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Zeolites are alumino-silicatesthat are micro-porous in nature. Zeolites have a honeycomb-like structure,which makes them shape-selective catalysts. They have an extended 3D-network ofsilicates in which some silicon atoms are replaced by aluminium atoms, givingthem an AlтИТOтИТSi framework. The reactions taking place in zeolites are verysensitive to the pores and cavity size of the zeolites. Zeolites are commonlyused in the petrochemical industry.