纳米Y分子筛聚集体的水热稳定及催化性能研究

Study on hydrothermal stability and catalytic performance of nano-Y molecular sieve aggregates

本文通过在硅铝酸盐体系中引入二甲基十六烷基[3-(三甲氧基硅基)丙基]氯化铵(TPHAC),制备得到了纳米Y分子筛聚集体(NM-NaY),然后经过离子交换及不同温度水热处理后得到了超稳分子筛(NMUSY),采用多种技术手段对NM-USY分子筛的物化性能进行了表征,并考察了USY分子筛的催化裂化性能。结果表明,650℃水热处理制备成的NM-USY分子筛,其介孔连通性较高,有更多的外表面酸以及抗积碳能力,450℃水热处理制备成的NM-USY分子筛,具有较高的三异丙基苯裂化活性以及较快的失活速率。

Nano-Y molecular sieve aggregates(NM-NaY)were prepared by introducing the dimethylhexadecyl[3-(trimethoxysilyl)propyl] ammonium chloride(TPHAC)into the aluminosilicate system.USY zeolites were obtained by ion-exchangeaned and hydro-thermal treatment of NM-NaY at different temperatures.The physical and chemical properties of NM-USY molecular sieve were characterized by various technical means,and the catalytic cracking performance of USY molecular sieve was investigated.The re-sults show that the NM-USY molecular sieve prepared by hydrothermal treatment at 650℃ has higher mesoporous connectivity,more outer surface acid and ability to resist coking,and the NM-USY molecular sieve prepared by hydrothermal treatment at 450℃has higher trisopropylbenzene cracking activity and faster deactivation rate.