Effect of acidity and anions on synthesis of AFI molecular sieves in wide pH range of 3-10

Sung Hwa Jhung; Young Kyu Hwang; Jong San Chang; Sang Eon Park

doi:10.1016/j.micromeso.2003.10.012

Effect of acidity and anions on synthesis of AFI molecular sieves in wide pH range of 3-10

Sung Hwa Jhung, Young Kyu Hwang, Jong San Chang, Sang Eon Park

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

The effect of various anions such as chloride, nitrate, sulfate, acetate and fluoride on the synthesis of AFI molecular sieves using microwave irradiation was investigated. The crystallization yield and crystal size increased with the decrease in pH of the reaction gel from 10 to 3 except the fluoride anion. By contrast, fluoride anion exhibited an opposite trend. Moreover, AFI molecular sieve in a rod shape having a very high aspect ratio of about 40 was obtained with the addition of fluoride. The decrease in the crystallization yield and the formation of long crystals is attributable to the effect of fluoride that dissolves the reaction gel by forming metal fluoride and thus retards the fast nucleation and crystal growth.

Original language	English
Pages (from-to)	151-157
Number of pages	7
Journal	Microporous and Mesoporous Materials
Volume	67
Issue number	2-3
DOIs	https://doi.org/10.1016/j.micromeso.2003.10.012
State	Published - 6 Feb 2004

Keywords

Acidity
AFI molecular sieve
Anion
HF
Microwave irradiation
Rod-like crystal

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10.1016/j.micromeso.2003.10.012

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title = "Effect of acidity and anions on synthesis of AFI molecular sieves in wide pH range of 3-10",

abstract = "The effect of various anions such as chloride, nitrate, sulfate, acetate and fluoride on the synthesis of AFI molecular sieves using microwave irradiation was investigated. The crystallization yield and crystal size increased with the decrease in pH of the reaction gel from 10 to 3 except the fluoride anion. By contrast, fluoride anion exhibited an opposite trend. Moreover, AFI molecular sieve in a rod shape having a very high aspect ratio of about 40 was obtained with the addition of fluoride. The decrease in the crystallization yield and the formation of long crystals is attributable to the effect of fluoride that dissolves the reaction gel by forming metal fluoride and thus retards the fast nucleation and crystal growth.",

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T1 - Effect of acidity and anions on synthesis of AFI molecular sieves in wide pH range of 3-10

AU - Jhung, Sung Hwa

AU - Hwang, Young Kyu

AU - Chang, Jong San

AU - Park, Sang Eon

PY - 2004/2/6

Y1 - 2004/2/6

N2 - The effect of various anions such as chloride, nitrate, sulfate, acetate and fluoride on the synthesis of AFI molecular sieves using microwave irradiation was investigated. The crystallization yield and crystal size increased with the decrease in pH of the reaction gel from 10 to 3 except the fluoride anion. By contrast, fluoride anion exhibited an opposite trend. Moreover, AFI molecular sieve in a rod shape having a very high aspect ratio of about 40 was obtained with the addition of fluoride. The decrease in the crystallization yield and the formation of long crystals is attributable to the effect of fluoride that dissolves the reaction gel by forming metal fluoride and thus retards the fast nucleation and crystal growth.

AB - The effect of various anions such as chloride, nitrate, sulfate, acetate and fluoride on the synthesis of AFI molecular sieves using microwave irradiation was investigated. The crystallization yield and crystal size increased with the decrease in pH of the reaction gel from 10 to 3 except the fluoride anion. By contrast, fluoride anion exhibited an opposite trend. Moreover, AFI molecular sieve in a rod shape having a very high aspect ratio of about 40 was obtained with the addition of fluoride. The decrease in the crystallization yield and the formation of long crystals is attributable to the effect of fluoride that dissolves the reaction gel by forming metal fluoride and thus retards the fast nucleation and crystal growth.

KW - Acidity

KW - AFI molecular sieve

KW - Anion

KW - HF

KW - Microwave irradiation

KW - Rod-like crystal

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DO - 10.1016/j.micromeso.2003.10.012

M3 - Article

AN - SCOPUS:0742288017

SN - 1387-1811

VL - 67

SP - 151

EP - 157

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

IS - 2-3

ER -

Effect of acidity and anions on synthesis of AFI molecular sieves in wide pH range of 3-10

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