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.

Zeolite HZSM-5 HY para-lortho-selectivity 2.9 1.0 Isomerization/disproportionation 33 1.5 in

Figure 14.7

h CH,OH va[0 00 (a) reactant selectivity (b) product selectivity vo (c) transition-state selectivity < -40

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Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt

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