The large amount of rice produced in Brazil generates a large volume of co-products, such as, Rice Husk (RH) and Rice Husk Ash (RHA). These co-products have amounts of silicon (Si) present in their structure, which can be used to synthesize silica-based materials as zeolites and MCM-type structures. The synthesis of MCM-48 material was carried out at room temperature, using the ionic liquid [C16MI·Cl] as structure-directing agent, depositing the niobium in situ during the synthesis with different molar ratios of Si/Nb (5, 20, 50 and 80). The material obtained was subjected to characterization by X-Ray Diffraction (XRD), Nitrogen Adsorption/Desorption isotherms and Scanning Electron Microscopy (SEM). The results confirm the formation of Nb/MCM-48 materials, in which their properties are consistent with those described in the literature. The deposition of Nb on MCM-48 did not change its structural properties, such as specific surface area and pore distribution for Si/Nb higher than 5. The results obtained demonstrate the success in the synthesis of mesoporous materials Nb/MCM-48 using industrial residues of rice as an alternative source of silicon, and in situ deposition of the niobium metal on the structure.
A visibilidade de reaproveitamento de materiais, subprodutos e coprodutos vem ganhando cada vez mais espaço em pesquisas acadêmicas, utilização industrial e inovação, com isso, o propósito do presente estudo são as possibilidades de utilização da solução de silicato de sódio proveniente da cinza da casca de arroz (CCA). Além disso, adicionou-se Líquido Iônico (LI) e diferentes relações de silício e nióbio para buscar melhorias nas propriedades físico-químicas dos elastômeros. Por meio de Difração de Raios X (DRX) comprovou-se a obtenção do material mesoporoso do tipo MCM-48 pura e quando empregada variadas relações molares de Si/Nb, Nb-MCM-48. Ao aplicar em elastômeros, concluiu-se por meio de torque máximo e mínimo; tempo ótimo e scorch, que o acréscimo de LI e também da Nb-MCM causaram efeitos nos seus desempenhos, como aceleramento do tempo de scorch e melhorias nas propriedades mecânicas.
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