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Pore size of ZSM-5 zeolite can be engineered by two different methods: (a) the desilication-stabilization (DS) method allows the enlargement of the size of the ZSM-5 zeolite micropores from the average value of 0.53nm to that of 0.59nm. (b) The desilication-reinsertion-stabilization (DRS) method results in the narrowing of the size of the zeolite micropores down to 0.46nm. The DRS method has recently...