Synthesis of low-silica CHA zeolite chabazite in fluoride media without organic structural directing agents and zeolites

Bo Liu; Yihong Zheng; Na Hu; Tian Gui; Yuqin Li; Fei Zhang; Rongfei Zhou; Xiangshu Chen; Hidetoshi Kita

doi:10.1016/j.micromeso.2014.05.019

Synthesis of low-silica CHA zeolite chabazite in fluoride media without organic structural directing agents and zeolites

Bo Liu, Yihong Zheng, Na Hu, Tian Gui, Yuqin Li, Fei Zhang, Rongfei Zhou, Xiangshu Chen, Hidetoshi Kita

COLLEGE OF CHEMICAL ENGINEERING

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

81 Scopus citations

Abstract

The fluoride route was adopted for the preparation of chabazite (Si/Al = 2.5-3.5) in the absence of organic structural directing agents (OSDAs). The crystallization kinetics of the fluoride-derived chabazite and the effects of gel SiO₂/Al₂O₃ ratio, gel F^-/ SiO₂ ratio, fluoride source and synthesis temperature on the morphology and composition of crystals were investigated. A certain amount of the specific fluoride source (NH₄F) dominated the crystallization of CHA phase in the competitive growth of MER/CHA phases. The fluoride-derived chabazite by in situ synthesis had a particle size of 15-20 μm. Seeded-in-gel synthesis increased the crystallization rate and resulted in the smaller crystals with higher BET surface area and microspore volume. The location of fluoride ion in zeolite framework and the role of fluoride salts on chabazite crystallization were also demonstrated.

Original language	English
Pages (from-to)	270-276
Number of pages	7
Journal	Microporous and Mesoporous Materials
Volume	196
DOIs	https://doi.org/10.1016/j.micromeso.2014.05.019
State	Published - 15 Sep 2014

Keywords

Chabazite
Fluoride media
In situ synthesis
MAS NMR
OSDA-free

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10.1016/j.micromeso.2014.05.019

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title = "Synthesis of low-silica CHA zeolite chabazite in fluoride media without organic structural directing agents and zeolites",

abstract = "The fluoride route was adopted for the preparation of chabazite (Si/Al = 2.5-3.5) in the absence of organic structural directing agents (OSDAs). The crystallization kinetics of the fluoride-derived chabazite and the effects of gel SiO2/Al2O3 ratio, gel F-/ SiO2 ratio, fluoride source and synthesis temperature on the morphology and composition of crystals were investigated. A certain amount of the specific fluoride source (NH4F) dominated the crystallization of CHA phase in the competitive growth of MER/CHA phases. The fluoride-derived chabazite by in situ synthesis had a particle size of 15-20 μm. Seeded-in-gel synthesis increased the crystallization rate and resulted in the smaller crystals with higher BET surface area and microspore volume. The location of fluoride ion in zeolite framework and the role of fluoride salts on chabazite crystallization were also demonstrated.",

keywords = "Chabazite, Fluoride media, In situ synthesis, MAS NMR, OSDA-free",

author = "Bo Liu and Yihong Zheng and Na Hu and Tian Gui and Yuqin Li and Fei Zhang and Rongfei Zhou and Xiangshu Chen and Hidetoshi Kita",

year = "2014",

month = sep,

day = "15",

doi = "10.1016/j.micromeso.2014.05.019",

language = "英语",

volume = "196",

pages = "270--276",

journal = "Microporous and Mesoporous Materials",

issn = "1387-1811",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Synthesis of low-silica CHA zeolite chabazite in fluoride media without organic structural directing agents and zeolites

AU - Liu, Bo

AU - Zheng, Yihong

AU - Hu, Na

AU - Gui, Tian

AU - Li, Yuqin

AU - Zhang, Fei

AU - Zhou, Rongfei

AU - Chen, Xiangshu

AU - Kita, Hidetoshi

PY - 2014/9/15

Y1 - 2014/9/15

N2 - The fluoride route was adopted for the preparation of chabazite (Si/Al = 2.5-3.5) in the absence of organic structural directing agents (OSDAs). The crystallization kinetics of the fluoride-derived chabazite and the effects of gel SiO2/Al2O3 ratio, gel F-/ SiO2 ratio, fluoride source and synthesis temperature on the morphology and composition of crystals were investigated. A certain amount of the specific fluoride source (NH4F) dominated the crystallization of CHA phase in the competitive growth of MER/CHA phases. The fluoride-derived chabazite by in situ synthesis had a particle size of 15-20 μm. Seeded-in-gel synthesis increased the crystallization rate and resulted in the smaller crystals with higher BET surface area and microspore volume. The location of fluoride ion in zeolite framework and the role of fluoride salts on chabazite crystallization were also demonstrated.

AB - The fluoride route was adopted for the preparation of chabazite (Si/Al = 2.5-3.5) in the absence of organic structural directing agents (OSDAs). The crystallization kinetics of the fluoride-derived chabazite and the effects of gel SiO2/Al2O3 ratio, gel F-/ SiO2 ratio, fluoride source and synthesis temperature on the morphology and composition of crystals were investigated. A certain amount of the specific fluoride source (NH4F) dominated the crystallization of CHA phase in the competitive growth of MER/CHA phases. The fluoride-derived chabazite by in situ synthesis had a particle size of 15-20 μm. Seeded-in-gel synthesis increased the crystallization rate and resulted in the smaller crystals with higher BET surface area and microspore volume. The location of fluoride ion in zeolite framework and the role of fluoride salts on chabazite crystallization were also demonstrated.

KW - Chabazite

KW - Fluoride media

KW - In situ synthesis

KW - MAS NMR

KW - OSDA-free

UR - http://www.scopus.com/inward/record.url?scp=84902475087&partnerID=8YFLogxK

U2 - 10.1016/j.micromeso.2014.05.019

DO - 10.1016/j.micromeso.2014.05.019

M3 - 文章

AN - SCOPUS:84902475087

SN - 1387-1811

VL - 196

SP - 270

EP - 276

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

ER -

Synthesis of low-silica CHA zeolite chabazite in fluoride media without organic structural directing agents and zeolites

Abstract

Keywords

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