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Targeted Synthesis of Ultrastable High‐Silica RHO Zeolite Through Alkali Metal–Crown Ether Interaction
Author(s) -
Ke Quanli,
Sun Tianjun,
Cheng Hao,
Chen Haijun,
Liu Xiaowei,
Wei Xiaoli,
Wang Shudong
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201700303
Subject(s) - zeolite , crown ether , alkali metal , hydrothermal circulation , ether , materials science , metal , hydrothermal synthesis , chemical engineering , copper , inorganic chemistry , catalysis , chemistry , organic chemistry , metallurgy , ion , engineering
High‐silica RHO zeolite was directly synthesized using an alkali metal‐crown ether (AMCE) complex as organic structure‐directing agent (OSDA). Derived from the UV‐vis spectra and zeolite patterns, the crown ether‐cesium cation interaction was found to have crucial effect on the enhancement of silica content within the zeolite framework. The synthesized RHO zeolites possess up to four times larger silica/alumina ratio (SAR) values than that in their conventional form, which gives them extraordinarily rigid frameworks even after hydrothermal aging under 800 °C. Compared to commercial zeolites, copper‐exchanged high‐silica RHO zeolites demonstrate considerably high reaction activity in NO X removal, making them promising candidates for diesel exhaust treatment.