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Nanosized NaY crystals have been prepared from metakaolin and sodium silicate by confined space synthesis with starch additive.It is found that the product has a narrow crystal size distribution (50-100 nm),high Si/Al ratio (Si/Al=4.6-6.1),high surface area (1090 m2/g) and the average diameter of nanosized NaY (75 nm) synthesized is 30 nm,it is smaller than that of without starch additive.