Alquilação de tolueno com propeno, através de complexo ferro (II) ᵦ- diimina homogêneo e heterogeneizado em MCM-41, Al-MCM-41 e SBA-15
This work describes the synthesis and aplication of homogeneous and heterogenized iron catalysts in the alkylation reaction of toluene with propene, empolying experimental design. The homogenous complex was obtained trough the synthesis of the organic ligand folowed by the complexation of the iro...
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| 格式: | Dissertação |
| 语言: | por |
| 出版: |
Universidade Federal do Rio Grande do Norte
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| 在线阅读: | https://repositorio.ufrn.br/jspui/handle/123456789/19826 |
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| 总结: | This work describes the synthesis and aplication of homogeneous and heterogenized iron
catalysts in the alkylation reaction of toluene with propene, empolying experimental design.
The homogenous complex was obtained trough the synthesis of the organic ligand folowed
by the complexation of the iron(II) chloride. As to the heterogenized complexes, first were
synthetized the inorganic supports (SBA-15, MCM-41 and Al-MCM-41). Then, it was
synthetized the ligand again, that through funcionalization with chloropropyltrimethoxysilane
(CPTMS), was anchored on the support previously calcinated. To these anchored
ligands, was complexed the iron(II) chloride, previously solubilizated in tetrahydrofuran
(THF). The organic ligand characterization was accomplished trough nuclear magnetic
resonance (NMR) and Infrared spectroscopy (IV). The supports were characterized with
x-ray diffraction (DRX), texture analysis with nitrogen adsorption/desorption (before
and after the anchoring), termogravimetric analysis (TG) and infrared (IV). The metalic
content was quantified trough the atomic absorption spectrophotometry (AAS). The complexes
were tested in catalytic reactions emolying ethylaluminium sesquichloride (EASC)
as co-catalyst in steel reactor, under mecanic stirring. The reaction conditions ranged from
4 to 36 ◦C, with many aluminum/iron ratios. The catalysts were actives in homogeneous
and heterogenized ways. The homogenous catalytic complex showed a maximum turnover
frequency (TOF) of 8.63 ×103
· h
−1
, while, in some conditions, the anchored complexes
showed better results, with TOF of until 8.08 ×103
· h
−1
. Aditionally, it was possible to
determine an equation, to the homogenous catalyst, that describes the product quantity
in function of reacional temperature and aluminum/iron ratio. |
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