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← ScienceWhich mechanism causes increased catalytic activity in zeolites?
A)Framework aluminum substitution increasing acidity✓
B)Increased silanol defects impairing activity
C)Decreased micropore size reducing interaction
D)Cation exchange blocking active sites
💡 Explanation
Framework Aluminium substitution increases Bronsted acidity via inductive effects drawing electron density from oxygen atoms to the aluminium, increasing polarization because this polarization enhances interactions with reactants with orbitals therefore catalysis is promoted rather than slowed by blocked pores.
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