Isomerization Zeolites for Hydrocarbon Upgrading

Isomerization with zeolite catalysts covers two distinct industrial applications: hydroisomerization of n-alkanes for dewaxing and cold-flow improvement, and aromatic isomerization (xylenes, ethylbenzene) for petrochemical intermediate production. Each application demands a different zeolite framework.

SAPO-11 is the reference catalyst for n-alkane hydroisomerization. Its AEL framework with elliptical 10-MR channels (~4.0 × 6.5 Å) provides mild acidity and constrained pore geometry that selectively isomerizes linear paraffins to branched isomers with minimal cracking. When formulated with a noble metal (typically Pt), Pt/SAPO-11 converts long-chain n-alkanes to mono- and di-branched iso-paraffins, improving pour point and cloud point while preserving liquid yield — the core of catalytic dewaxing for lubricant base oils and diesel.

Beta zeolite serves aromatic isomerization, particularly xylene isomerization to produce p-xylene and ethylbenzene conversion to benzene. Its 12-MR 3D pores provide access for substituted aromatics, and its strong acidity drives the isomerization reactions at commercial rates. SiO₂/Al₂O₃ ratios of 20-50 are typical.

Which Zeolite for Which Isomerization?

When requesting a sample, specify your feed type (n-paraffin range or aromatic stream), target isomerization route, and whether you need zeolite powder for catalyst formulation or a pre-formulated bifunctional catalyst.