In this work, hierarchical HZSM-5 zeolites, with the high Si/TPA⁺ ratio of 34 and Si/Al ratios of 100 and 30, have been synthesized by the mesoporogen-free, Na⁺-free, and steam-assisted crystallization route using industrial silica sol as the silicon source. Highly crystalline HZSM-5 (30)-34 sample inherited the strong acidity of conventional HZSM-5 and exhibited the relatively large mesopore volume (0.08 ​cm³ ​g⁻¹). With this structure, the accessibility of Brønsted acidity sites is increased from 6.25% of conventional HZSM-5 to 64.3% of HZSM-5 (30)-34, which enhanced the catalytic cracking performance of low-density polyethylene (LDPE). As a result, the decomposition temperature of LDPE was reduced to 420 ​°C, which is apparently lower than 482 ​°C when no catalyst was adopted. Moreover, the HZSM-5 (30)-34 sample showed good reusability and catalytic stability in the regeneration-recycle experiments.

在这项工作中，通过无介孔原，无Na ⁺和蒸汽辅助结晶途径合成了具有高Si ​​/ TPA ⁺比34和Si / Al比100和30的分层HZSM-5沸石使用工业硅溶胶作为硅源。高结晶度HZSM-5（30）-34样品继承了传统HZSM-5的强酸度，并显示出相对较大的中孔体积（0.08 cm ³  g ^-1）。通过这种结构，布朗斯台德酸性位点的可及性从常规HZSM-5的6.25％增加到HZSM-5（30）-34的64.3％，这增强了低密度聚乙烯（LDPE）的催化裂化性能。结果，LDPE的分解温度降低到420°C，这明显低于不采用催化剂时的482°C。此外，HZSM-5（30）-34样品在再生循环实验中显示出良好的可重用性和催化稳定性。