Influences of alkaline treatment on the structure and catalytic performances of ZSM-5/ZSM-11 zeolites with alumina as binder
Influences of alkaline treatment on the structure and catalytic performances of ZSM-5/ZSM-11 zeolites with alumina as binder
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碱处理对氧化铝为粘结剂ZSM-5/ZSM-11沸石结构及催化性能的影响
DOI：
10.1016/j.molcata.2010.12.007
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发表时间：
2011-02-14
影响因子：
--
通讯作者：
Xu, Longya
中科院分区：
文献类型：
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作者：
Li, Xiujie;Wang, Chuanfu;Xu, Longya
研究了碱处理对以氧化铝为粘结剂的ZSM-5/ZSM-11复合分子筛在不同制备步骤的结构和催化性能的影响。铵程序升温脱附（NH（3）-TPD）和吡啶红外（Py-IR）光谱表明，碱处理顺序改变了ZSM-5/ZSM-11-Al（2）O（3）样品中酸性的分布和数量。通过碱处理产生的中孔被发现有利于芳香族分子的扩散，如通过使用锥形元件振荡微量天平（TEOM）的二甲苯吸收实验所确定的。在1-己烯异构化和芳构化反应中，挤出后经碱处理的样品与其他经过不同处理顺序的样品相比，表现出优异的芳构化活性和稳定性。催化性能的提高主要是由于酸中心的重新分布和介孔的引入。(C)2011 Elsevier B. V.保留所有权利。
Influences of alkaline treatment on the structural properties and catalytic performances of ZSM-5/ZSM-11 composite zeolites with alumina as binder at different preparation steps were studied in the present investigation. Temperature-programmed desorption of ammonium (NH(3)-TPD) and pyridine infrared (Py-IR) spectra revealed that alkaline treatment sequences changed both the distribution and amount of the acidities in the ZSM-5/ZSM-11-Al(2)O(3) samples. The mesopores created by alkaline treatment were found beneficial for the diffusion of aromatic molecules, as determined by the xylene-uptake experiments using a tapered element oscillating microbalance (TEOM). In 1-hexene isomerization and aromatization reactions, the sample after extrusion followed by alkaline treatment exhibited excellent aromatization activity and stability compared with other samples undergoing different treatment sequences. The enhanced catalytic performance could be attributed to the redistribution of acid sites and introduction of more mesopores. (C) 2011 Elsevier B.V. All rights reserved.