Hierarchical zeolites desilication

In addition, experiments of isobutane diffusion reveal that the effective diffusivity is three times higher over a carbon-templated hierarchical zeolite [143]. Similar conclusions were drawn by Groen et al. [144] with hierarchical zeolites synthesized using the desilication method, where a two-order-magnitude improvement was observed in the diffusion of neopentane inside desiUcated ZSM-5 because of the shorter diffusion path length and presence of an accessible network of mesopores. 

Aromatization and isomerization of 1-hexene Hierarchical zeolite prepared by desilication with 0.5 M NaOH Selectivity toward aromatics of 19.1% while the selectivity values obtained with the conventional ZSM-5 drop to 5.1% [178]... 

Groen, J. C., Peffer, L. A. A., Moulijn, J. A. and Perez-Ramirez, J. Mechanism of hierarchical porosity development in MFI zeolites by desilication the role of aluminium as a pore-directing agent, Chem. Eur. J., 2005, 11, 4983 1994. 

---