Ga改性HZSM-5催化剂芳构化性能的考察

摘要

以不同温度水热处理的纳米HZSM 5为母体制备了Ga/HZSM-5催化剂,并对该催化剂的FCC汽油芳构化性能进行考察.结果表明:以600℃水热处理、硝酸洗涤的HZSM-5为母体制备的Ga/HZSM-5(GaHS600)的芳构化性能最优,当温度为480℃、WHSV为1h-1时,GaHS600上所得产品中芳烃和(C3+C4)体积分数分别为58.3％和7.6％.在本实验考察条件下,金属二次改性对Ga/HZSM-5芳构化性能的提高并无有利影响.%Ga/HZSM-5 catalysts were prepared using nano-scale HZSM-5 hydrothermally treated under various temperatures as base materials. The aromatization performances of Ga/HZSM-5 catalysts were investigated using full range FCC gasoline as feed. Results showed that Ga/HZSM-5 catalyst prepared with nano-HZSM-5 hydrothermally treated under 600 °C followed by HNO3 washing exhibited the best aromatization performance: under a reaction temperature of 480 °C and WHSV of 1 h-1 , the volume fraction of aromatics and(C3 + C4 ) in the product was 58. 3% and 7. 6% , respectively. When a second metal,such as Fe,Cu and Cr,was introduced into Ga/HZSM-5 catalyst,without positive effect on its aromatization performance was observed under the testing conditions.