Synthesis and characterization of zeolite L

Title
Synthesis and characterization of zeolite L
Authors
Ahn, WS.
Keywords
AROMATIZATION
Issue Date
1999-02
Publisher
KOREAN CHEMICAL SOC
Abstract
Substantial reduction in synthesis time was achieved for zeolite L crystallization by attempting a hydrothermal synthesis at elevated temperature of 443K in a Na+/K+ mixed alkali system. Pure zeolite L could be obtained from a gel with the molar composition 5.3K(2)O-5.7Na(2)O-Al2O3-30SiO(2)-500H(2)O after 24h. Zeolite L could be obtained in high purity at the optimum Na2O/(K2O+Na2O) ratio of around 0.5, whilst zeolite W was formed when the Na2O/(K2O+Na2O) ratio was more than 0.66. The crystalline zeolite L samples obtained were characterized by means of elemental chemical analysis, XRD, SEM, FTi.r. spectroscopy, and particle size analyzer. In addition, two probe reaction studies were conducted. In toluene alkylation, H-L catalyst showed high catalytic activity at the beginning, but was deactivated quickly probably due to one-dimensional pore structure being blocked by the coke formed. High amounts of trimethylbenzene or diethylbenzene were observed due to the large 12-membered ring pore structure of zeolite I,. Pt/NaKL catalyst prepared showed a high conversion of n-hexane and high selectivity to benzene in n-hexane aromatization reaction.
URI
http://dspace.inha.ac.kr/handle/10505/20344
ISSN
0253-2964
Appears in Collections:
College of Engineering(공과대학) > Chemical Engineering (화학공학) > Journal Papers, Report (화학공학 논문, 보고서)
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