Estudo cinético da degradação térmica e catalítica de petróleo pesado usando Al-MCM-41
The mesoporous nanostructured materials have been studied for application in the oil industry, in particular Al-MCM-41, due to the surface area around 800 to 1.000 m2 g-1 and, pore diameters ranging from 2 to 10 nm, suitable for catalysis to large molecules such as heavy oil. The MCM-41 has been syn...
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| Formato: | doctoralThesis |
| Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/17781 |
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| Resumo: | The mesoporous nanostructured materials have been studied for application in
the oil industry, in particular Al-MCM-41, due to the surface area around 800 to 1.000
m2 g-1 and, pore diameters ranging from 2 to 10 nm, suitable for catalysis to large
molecules such as heavy oil. The MCM-41 has been synthesized by hydrothermal
method, on which aluminum was added, in the ratio Si/Al equal to 50, to increase the
generation of active acid sites in the nanotubes. The catalyst was characterized by X-ray
diffraction (XRD), surface area by the BET method and, the average pore volume BJH
method using the N2 adsorption, absorption spectroscopy in the infrared Fourier
Transform (FT-IR) and determination of surface acidity with application of a probe
molecule - n-butylamine. The catalyst showed well-defined structural properties and
consistent with the literature. The overall objective was to test the Al-MCM-41 as
catalyst and thermogravimetric perform tests, using two samples of heavy oil with API º
equal to 14.0 and 18.5. Assays were performed using a temperature range of 30-900 ° C
and heating ratios (β) ranging from 5, 10 and 20 °C min-1.The aim was to verify the
thermogravimetric profiles of these oils when subjected to the action of the catalyst Al-
MCM-41. Therefore, the percentage ranged catalyst applied 1, 3, 5, 10 and 20 wt%, and
from the TG data were applied two different kinetic models: Ozawa-Flynn-Wall (OFW)
and Kissinger-Akahrira-Sunose (KAS).The apparent activation energies found for both
models had similar values and were lower for the second event of mass loss known as
cracking zone, indicating a more effective performance of Al-MCM-41 in that area.
Furthermore, there was a more pronounced reduction in the value of activation energy
for between 10 and 20% by weight of the oil-catalyst mixture. It was concluded that the
Al-MCM-41 catalyst has applicability in heavy oils to reduce the apparent activation
energy of a catalyst-oil system, and the best result with 20% by weight of Al-MCM-41 |
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