ZSM-5, its preparation and use in ethylbenzene dealkylation

摘要

A new configuration of ZSM-5 is provided whereby the crystals have a higher average silica to alumina ratio at the edges of each crystallite than in the center as determined from a narrow slit line scan profile obtained from SEM/EDX or TEM/EDX elemental analysis. Such ZSM-5 crystals are obtained by a preparation process using L-tartaric acid. The new configuration ZSM-5 provides significantly reduced xylene losses in ethylbenzene dealkylation, especially when combined with silica as binder, and one or more hydrogenation metals selected from platinum, tin, lead, silver, copper, and nickel.

主权项

1. An ethylbenzene dealkylation process, which process comprises: contacting, in the presence of hydrogen, a feedstock which comprises ethylbenzene with a catalyst composition, comprising ZSM-5 crystals, comprising a ZSM-5 crystallite having an average SAR at the edge of the crystallite and an average SAR at the centre of the crystallite, as determined via SEM/EDX or TEM/EDX elemental analysis, wherein the average SAR at the edge of the crystallite is higher than the average SAR at the centre of the crystallite.