ZSM-22, with its distinctive one-dimensional channel system and ten-membered ring structure, finds significant application as an additive in Fluid Catalytic Cracking (FCC) processes. Here's how ZSM-22 stands out for FCC additive applications:

Structural Characteristics

• Unique Channel System: ZSM-22 possesses a unique one-dimensional channel system with a pore opening of approximately 0.45×0.55 nm, which is crucial for selective catalysis.
• Thermal Stability: It exhibits excellent thermal stability, allowing it to withstand the harsh conditions encountered in FCC units without significant degradation.

Catalytic Performance

• High Selectivity for Light Olefins: In the context of FCC, ZSM-22 enhances the production of light olefins such as propylene and butenes by promoting secondary reactions like cracking and isomerization of heavier hydrocarbons.
• Isomerization Activity: The catalyst demonstrates remarkable activity towards isomerization of long-chain alkanes and olefins, contributing to gasoline pool octane number improvement through the formation of highly branched iso-paraffins.

Application Benefits

• Increased Yield of Valuable Products: By incorporating ZSM-22 into FCC additives, refiners can achieve higher yields of gasoline, diesel, and light olefins while reducing the production of less desirable products like coke and heavy fuel oil.
• Flexibility in Operations: The use of ZSM-22 allows for operational flexibility, enabling refineries to adjust product slates based on market demand and economic considerations.

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