Effect of template type and template/silica mole ratio on the crystallinity of synthesized nanosized ZSM-5

被引：75

作者：

Fouad, O. A. ^{[1
]}

Mohamed, R. M. ^{[1
]}

Hassan, M. S. ^{[1
]}

Ibrahim, I. A. ^{[1
]}

机构：

[1] CMRDI, Cent Met Res & Dev Inst, Cairo 11421, Egypt

来源：

CATALYSIS TODAY | 2006年 / 116卷 / 01期

关键词：

nanosized; ZSM-5; templates; template/silica mole ratios; crystallinity;

D O I：

10.1016/j.cattod.2006.03.004

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The crystallinity of nanosized ZSM-5 zeolite from precursors mixtures containing different template types, tetramethylammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, and different template/ silica mole ratios, 0.215, 0.322, 0.43 and 0.537, has been studied. The produced samples were investigated using XRD, SEM, FT-IR and BET surface area measurements. Physicochemical investigations showed that the obtained products by different type of templates and different template/silica mole ratios were ZSM-5 phase. The as-synthesized ZSM-5 sample prepared by using tetrapropyl ammonium hydroxide template and 0.215 template/silica mole ratio at 230 degrees C for 45 h had the highest crystallinity. It was found that the average crystallite size increased in the following order; tetramethyl < tetrabutyl < tetraethyl < tetrapropyl and surface area increased in the following order: TMAOH < TEAOH < TBAOH < TPAOH. By increasing template/silica mole ratios from 0.215 to 0.537 the surface area decreased and average crystallite size increased. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：82 / 87

页数：6