Abstract
The effects of acidity and pore properties of rare earth modified USY on heavy oil conversion were investigated. USY with varied rare earth contents were prepared with impregnation method. FCC catalysts were also prepared with modified USY and tested by micro activity tests (MAT) and advanced catalytic evaluation (ACE). The results showed that USY3 had a good performance in cracking polycyclic hydrocarbons in heavy oil and diesel to aromatics and iso-olefins that exist in gasoline; the surface area and pore volume of USY3 increased by 54 m2/g and 0.032 ml/g, respectively, after porosity cleaning; the new optimized FCC catalysts improved the cracking of polycyclic aromatic hydrocarbons (PAHs) to form gasoline with high octane numbers. When tested on a pilot riser unit at 500 °C and 1.89 s with a catalyst-to-oil ratio of 5.6, the new catalyst Cat-3 had a 0.24 % higher propylene yield and a 1.52 % higher liquid yield compared with the reference catalyst Cat-1. However, it had a 7.89 % lower olefin content in FCC gasoline with the same octane numbers.
Highlights
Gasoline in refineries comes mainly from the units such as steaming of crude oil, catalytic cracking, catalytic reforming, hydrocracking and alkylation
The results showed that USY3 had a good performance in cracking polycyclic hydrocarbons in heavy oil and diesel to aromatics and iso-olefins that exist in gasoline; the surface area and pore volume of USY3 increased by 54 m2/g and 0.032 ml/g, respectively, after porosity cleaning; the new optimized fluid catalytic cracking (FCC) catalysts improved the cracking of polycyclic aromatic hydrocarbons (PAHs) to form gasoline with high octane numbers
It is wide acknowledged that the majority of active sites of FCC catalysts which are responsible for the cracking of heavy oil into light hydrocarbons exist on zeolite
Summary
Gasoline in refineries comes mainly from the units such as steaming of crude oil, catalytic cracking, catalytic reforming, hydrocracking and alkylation. Abstract The effects of acidity and pore properties of rare earth modified USY on heavy oil conversion were investigated. The results showed that USY3 had a good performance in cracking polycyclic hydrocarbons in heavy oil and diesel to aromatics and iso-olefins that exist in gasoline; the surface area and pore volume of USY3 increased by 54 m2/g and 0.032 ml/g, respectively, after porosity cleaning; the new optimized FCC catalysts improved the cracking of polycyclic aromatic hydrocarbons (PAHs) to form gasoline with high octane numbers.
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