Ion exchange and thermal stability of hierarchical Y zeolites obtained by the acid and subsequent base treatments of commercial NaY zeolite were studied. It was found that the resulting hierarchical Y zeolite exhibited lower lanthanum ion exchange efficiency and thermal stability compared to the parent NaY zeolite. The introduction of lanthanum in the hierarchical Y zeolite significantly enhanced its thermal stability due to the advantageous combination of the stabilized effect of lanthanum and the reduced content of residual sodium ions. The latter was of paramount importance because the presence of sodium ions promoted breakdown of the hierarchical Y zeolite framework by dislodging aluminum enriched on the zeolite surface during the base treatment. Notably, the generated mesopores facilitated removal of residual sodium ions during the ammonium ion exchange treatment. Consequently, the hierarchical Y zeolite displayed superior thermal/hydrothermal stability even with a low La loading of 3 w t.%.

研究了用酸和随后的商品化NaY沸石进行碱处理后得到的分级Y沸石的离子交换和热稳定性。已发现，与母体NaY沸石相比，所得分层Y沸石显示出较低的镧离子交换效率和热稳定性。由于镧的稳定作用和减少的残留钠离子含量的有利结合，在分层Y型沸石中引入镧显着提高了其热稳定性。后者是最重要的，因为钠离子的存在通过在碱处理过程中驱散富集在沸石表面的铝促进了Y型沸石骨架的分解。值得注意的是 产生的中孔有助于铵离子交换处理过程中残留钠离子的去除。因此，即使在3wt。％的低La负载下，分层Y型沸石也显示出优异的热/水热稳定性。