关键词: 粉煤灰沸石;煤气脱汞;超临界水热合成;贵金属改性

Abstract: A series of coal fly ash ( CFA ) zeolites were prepared by supercritical hydrothermal method with fly ash as raw material .Firstly, the Hg0 removal performance of zeolite prepared from different kinds of coal fly ash and the Hg 0 removal activity of zeolite prepared from the same coal fly ash were investigated .Secondly , the influences of the activity evaluation temperature and H 2 S gas on the Hg 0 removal performance of CFA zeolites were studied .The results show that two types of CFA zeolites have better Hg0 removal activity.The CFA zeolite with sodalite crystal ( Z5s) type has better Hg0 removal property than that of cancrinite crystal (Z5c).The Hg0 removal rate of Z5c and Z5s remaines above 90%in 360 min.H2 S gas in the atmosphere is beneficial to the removal of Hg 0 , and the Hg 0 removal rate decreases when the temperature rises .The Z5 s modified by Pd has a better activity for Hg 0 removal at mid-temperature than Z5s.

Key words: CFA zeolite;Hg0 removal from the coal-derived fuel gas;supercritical hydrothermal synthesis;noble metal modified