The effect of H2O/SiO2 ratio in precursor solution on the crystal size and morphology of zeolite ZSM-5

被引：29

作者：

Sashkina, Kseniya A. ^{[1
,2
]}

Qi, Zhiye ^{[2
,3
]}

Wu, Wei ^{[3
]}

Ayupov, Artem B. ^{[1
]}

Lysikov, Anton I. ^{[1
,2
]}

Parkhomchuk, Ekaterina V. ^{[1
,2
]}

机构：

[1] Boreskov Inst Catalysis SB RAS, 5 Lavrentieva St, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia

[3] Heilongjiang Univ, Sch Chem & Mat Sci, Harbin 150080, Peoples R China

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2017年 / 244卷

关键词：

ZSM-5; Crystal size/morphology control; Aggregate-like hollow crystals; LIGHT-SCATTERING; MOLECULAR-SIEVES; INITIAL-STAGE; CRYSTALLIZATION; GROWTH; TPA-SILICALITE-1; NUCLEATION; PARTICLES; MECHANISM; BEHAVIOR;

D O I：

10.1016/j.micromeso.2017.02.060

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A series of zeolites ZSM-5 has been synthesized in hydrothermal conditions under various ratios of H2O/SiO2 ranging from 10 to 300. Materials have been characterized by X-ray diffraction, scanning and transmission electron microscopy, nitrogen adsorption measurements, X-ray fluorescence spectrometry, inductively coupled plasma optical emission spectrometry and temperature-programmed desorption of ammonia. The effect of H2O/SiO2 ratio in precursor solution on ZSM-5 product yield, crystallinity, crystal size, crystal size distribution, morphology, texture and acidity has been studied. The increase of H2O/SiO2 ratio in precursor solution from 10 to 300 results in decreasing the average crystal size from 1250 to 180 nm, the higher H2O/SiO2 ratio, the wider crystal size distribution. Aggregate-like mesoporous/hollow ellipsoid crystals and smooth pill-shaped crystals have been produced from precursor solutions with H2O/SiO2 = 25-100 and H2O/SiO2 = 10; 300, respectively. The average size of domains forming aggregate-like crystals is 40-50 nm. The specific acidity of ZSM-5 samples, synthesized from precursor solutions with different H2O/SiO2 molar ratios and the same Si/AI, has a trend to decrease along with the average crystal size increase. (C) 2017 Elsevier Inc. All rights reserved.

引用

页码：93 / 100

页数：8

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