期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 310, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110617
关键词
Germanosilicate; High Ge content; Topotactic structural transformation; Epoxide hydration
类别
资金
- National Natural Science Foundation of China [21872052, 21533002, 21972044]
- Ministry of Science and Technology of the People's Republic of China [2016YFA0202804]
The successful structural conversion process from Ge-rich IWW-type germanosilicate to IPC-18 zeolite under mild conditions of water medium and room temperature demonstrated promising catalytic performance in the hydration of ethylene oxide to ethylene glycol with a high selectivity of 96%.
A facile structural conversion process from Ge-rich IWW-type germanosilicate to its daughter structure IPC-18 zeolite has been developed under mild conditions of water medium and room temperature. The parent IWW zeolite with an extremely low Si/Ge ratio of 1.02, synthesized with 1,4-bis-(dimethyl-1-adamantylammonium)-butane as a novel structural directing agent, was critical for the success of this specific structural transformation. The high Ge content favored the breaking of double-four-ring (d4r) subunits under mild conditions and simultaneously the mild H2O medium suppressed the Si-assisted structural repairing. The HRTEM images collected along the (001) and (010) orientations of IWW and IPC-18 zeolite revealed the occurrence of structural transformation. The formation of IPC-18 zeolite structure was confirmed by the PXRD patterns and selected area electron diffraction patterns. The obtained IPC-18 zeolite demonstrated promising catalytic performance in the hydration of ethylene oxide to ethylene glycol with a high selective of 96%.
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