Improvement of Hydrothermal Stability of MCM-41 Using Salt Effects during the Crystallization Process
Improvement of Hydrothermal Stability of MCM-41 Using Salt Effects during the Crystallization Process
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DOI：
10.1021/jp962500d
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发表时间：
1997-01
影响因子：
3.3
通讯作者：
R. Ryoo;S. Jun
中科院分区：
文献类型：
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作者：
R. Ryoo;S. Jun
MCM-41分子筛在热水和水溶液中的水热稳定性较低是其许多应用的关键问题，与传统的沸石如Y和ZSM-5相比。在370 K水热晶化过程中，加入氯化钠、氯化钾、乙酸钠和乙二胺四乙酸四钠等盐，可以显著提高MCM-41的水热稳定性。高品质的MCM-41样品，通过使用盐效应表明可以忽略不计的结构损失，通过X射线衍射判断在沸水中加热12 h。
Low hydrothermal stability in hot water and aqueous solutions was a critical problem for many applications of the mesoporous molecular sieve MCM-41, compared with conventional zeolites such as Y and ZSM-5. The hydrothermal stability of MCM-41 has been found to improve remarkably by using various salts such as sodium chloride, potassium chloride, sodium acetate, and ethylenediaminetetraacetic acid tetrasodium salt during the hydrothermal crystallization process performed at 370 K. High-quality MCM-41 samples obtained by using the salt effect indicated negligible structural losses as judged by X-ray diffraction during heating for 12 h in boiling water.