Theβ-Zeolite Synthesized by Dry-gel Conversion Method without the Use of Sodium Hydroxide : Characterization and Catalytic Behaviors
Theβ-Zeolite Synthesized by Dry-gel Conversion Method without the Use of Sodium Hydroxide : Characterization and Catalytic Behaviors
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不使用氢氧化钠的干凝胶转化法合成β-沸石：表征和催化行为
DOI：
10.1166/jnn.2009.j073
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Y. Sugi
中科院分区：
文献类型：
--
作者：
A. Sakthivel;A. Iida;K. Komura;Y. Sugi
首次采用干凝胶转化法（DGC），在不使用氢氧化钠的条件下合成了纳米级沸石分子筛。所得的α-沸石具有35-80 nm的粒度，SiO2/Al 2 O3比为25-400。它们的BET表面积为290-750 m2·g-1，外表面积为41-283 m2·g-1：累积表面积为420-1050 m2·g-1。通过在干凝胶制备过程中引入这些金属硝酸盐，合成了用碱土金属和稀土金属物种（如Ca、La和Ce）改性的β-沸石。为了评价这些分子筛的催化性能，它们被应用于己烷异构化/裂解和苯酚辛基化反应。Ca、La和Ce氧化物对催化性能的影响也进行了研究。
The nano-sized -zeolites were synthesized first time by dry gel conversion (DGC) method without the use of sodium hydroxide. Resultant -zeolites had particle size of 35–80 nm with SiO2/Al2O3 ratios in the range of 25–400. They had BET surface areas in the range of 290–750 m2·g−1 and the external surface area of 41–283 m2·g−1: cumulative surface areas were in the range of 420–1050 m2·g−1. -Zeolites modified with alkaline earth and rare earth metal species, such as Ca, La, and Ce, were synthesized by the introduction of these metal nitrates during the dry-gel preparation. To evaluate catalytic properties of these zeolites, they were applied for the isomerization/cracking of hexane and the phenol octylation. The influence of Ca, La, and Ce oxides on the catalytic properties was also examined.