Effect of phosphorus and water contents on physico-chemical properties of SAPO-34 molecular sieve

被引：22

作者：

Sedighi, Mehdi ^{[1
]}

Towfighi, Jafar ^{[1
]}

Mohamadalizadeh, Ali ^{[2
,3
]}

机构：

[1] Tarbiat Modares Univ, Dept Chem Engn, Tehran, Iran

[2] Res Inst Petr Ind, Gas Res Div, Tehran 146651998, Iran

[3] Polytech Montreal, Dept Chem Engn, Montreal, PQ H3C 3A7, Canada

来源：

POWDER TECHNOLOGY | 2014年 / 259卷

关键词：

Crystallinity; Crystal size; Morphology; Bronsted acid site; Surface area; METHANOL CONVERSION; CATALYTIC-ACTIVITY; OLEFINS; CRYSTALLIZATION; TEMPLATES; SILICA;

D O I：

10.1016/j.powtec.2014.03.045

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

SAPO-34 molecular sieves with different P and H2O contents were synthesized by adjusting P2O5/Al2O3 and H2O/Al2O3 molar ratios in starting gel. The crystal structure, crystal size, elemental composition, and acid site density of the synthesized samples were characterized with XRD, SEM, ICP, TPD, and FTIR. The morphology, crystallinity, and acidity of SAPO-34 materials varied with P2O5/Al2O3 and H2O/Al2O3 molar ratios in the starting gel and different Si substitution mechanisms were accompanied correspondingly. Samples with P2O5/Al2O3 and H2O/Al2O3 molar ratios of 1 and 60 had the best crystallinity with the largest crystals and maximum surface area. Increasing the concentration of strong acidic hydroxyl groups for samples SP-1 and SW-60 indicated the presence of a higher amount of Bronsted add sites. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：81 / 86

页数：6

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