Estudo de réplicas de materiais mesoporosos obtidos a partir de hard template, usando como molde de estrutura CMK-3
Obtaining new materials with defined porosities and high specific areas gives rise to new possibilities both in science and in industry. Among the ways to obtain new materials with porosity are the Hard-template and Soft-template synthesis routes. In the Hard-template synthesis route, a template...
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Format: | doctoralThesis |
Sprache: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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Online Zugang: | https://repositorio.ufrn.br/handle/123456789/55334 |
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Zusammenfassung: | Obtaining new materials with defined porosities and high specific areas gives rise
to new possibilities both in science and in industry. Among the ways to obtain
new materials with porosity are the Hard-template and Soft-template synthesis
routes. In the Hard-template synthesis route, a template with a defined structure
is used to obtain the desired structure from it, among the materials used as the
mold of structures there is the SBA-15 that is formed based on silicon and the
CMK-3. This is a carbon-based material that has rods interconnected by micro
rods that generate a mesoporous structure. Therefore, the objective of this work
is to use CMK-3 as a template for structures to obtain new mesoporous materials,
which are organized in a hexagonal way. Initially, a study was carried out varying
the amount of silicon source to assess the optimal amount for obtaining mesopore
materials. Then, the same study was carried out, varying the amount of aluminum
in the insertion of the studied replicas. The materials were characterized by X-ray
diffraction (XRD), scanning electron microscopy (SEM), Fourier transform
infrared spectroscopy (FTIR), N2 adsorption and desorption at 77 K. Mesoporous
silicas of the SBA-15 type were successfully synthesized, having specific areas
greater than 600 m2/g and uniform pores. CMK-3 carbon replicas were also
synthesized using SBA-15 as a structural mold, and the materials obtained
showed excellent textural and structural properties. The replicas obtained
showed areas greater than 700 m2/g and a total pore volume of 1.02 cm3/g. From
the SEM images, it was possible to observe materials with characteristic
morphologies for materials of the SBA-15 type, which shows that the procedure
used in the synthesis was efficient to replicate structures using materials of the
CMK-3 type as a template. |
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