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论文类型：期刊论文

发表时间：2015-01-01

发表刊物：MICROPOROUS AND MESOPOROUS MATERIALS

收录刊物：SCIE、EI、Scopus

卷号：201

期号：C

页面范围：247-257

ISSN号：1387-1811

关键字：Zeolite T; Mesoporous zeolite; Hierarchical structure; Single template

摘要：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.