Facile Synthesis of Nanosheet-Stacked Hierarchical ZSM-5 Zeolite for Efficient Catalytic Cracking of n-Octane to Produce Light Olefins

The development of an effective strategy for synthesizing two-dimensional MFI zeolites has attracted more and attention. Herein, nanosheet-stacked hierarchical ZSM-5 zeolite was obtained by a seed-assisted hydrothermal synthesis route using small amount [C18H37-N+(CH3)2-C6H12-N+(CH3)2-C6H12]Br2 (C18-6-6Br2) as structure-directing agent triethylamine (TEA) growth modifier. By varying the molar ratio C18-6-6Br2/TEA from 2.5/0 to 2.5/40, morphologies textural properties resultant HZ5-2.5/x catalysts were finely modulated. increasing x 5 40, morphology changed unilamellar assembly with narrow a–c plane intertwined nanosheets wide multilamellar house-of-cards morphology. thickness these almost 8–10 nm. In addition, selectivity light olefins reached 70.7% HZ5-2.5/10 catalyst, which 6.6% higher than that CZSM-5 (64.1%). Furthermore, exhibited better anticoking stability within 60 h reaction time compared conventional zeolite, could be attributed short diffusion path porosity. This work will provide valuable insights into rational design novel efficient cracking hydrocarbons.