Organotemplate-free, seed-directed, and rapid synthesis of Al-rich zeolite MTT with improved catalytic performance in isomerization of m-xylene

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• 作者：Qinming Wu ; Xiong Wang ; Xiangju Meng ; Chengguang Yang ; Yan Liu ; Yinying Jin ; Qi Yang ; Feng-Shou Xiao
• 关键词：Al-rich ZSM-23 ; Rapid synthesis ; Seed-directed ; Improved catalytic performance ; Isomerization of m-xylene
• 刊名：Microporous and Mesoporous Materials
• 出版年：1 March, 2014
• 年：2014
• 卷：186
• 期：Complete
• 页码：106-112
• 全文大小：1400 K

文摘

m-xylene isomerization over zeolites is of great importance because of the shortage of p-xylene currently. Here, we show an organotemplate-free, seed-directed, and rapid synthesis of Al-rich zeolite MTT (denoted as ZJM-6) with improved catalytic performance in isomerization of m-xylene to p-xylene. Physicochemical characterizations including XRD, SEM, Ar sorption isotherms, ²⁷Al NMR, and NH₃-TPD show that the zeolitic product has good crystallinity, uniform crystals, high surface area, tetrahedral Al³⁺ species, and abundant acidic sites. Interestingly, the crystallization of ZJM-6 takes very short time (5 h at 170 掳C), compared with conventional MTT zeolites (20 h at 170 掳C). Very importantly, catalytic tests for m-xylene isomerization show that H-form of ZJM-6 zeolite exhibits superior performance, which could be potentially important for industrial applications of ZJM-6 zeolite as a candidate in the future.