Abstract
Zeolite ZSM-57 can be synthesized from sodium-containing alumosilicate gels using hexaethyl-C5-diquat as organic template and silica sol as silica source. ZSM-57 can be readily distinguished from the structurally closely related zeolites with the FER framework topology by its X-ray powder pattern and mid-infrared spectrum. From thermogravimetric analysis of as-synthesized ZSM-57 it follows that applying an air calcination at 550°C for several hours is sufficient to remove the organic template from the pores of the zeolite. The results of two selected test reactions for probing the effective pore width of zeolites, viz. ethylbenzene disproportionation and n-decane isomerization suggest that the pore width is larger for ZSM-57 as compared to ZSM-35 (ferrierite) and ZSM-5. This is in agreement with their crystallographic structures and offers new opportunities in shape selective catalysis and molecular sieve separation.
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