Two types of molecular sieve adsorbents(zeolites)were prepared from power plant residual circulation fluidized bed fly ash by hydrothermal reactions.The X and P zeolites were produced by baking without pretreating the raw materials.The XRD characterizations show that relative crystallinity of the X and P zeolites were 68%-75% and 55%,respectively.FeCl3 was employed for impregnation of Fe3+ on the X zeolite,and the effects of FeCl3 loading,impregnation temperature and contact time on the modified zeolite's c...