masterThesis
Desativação e regeneração de catalisadores zeolíticos (HY E HZSM-5) utilizados em craqueamento catalítico fluidizado (FCC)
Fecha
2015-03-10Registro en:
LIMA, Andresa Jaciane Cabral de. Desativação e regeneração de catalisadores zeolíticos (HY E HZSM-5) utilizados em craqueamento catalítico fluidizado (FCC). 2015. 93f. Dissertação (Mestrado em Ciência e Engenharia de Petróleo) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2015.
Autor
Lima, Andresa Jaciane Cabral de
Resumen
The use of catalysts is of fundamental importance to the oil industry, given that
they reduce the time and energy required for a reaction to take place, improving
efficiency and product quality. In return they end up suffering deactivation, which can
be caused by several factors such as: poisoning of active sites for metals, sintering and
the formation of coke, which causes obstruction in the pores thus causing the loss of the
active phase of the material. After several cycles of use and regeneration, the catalysts
are arranged in nature thus becoming a serious environmental problem. Faced with this
problem the present study aimed to disable and regenerate acidic zeolites of HZSM-5
and HY types in order to compare the behavior of the same through the techniques: Xray
diffraction, adsorption of n-butyl amine Desorption, Analysis Thermogravimetric
(TG / DTG) and spectroscopy in the infrared Fourier transform. Disabling was held in
an adapted Micro activity reactor. After the reaction the deactivated catalysts were
obtained, and then performed regeneration in a muffle furnace. Through the
Thermogravimetric curves of n-butylamine desorption was observed a significant
increase in the density of acid sites of HZSM-5 average probably new adsorption sites
were generated during regeneration. It was also observed that the HZSM-5 zeolite
showed about 8% of coke, while HY showed 18% higher this percentage was due to the
fact that the zeolite faujasite (FAU) is more acidic, and thus promote further reaction, by
the greater coke formation. The coke formed in both zeolites have both aliphatic as
aromatic character.