Hollow zeolite architectures on different length scales have been obtained upon controlled desilication of Al-zoned ZSM-5 zeolites in alkaline medium. The hollow ZSM-5 crystals possess a functional Al-rich exterior and a tunable internal porosity and accessibility.
![Creation of hollow zeolite architectures by controlled desilication of Al-Zoned ZSM-5 crystals](https://www.iciq.org/wp-content/uploads/2014/03/Creation-of-hollow-zeolite_eng_noticies_articles_2005_18.gif)