore
• Grantee: Antonia Daniele Souza Bruno Costa
• Home Institution: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The preparation of mesoporous materials from layered substances has attracted attention because of their possible use as catalysts, molecular sieves among other uses. Furthermore, the intercalation of compounds between the layers and the formation of pillars into the interlayer region result in a composite with more controlled porous characteristics, besides the larger surface area. In this project, certain procedures will be investigated: i) insertion of cetyltrimethylammonium cations (CTA+) into the magadiite interlayer space and pillarization using TEOS, which results in a Pillared Interlayered Clays - (PILC) compound; ii) pillarization with TEOS and simultaneous functionalization of pillars with aminoproyltrithoxysilane (ATPS) groups, which results in a hybrid compound (HYB). After the sample preparation, PILC and HYB will be analyzed by many techniques, such as X-ray diffraction in varied temperatures, Fourier transformed infrared spectroscopy, thermogravimetric analysis, nuclear magnetic resonance, and nitrogen adsorption at cryogenic temperatures. The project intends to demonstrate that both PILC and HYB materials contain pillars chemically linked to lamellas. In other words, there is an intention to prove that the composites are not a mixture of amorphous and crystalline phases, but that there is a bond between the crystalline layer and the amorphous pillar (funcionalized by aminopropyl groups in HYB). The differences in porosity fo the samples obtained by these two syntheses will also be studied.