Accelerated crystallization of zeolites via hydroxyl free radicals

In the hydrothermal crystallization of zeolites from basic media, hydroxide ions (OH⁻) catalyze the depolymerization of the aluminosilicate gel by breaking the Si,AI–O–Si,AI bonds and catalyze the polymerization of the aluminosilicate anions around the hydrated cation species by remaking the Si,AI–O...

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Published inScience (American Association for the Advancement of Science) Vol. 351; no. 6278; pp. 1188 - 1191
Main Authors Feng, Guodong, Cheng, Peng, Yan, Wenfu, Boronat, Mercedes, Li, Xu, Su, Ji-Hu, Wang, Jianyu, Li, Yi, Corma, Avelino, Xu, Ruren, Yu, Jihong
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 11.03.2016
The American Association for the Advancement of Science
Subjects
Aluminum
Anions
Crystallization
Fentons reagent
Free radicals
Hydroxyl radicals
Irradiation
Minerals
Ultraviolet radiation
Zeolites
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Summary:In the hydrothermal crystallization of zeolites from basic media, hydroxide ions (OH⁻) catalyze the depolymerization of the aluminosilicate gel by breaking the Si,AI–O–Si,AI bonds and catalyze the polymerization of the aluminosilicate anions around the hydrated cation species by remaking the Si,AI–O–Si,AI bonds. We report that hydroxyl free radicals (•OH) are involved in the zeolite crystallization under hydrothermal conditions. The crystallization processes of zeolites—such as Na–A, Na–X, NaZ–21, and silicalite-1—can be accelerated with hydroxyl free radicals generated by ultraviolet irradiation or Fenton's reagent.
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ISSN:0036-8075
1095-9203
1095-9203
DOI:10.1126/science.aaf1559