Properties of ZSM-5 zeolite by exchanging with ammonia nitrogen filtrate
The HZSM-5-L zeolite and the HZSM-5-A zeolite were obtained by exchanging with am-monia nitrogen filtrate and pure ammonium salt so-lution from Lanzhou Petrochemical Company of PetroChina,respectively.The ZSM-5 zeolite was characterized by X-ray diffractometer,X-ray fluo-rescence spectrometer,scanning electron micro-scope,specific surface and aperture distribution me-ter,and the catalytic performance of the catalysts prepared by the two zeolites was evaluated.The re-sults showed that qualified zeolite products with rel-ative crystallinity of 93%,mass fraction of Na2O of 0.22%and total specific surface area of 362.84 m2/g could be obtained by using ammonia nitrogen con-taining filtrate as exchange solution.Taking the catalytic cracking raw oil as the evaluation raw ma-terial,the total liquid yield of the catalyst prepared by HZSM-5-L was 0.19 percentage points higher than that prepared by HZSM-5-A,the coke yield was 0.32 percentage points lower,and the propylene yield was basically the same.This could not only re-duce the production cost of ZSM-5 zeolite,but also reduce the cost of ammonia-nitrogen treatment.
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