期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 186, 期 -, 页码 106-112出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2013.11.043
关键词
Al-rich ZSM-23; Rapid synthesis; Seed-directed; Improved catalytic performance; Isomerization of m-xylene
类别
资金
- National Natural Science Foundation of China [21273197, 21333009, U1162201]
- National High-Tech Research and Development program of China [2013AA065301]
- Science and Technology Innovative Team of Zhejiang Province [2012R10014-01]
- Fundamental Research Funds for the Central Universities [2013XZZX001]
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, Al-27 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 degrees C), compared with conventional MU zeolites (20 h at 170 degrees 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. (C) 2013 Elsevier Inc. All rights reserved.
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