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X-Ray-amorphous zeolites have been prepared ZSM-5 ZEOLITES have been used to prepare some unique which exhibit i.r. and catalytic properties typical for catalysts for a variety of processes.lY2 It has been shown ZSM-5 materials and therefore must contain ZSM-5 that these zeolites may be modified in various ways to crystals of less than 8 nm size in an amorphous matrix. monitor reaction selectivity.2 One way of doing so depends on the variation of the crystal size.3

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