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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 Al−O−Si 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.