Theoretical study of vanadium oxides interaction with Y-zeolite.

Area of Science:

• Catalysis science
• Materials science
• Chemical engineering

Background:

• Fluid catalytic cracking (FCC) catalysts suffer from metal contaminant deposition, particularly vanadium.
• Vanadium negatively impacts Y-zeolite structure stability during high-temperature regeneration.

Purpose of the Study:

• To elucidate the interaction mechanism between vanadium oxide molecules and Y-zeolite catalysts.
• To provide insights for improving FCC catalyst performance and longevity.

Main Methods:

• Quantum Molecular Dynamics (QMD) simulations were employed.
• Simulations introduced various vanadium oxide molecules (VO, V2O3, VO2, V2O5) into a Y-zeolite ring model.
• Regeneration conditions involving steam and oxygen were simulated.

Main Results:

• The primary reaction occurs between zeolite components and vanadium atoms.
• Vanadium interaction with the zeolite leads to hydrogen atom loss from active sites.
• This interaction significantly enhances oxygen reactivity.

Conclusions:

• Vanadium's detrimental effect on Y-zeolite stems from its interaction with zeolite active sites.
• Understanding this mechanism is crucial for developing strategies to mitigate vanadium poisoning in FCC catalysts.