Q.Write the use of ZSM-5.

ZSM-5 is a zeolite catalyst; its chief use is converting alcohols into gasoline (petrol) and, in general, acting as a shape-selective catalyst in the petrochemical industry.

What it is: ZSM-5 (Zeolite Socony Mobil-5) is a synthetic zeolite - a porous crystalline aluminosilicate containing silicon (a p-block group-14 element) and aluminium in a three-dimensional framework with well-defined pores and channels.

Its use: Because its pores are of molecular dimensions, ZSM-5 acts as a shape-selective catalyst - only molecules of the right size and shape can enter the pores and react. Its most important application is:

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ZSM-5 is a zeolite catalyst that converts alcohols into gasoline (petrol) by dehydration.

Zeolites are microporous aluminosilicates in which some of the silicon atoms of the silicate framework are replaced by aluminium atoms, giving an Al-O-Si network with a cage-like structure. Because of their well-defined pore sizes they are widely used as shape-selective catalysts.

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