doctoralThesis
Zeólitas sintetizadas com estruturas hierárquicas aplicadas a pirólise de resíduos da indústria de petróleo
Fecha
2016-07-26Registro en:
LIMA, Regineide de Oliveira. Zeólitas sintetizadas com estruturas hierárquicas aplicadas a pirólise de resíduos da indústria de petróleo. 2016. 100f. Tese (Doutorado em Ciência e Engenharia de Petróleo) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2016.
Autor
Lima, Regineide de Oliveira
Resumen
The petroleum industry generates different residues and zeolites are of great
importance in the treatment and processing of residues of the petroleum refining and
petrochemical industry for having peculiar properties. In this context, this paper reports
the zeolites study ZSM-5 with hierarchically structures of pores, synthesized using as
silanizante agent phenylaminopropyl trimethoxysilane (PHAPTMS) at concentrations of
15mol%, 17mol% and 20mol%, aiming at implementing the best material in thermo
catalytic pyrolysis of the waste generated of the petroleum industry. The synthesis of
ZSM-5 were also conducted without organic template, assisted by the seed induction
method in the form of powder, subjected to 180 °C for 27 h, the crystallization interrupt
periods at 8, 12 and 16 h for addition of PHAPTMS. The materials were synthesized and
characterized by the methods of X-ray diffraction (XRD), infrared spectroscopy (FTIR),
thermal analysis (TG / DTG), surface acidity measured by n-butylamine desorption
thermogravimetric analysis (TG) and FTIR, scanning electron microscopy (SEM),
nitrogen adsorption. The kinetic study by thermogravimetry of pure RAT and HDPE
waste was performed with and without catalyst. Through model-free kinetic method using
the integral curves TG, were estimated activation energy, conversion rates and time
degradation of waste in function of temperature. It was noted that for the materials
synthesized with 15mol% of PHAPTMS in periods of 8, 12 and 16h showed higher
concentrations of the active sites, surface acidity, making promising in HDPE
degradation. The kinetic study of HDPE by Vyazovkin method showed a lower activation
energy for the HZ5 15mol% material in the 16 h period. Also a lowering of the activation
energy was revealed when used this material in the kinetic study for the RAT. In the
thermal pyrolysis and thermalcatalytic of waste carried out at temperatures of 500 °C,
475 °C, 450 °C. It was chosen for use in thermalcatalytic pyrolysis, the material (HZ5
15mol% 16h) due to better acidity and lower energy required for the degradation of
HDPE. In thermalcatalytic pyrolysis of HDPE selectivity afforded products with added
values, which can be used in the petrochemical industry. In thermalcatalytic pyrolysis
RAT This material potentiated C1-C4 hydrocarbon groups; C5-C12, C13-C19 regarding the
LPG, gasoline and diesel. Providing better loads in the process and reducing the waste
generated during petroleum refining.