Effect of Matrix on the Metal Poisoning of REY Catalysts

The effect of matrix on the resistance of vanadium and nickel poisoning of the REY zeolite has been investigated by X-ray diffraction, nitrogen adsorption, and n-hexane cracking reaction. Alumina (A1₂O₃), magnesia-alumina (MgO-Al₂03), alumina-aluminum phosphate (AAP), and magnesia-alumina-aluminum phosphate (MgAAP) were used as matrices of REY. The presence of matrix can increase the resistance of REY to steam deactivation. AAP has a better hydrothermal stability than the other matrics. MgOAl₂O₃ matrix demonstrates the highest ability to capture vanadium due to the basicity of magnesia. There is an interaction between vanadium and nickel. This interaction inhibits the destruction of REY structure caused by vanadium. AAP has a strong interaction with nickel. The stronger the nickel-matrix interaction, the less poison effect of nickel. In addition, the strong interaction leads to the decrease in nickel’s ability to retard the destruction of REY structure by vanadium.