To develop effective catalysts for α-pinene isomerization reaction is important to get high valuable products. A hierarchical mordenite molecular sieve is prepared using alkaline treatment assisted by the microwave radiation. After the alkaline treatment, the relative crystalline decreases by ∼20% and mesopores are introduced in the mordenite molecular sieve. Compared to conventional heating method, microwave assisted alkaline treatment exhibits a selective etching of zeolitic silicon atoms. Aluminum atoms adjacent to silicon atoms are extracted to form Al-OH hydroxyl groups. These extracted aluminum atoms are reconnected to zeolitic silicon atoms. Mordenite after microwave assisted alkaline treatment has a good dispersion of mesopores, higher retention of BrØnsted acid sites in 12-membered rings, and lower concentration of Lewis acid sites. The isomerization reaction of α-pinene suggests that alkaline treatment increases the accessibility of acid sites for α-pinene molecules. The hierarchical porosity increases the conversion of α-pinene from 46.1 to 94.7%. The yields for camphene and limonene increase by 17.0 and 5.4%, respectively. Disproportionation of limonene is inhibited when using microwave assisted alkaline treated mordenite due to a low concentration of Lewis acid sites. These results are important to propose a facile post modification method to realize a selective extraction of zeolitic framework atoms.

开发有效的α催化剂-pine烯异构化反应对于获得高价值的产品很重要。在微波辐射的辅助下，通过碱处理制备出丝光沸石分子筛。碱处理后，相对结晶减少约20％，并将中孔引入丝光沸石分子筛中。与常规加热方法相比，微波辅助碱处理对沸石硅原子具有选择性蚀刻作用。提取与硅原子相邻的铝原子以形成Al-OH羟基。这些提取的铝原子重新连接到沸石硅原子上。微波辅助碱处理后的丝光沸石具有良好的中孔分散性，布朗斯台德酸位在12元环中的保留更高，路易斯酸位的浓度较低。的异构化反应α- pine烯表明碱处理增加了α- pine烯分子的酸性位点的可及性。分级孔隙率使α- pine烯的转化率从46.1增加到94.7％。camp烯和li烯的产率分别提高了17.0％和5.4％。当使用微波辅助的碱处理的丝光沸石时，由于路易斯酸位点的浓度低，柠檬烯的歧化被抑制。这些结果对于提出一种简便的后改性方法以实现对沸石骨架原子的选择性提取非常重要。