Affiliation:
1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University North Zhongshan Rd. 3663 Shanghai 200062 China
2. School of Physical Science and Technology & Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech University Shanghai 201210 China
3. State Key Laboratory of Petroleum Molecular and Process Engineering SKLPMPE Sinopec Research Institute of Petroleum Processing Co., LTD. Beijing 100083 China
4. East China Normal University Shanghai 200062 China
5. Institute of Eco-Chongming Shanghai 202162 China
Abstract
AbstractA multidimensional extra‐large pore zeolite with highly hydrothermal stability, denoted as −IRT−HS, has been developed successfully, starting from Ge‐rich germanosilicate precursor hydrothermally directed by a small and commercially available piperidinium‐type organic structure‐directing agent (OSDA). −IRT−HS, with the supermicropores, is structurally analogues to 28‐membered ring −IRT topology as confirmed by various spectroscopic techniques. And it is the high‐silica (Si/Ge=58) zeolite with the largest pore size as well. Notably, using acid‐washed as‐made Ge‐rich −IRT precursor as the silicon source is crucial to restore partially collapsed structure into a stable framework by OSDA‐assisted recrystallization. The calcined −IRT−HS maintains a high crystallinity, even when stored in a humid environment for extended periods or directly exposed to water. Additionally, high silica Al‐containing analogue is also readily synthesized, serving as an active solid‐acid catalyst in 1,3,5‐triisopropylbenzene cracking reaction, yielding an impressive initial conversion up to 76.1 % much higher than conventional large‐pore Beta zeolite (30.4 %). This work will pave the way for the designed synthesis of targeted high‐silica zeolites with stable and extra‐large pore frameworks, mimicking the structures of existing Ge‐rich counterparts.