Hydrothermal synthesis of hierarchical zeolite T aggregates using tetramethylammonium hydroxide as single template
Hydrothermal synthesis of hierarchical zeolite T aggregates using tetramethylammonium hydroxide as single template
复制标题
以四甲基氢氧化铵为单一模板剂水热合成多级孔沸石T聚集体
DOI：
10.1016/j.micromeso.2014.09.018
复制
发表时间：
2015-01-01
影响因子：
5.2
通讯作者：
Wang, Jinqu
中科院分区：
文献类型：
--
作者：
Yin, Xiaoyan;Li, Zhongfang;Wang, Jinqu
本文利用单模板（四甲基氢氧化铵，TMAOH），通过水热法制备了不同粒径的T级沸石聚集体。采用XRD、SEM、TEM和N-2吸附-脱附技术对产物进行了详细研究。研究了TMAOH和水的用量、结晶温度、预结晶、播种和老化等工艺参数对T型沸石团聚体合成的影响。合成的样品通常显示由紧密排列的原生纳米晶粒组成的柱状聚集体。样品的额外介孔归因于纳米晶体之间存在的间隙空隙。降低结晶温度、预结晶、播种和时效处理可以减小T型沸石团聚体的粒径，提高其介孔性能。在所有制备的样品中，首先在室温下静态时效48 h，然后在373 K下合成48 h的沸石T样品的BET表面积（S-BET）最高，为461 m(2)/g，介孔体积（V-meso）为0.231 cm(3)/g。本文提供了一种高效、简便的制备T级沸石聚集体的方法。(C) 2014爱思唯尔公司版权所有。
In this paper, the hierarchical zeolite T aggregates with different sizes have been successfully synthesized by hydrothermal method with the aid of single template (tetramethylammonium hydroxide, TMAOH). The products have been studied in detail by XRD, SEM, TEM and N-2 adsorption-desorption techniques. The influences of the preparation parameters including the amounts of TMAOH and water, crystallization temperature, pre-crystallization, seeding and aging on the synthesis of zeolite T aggregates have been investigated thoroughly. The synthesized samples typically display the column-like aggregates consisted of tightly packed primary nanocrystal grains. The additional mesopores of samples are attributed to the interstitial voids existing between the nanocrystals. The decreased crystallization temperature, pre-crystallization, seeding and aging disposals can reduce the particle sizes and improve the mesoporous properties of zeolite T aggregates. Among all the prepared samples, zeolite T sample which first statically aged at room temperature for 48 h and then synthesized at 373 K for 48 h had the highest BET surface area (S-BET) of 461 m(2)/g and mesopore volume (V-meso) of 0.231 cm(3)/g. This paper provides an efficient and facile route to prepare hierarchical zeolite T aggregates. (C) 2014 Elsevier Inc. All rights reserved.