Synthesis of ZSM-5 zeolite in fluoride media: an innovative approach to tailor both crystal size and acidity

被引:83
|
作者
Louis, B [1 ]
Kiwi-Minsker, L [1 ]
机构
[1] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Lab Chem React Engn, LGRC, CH-1015 Lausanne, Switzerland
关键词
ZSM-5; zeolite; fluoride anions; hammet acidity; H-0; structured catalytic materials;
D O I
10.1016/j.micromeso.2004.06.016
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
ZSM-5 zeolites were prepared at neutral pH by fluoride-mediated synthesis. The degree of crystallinity, the specific surface area and the crystal size are higher than those of the zeolites prepared under alkaline conditions. Moreover, by varying the F/Si ratio from 0.3 to 1.6, the H-[F]-ZSM-5 zeolites with crystal size ranging from 10 to 75 mum and the specific surface areas from 60 up to 350 m(2)/g were obtained. Temperature programmed desorption of pyridine was applied to characterize the zeolite acidity. A decrease of the number of Bronsted acid sites with a higher F/Si ratio in the starting synthesis solution was observed. Based on the Hammett acidity function H-0, a model has been developed to correlate the Bronsted acidity of the resulting zeolitic material with the amount. of fluoride anions introduced. Thus, ZSM-5 zeolites with tailored properties both at the molecular and microscopic levels are obtained. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:171 / 178
页数:8
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