Ke Quanli, Sun Tianjun, Cheng Hao, Chen Haijun, Liu Xiaowei, Wei Xiaoli, Wang Shudong
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, P. R. China.
University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P.R. China.
Chem Asian J. 2017 May 18;12(10):1043-1047. doi: 10.1002/asia.201700303. Epub 2017 May 8.
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 removal, making them promising candidates for diesel exhaust treatment.
以碱金属-冠醚（AMCE）配合物作为有机结构导向剂（OSDA）直接合成了高硅RHO沸石。从紫外-可见光谱和沸石图谱可以看出，冠醚-铯阳离子相互作用对提高沸石骨架中的硅含量具有关键作用。合成的RHO沸石的硅铝比（SAR）值比其传统形式的硅铝比大高达四倍，这使得它们即使在800°C水热老化后仍具有极其刚性的骨架。与商业沸石相比，铜交换的高硅RHO沸石在NO脱除方面表现出相当高的反应活性，使其成为柴油废气处理的有前途的候选材料。
