ZSM-5 has a top silicon to aluminum ratio. Whenever an Al3+ cation replaces a Si4+ cation, an added absolute allegation is appropriate to accumulate the actual charge-neutral. With proton (H+) as the cation, the actual becomes actual acidic. Thus the acidity is proportional to the Al content. The actual approved 3-D anatomy and the acidity of ZSM-5 can be activated for acid-catalyzed reactions such as hydrocarbon isomerization and the alkylation of hydrocarbons. One such acknowledgment is the isomerization of meta-xylene to para-xylene. Aural the pores of the ZSM-5 zeolite, para-xylene has a abundant college circulation accessory than meta-xylene. When the isomerization acknowledgment is accustomed to action aural the pores of ZSM-5, para-xylene is able to bisect forth the pores of the zeolite, diffusing out of the agitator actual quickly. This size-selectivity allows the isomerization acknowledgment to action bound in top yield.
ZSM-5 has been acclimated as a abutment actual for catalysis. In one such example, chestnut is deposited on the zeolite and a beck of booze is anesthetized through at temperatures of 240 to 320 °C as a vapour stream, which causes the booze to burn to acetaldehyde; two hydrogens are absent by the booze as hydrogen gas. It appears that the specific pore admeasurement of ZSM-5 is of leaven to this process, which aswell functions for added alcohols and oxidations. The chestnut is occasionally accumulated with added metals, such as chromium, to accomplished tune the assortment and specificity of the products, as there is acceptable to be added than one. Acetic acerbic is an archetype of one accessible byproduct from hot chestnut oxidation.It is acclimated to catechumen alcohols anon into gasoline.