When dimethylbenzenes (xylenes) are passed over acidic zeolites (HZSM-5 that contains 10-rings and HY that contains larger
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When dimethylbenzenes (xylenes) are passed over acidic zeolites (HZSM-5 that contains 10-rings and HY that contains larger 12-rings), two processes can occur: isomerization to different mixtures of ortho, meta, and para isomers; or disproportionation to toluene (methylbenzene) and trimethylbenzenes, as shown in the table. State which of the shape-selective catalysis effects shown in Figure 14.7 is responsible for the enhanced para- to ortho-selectivity of HZSM-5 and for favoring the isomerization reaction over disproportionation in HZSM-5.
Figure 14.7
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HY is a largepore zeolite Similar amounts of isomeri...View the full answer
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Related Book For 
Solid State Materials Chemistry
ISBN: 9780521873253
1st Edition
Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt
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