Alkaline-acid treated mordenite and beta zeolites featuring mesoporous dimensional uniformity

作者：Liu Jinhuan; Cui Liang; Wang Liang; Ni Xiangqian; Zhang Shudong; Jin Yingjie^*

来源：Materials Letters, 2014, 132: 78-81.

DOI：10.1016/j.matlet.2014.06.027

• Porous materials
• Zeolite demetallation
• Hydrothermal alkali pre-etching
• Mesopore size uniformity
• Functional texture

Zeolites with MOR and BEA structures were treated by alkaline and acid media to regulate mesoporous structures in dimensional uniformity. The mesoporous modification approach (viz, hydrothermal alkali pre-etching, bulk alkali leaching and posterior acid extraction) was demonstrated by the introduction of uniform mesopore structures into MOR and BEA crystals. Two modified zeolites with well preserving crystallinity and substantial mesoporosity exhibited the disordered but uniform BJH pore-distribution character. The dimensionally uniformizing tendency of mesopore formation is attributed to the reinforced micropore-inducing effect due to the combination of hydrothermal alkali etching with bulk alkali leaching of enhancing mass transport. In addition to the mesopore size uniformity the mesoporosity development is more available for BEA structure than for MOR structure. Moreover, the alkaline-acid modification method proposed can facilitate the adjustment on framework Si/Al ratio towards two topological zeolites.

• 出版日期2014-10-1
• 单位辽宁石油化工大学