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Besides conventional MCM-68, Al-rich MSE-type zeolites with a 12-10-10-ring micropore system were successfully synthesized in a remarkably short crystallization period by some different synthetic methods: (1) hydrothermal conversion of an FAU-type zeolite with the aid of the dipyrrolidinium-type organic structure-directing agent (OSDA) and (2) hydrothermal synthesis without using any OSDA with the...
Fe(II)-beta zeolites with a Si/Al molar ratio of 5, synthesized in the absence of an organic structure-directing agent, showed remarkably efficient NO chemisorption, as compared to conventional Si-rich beta zeolites (Si/Al=12–20) and common zeolites such as A-type zeolite, ZSM-5, and faujasite.
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