[M]-RUB-18: a precursor of micro e mesoporous solids and nanolayers

• Grant number: 12/09001-7
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: August 01, 2012
• End date: September 30, 2016
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Heloise de Oliveira Pastore
• Grantee: Francisca Solânea de Oliveira Ramos
• Host Institution: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The layered silicate Na-RUB-18 presents crystal structure in two dimensions (2 D) and crystals with plate-like morphology. Each lamella consists in cages linked through five-membered rings of silicon tetrahedra and its inner surfaces are covered by silanol groups (Si-OH) and silanolate species (SiO-), which generate negative charges. These charges are balanced by Na+ cations octahedrally coordinated by water molecules in the interlayer space. The silanol groups of the surface are responsible for the chemical reactivity of the Na-RUB-18 and this material have high ion exchange capacity and selectivity because it ions Na+ can be exchanged by organic/inorganic ions. Thus their surface and interlayer space can be modified. However, the Na-RUB-18 has weak acidity and low external surface area (8 m2.g-1), which limits its application in heterogeneous catalysis. This PhD Project aims at isomorphously substituting framework silicon by Al, Fe, B, V and Ti into Na-RUB-18 structure, and at preparing pillared and/or exfoliated Na-[M]-RUB-18 which are applied into the model reaction of converting xylose to furfural. Additionally, zeolite [M]-RUB-24 (RWR) will be prepared through topotatic reaction by condensation of Si-OH neighboring groups. The materials obtained will be characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Solid-State Nuclear Magnetic Resonance (NMR), Thermogravimetric Analysis (TGA), Chemisorption Studies, Inductive Coupled Plasma Optical Emission Spectroscopy (ICP-OES and N2 adsorption.

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)

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, SEP 21 2017. (14/06942-0, 12/09001-7)

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, 2017. (14/06942-0, 12/09001-7, 13/25706-3)

Academic Publications

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

RAMOS, Francisca Solânea de Oliveira. [M]-RUB-18: a precursor of micro and mesoporous solids and nanolayers. 2016. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Instituto de Química Campinas, SP.