The nucleation of a ZSM-5 zeolite in the presence of silylated polyethylenimine polymers affords composite crystals that contain phase-segregated polymer. Calcination of the crystals results in zeolites with uniform intracrystal mesopores smaller than 10 nm, which are ideally suited for size-selective catalytic conversions of large molecules.
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Wang et al. (2006) studied this question.
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