Abstract
The catalytic properties of zeolite β in the isomerization of metaxylene, and the methylation and disproportionation of toluene have been measured and compared with those of other zeolites like ZSM-5, -23, -48, and -50. While zeolite β does not exhibit product shape selectivity among the xylene isomers, it suppresses the formation of the bulky 1.3.5 isomer among trimethylbenzenes leading to high concentrations of the 1.2.4 isomer with the minimum cross section. The disproportionation-to-isomerization ratio in the reactions of metaxylene over these zeolites follows the order β ZSM-50 ZSM-5 ZSM-48 ZSM-23 ZSM-22. A comparison of β with ZSM-5 in the xylene isomerization process using industrial feedstock reveals similar trends. The observed shape-selective properties of β in these reactions of aromatic hydrocarbons are explained in terms of its 12-membered three-dimensional pore structure.
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