改性HZSM-5对正己烷芳构化性能的考察

Investigation on Modified HZSM 5 for Hexane Aromatization

用Ｇａ、Ｚｎ改性的ＨＺＳＭ－５对正己烷的芳构化性能进行了研究。在Ｇａ改性的ＨＺＳＭ－５上，Ｇａ含量存在一最佳值，此时芳烃收率和氢气收率最大。Ｚｎ改性ＨＺＳＭ－５后提高了芳烃收率，催化剂中Ｚｎ含量达一定值后再增加，芳烃收率变化不大；Ｚｎ含量过高，氢解反应加剧。在Ｇａ／ＨＺＳＭ－５中引入Ｎｉ、Ｃｒ或Ｚｎ后提高了芳烃收率，Ｚｎ、Ｃｒ的引入显著提高了Ｇａ／ＨＺＳＭ－５的脱氢功能，Ｎｉ有较强的氢解作用。

Aromatization of hexane on HZSM 5 modified with Ga or Zn was studied.For Ga/HZSM 5,there existed an optimum Ga content,at which the catalyst gave maximum yields of aromatic hydrocarbons and hydrogen.Aromatic hydrocarbons yield was increased by loading Zn on HZSM 5.No significant change in aromatics yield was observed when Zn content on HZSM 5 increased to a certain value,but hydrocracking activity of the catalyst increased.Aromatic yield over Ga/HZSM 5 was increased by loading Zn,Cr or Ni,the latter increased the hydrocracking activity.