• A novel dual-template method produces hierarchical ZSM-5 with tunable mesoporosity and high crystallinity.
• The hierarchical zeolite exhibits a 25% increase in propylene selectivity and a 3-fold longer catalyst lifetime in MTP reaction.
• Reduced diffusion limitations and optimized acid site accessibility are key to the enhanced catalytic performance.
• The synthesis approach is scalable and cost-effective, offering potential for industrial application.