Aluminosilicate zeolites are a group of microporous materials widely used in numerous technical applications as catalysts, adsorbents and ion exchangers. Zeolites are subjected to mechanical stress throughout their lifecycle, resulting in the loss of their crystallinity and micropore volume. Therefore, developing zeolites with excellent mechanical properties is important. Recently, our group has reported a liquid-mediated, defect-healing treatment to eliminate the silanol defects in aluminosilicate zeolites with high Si/Al ratios, resulting in imparting extreme chemical stability against water vapor, one of the major chemical damages to destroy zeolite structures. Herein, we investigate an influence of a liquid-mediated, defect-healing treatment on the intrinsic mechanical features of zeolites. ZSM-5 is selected as the target zeolite in this study. Silanol defects in the parent ZSM-5 (HSZ-890HOA, Tosoh) are eliminated by a liquid-mediated, defect-healing treatment. The parent and healed zeolites are subjected to planetary ball milling to compare their mechanical stabilities. Planetary ball-milling treatments, such as rotation at 600 rpm, degrade the crystalline structures of both the parent and healed ZSM-5 with an increase in duration. The diffraction peaks corresponding to the MFI-type structure in parent ZSM-5 completely diminish after planetary ball milling for 60 min. Conversely, diffraction peaks in healed ZSM-5 were retained after such operations, confirming that the mechanical stability of zeolites was enhanced by the liquid-mediated, defect-healing treatment.

中文翻译：

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通过缺陷修复处理提高 ZSM-5 沸石的机械稳定性

铝硅酸盐沸石是一组微孔材料，广泛用于多种技术应用，如催化剂、吸附剂和离子交换剂。沸石在其整个生命周期中都会受到机械应力，导致其结晶度和微孔体积的损失。因此，开发具有优异机械性能的沸石具有重要意义。最近，我们的小组报道了一种液体介导的缺陷修复处理，以消除高硅铝比的硅铝酸盐沸石中的硅烷醇缺陷，从而赋予对水蒸气的极端化学稳定性，水蒸气是破坏沸石结构的主要化学损伤之一。在此，我们研究了液体介导的缺陷修复处理对沸石固有机械特征的影响。本研究选择ZSM-5作为目标沸石。母体 ZSM-5（HSZ-890HOA，Tosoh）中的硅烷醇缺陷可通过液体介导的缺陷修复处理消除。对母体沸石和修复沸石进行行星球磨以比较它们的机械稳定性。行星球磨处理（例如以 600 rpm 的转速旋转）会随着持续时间的增加而降低母体和愈合后 ZSM-5 的晶体结构。行星球磨 60 分钟后，母体 ZSM-5 中 MFI 型结构对应的衍射峰完全消失。相反，在此类操作后，修复后的 ZSM-5 中的衍射峰得以保留，这证实了液体介导的缺陷修复处理增强了沸石的机械稳定性。