Synergetic effects of hierarchical porosity, chemical, acidic, and hydrothermal modification of the NaY zeolite and their simultaneous use in the technology of the Fluid Catalytic Cracking (FCC)

Nowadays cracking activity and selectivity are influenced by some factors like acid activation, surface area, and pore structure of ultra-stable Y zeolites (USY) in Fluid Catalytic Cracking (FCC). This work was focused on the properties of two types of modified Y zeolite both of which are based on NaY zeolite. To improve the stability of zeolites, they were treated with different techniques such as chemical, acidic, and hydrothermal techniques. Finally, they were used simultaneously in the formulation of the FCC to improve its performance and selectivity. The characterization of the modified zeolites and the FCC final product was performed by N۲-porosimetry, X-ray diffraction spectrometry (XRD), X-ray fluorescence spectrometry (XRF), scanning electron microscopy (SEM), Temperature programmed desorption (TPD), and inductively coupled plasma-optical emission spectrometry (ICP-OES). Accordingly, XRF showed a high silicate content level in synthesized zeolites, XRD indicates the appropriate Si/Al ratio in FCC, N۲-porosimetry revealed the creation of porous zeolite crystal of their sodalite cage and presence of micro-meso structure of USY samples with higher microporosity. The obtained Final product catalyst was evaluated in a micro-activity testing (MAT) unit. And Thermo gravimetric analysis (TGA) was done to measure the coke content of spent FCC to prove its better performance.

کلیدواژه ها:

Ultra-stable Y Zeolite ، Fluid catalytic cracking ، Hierarchical porosity ، Micro-meso structure ، Hydrothermal treatment ، Acid treatment