ABSTRACT
M2-Forming uniquely produces aromatic concentrates. Compared with other zeolites, the HZSM-5 catalyst is unique in its ability to catalyze the aromatization reaction with sustained activity over a period of several days. Kitagawa et al. reported a yield of 71% aromatics from propane through the addition of gallium to the ZSM-5 catalyst. The Mobile Toluene Disproportionation Process is designed to convert toluene to a mixture of xylene isomers and benzene. The Mobil/Badger Ethylbenzene process produces ethylbenzene, the feedstock for styrene, by alkylating benzene with ethene over a ZSM-5 catalyst. The selectivity and stability advantages of zeolite catalysts may also be realized in the production of heterocompounds such as alcohols, ethers, and glycols. Aromatic alkylation reactions which led to a number of para selective products have been duplicated on phenols and thiophenes, as have halogenation and nitration reactions.
