MEDEIROS, C. D.; http://lattes.cnpq.br/1551298985015836; MEDEIROS, Cláudia Dourado.
Résumé:
The mesoporous molecular sieves have a hexagonal arrangement of
mesopores with pore diameters ranging from 2 to 10 nm, which implies in a high
surface area. The addition of a metal into these structures has the function of
generating acidity in the material making it more reactive, increasing the possibility of
using it as a catalyst into the oil industry. Nowadays, one of the problems found by
researches to obtain these type of molecular sieves is the long time of structure
formation taken by these materials. In this study, the mesoporous molecular sieves
MCM - 41 and Al -MCM -41 were synthesized using two traditional microwave, with
the primary goal of reducing the time of synthesis of the material hydrothermal
processes. The molecular sieve MCM -41 was synthesized using the traditional
hydrothermal process 100 °C for 48 hours , as well as hydrothermal process using
microwave by three methods , adopting different times and temperatures . Based on
the results obtained with the synthesis of molecular sieve MCM -41 by hydrothermal
microwave method, the same methods were applied to the molecular sieve Al -MCM
-41 under the same conditions of time and temperature. Through the DRX patterns
was observed that the hexagonal structure was formed. It was found that the best
time of synthesis of Al- MCM-41 was given 60 minutes at 130 oC. From these data,
new syntheses were carried out by reducing the time gradually. The results of DRX,
MEV and FTIR show that the mesoporous molecular sieves were formed, it is
possible to identify their structure and morphology. The best results for the synthesis
of mesoporous molecular sieves MCM - 41 and Al -MCM -41, were at times 60 and
40 minutes and temperatures of 130 °C, respectively.
