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Zeolites are microporous, aluminosilicate minerals used as ________ catalysts in petroleum refining.
- Homogeneous
- Heterogeneous
- Enzymatic
- Photocatalytic
Answer: Heterogeneous
Zeolites (e.g., ZSM-5) have shape-selective pores for catalytic cracking, isomerization. Solid acid catalysts easily separated from products. Critical for clean fuel production. [[NCERT Chemistry Class 12]]