Journal
SCIENCE
Volume 351, Issue 6278, Pages 1188-1191Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf1559
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Funding
- 973 Project [2014CB931802, 2013CB921802]
- National Natural Science Foundation of China [21320102001, 91122029, 21571075]
- Program Severo Ochoa
- [ERC-AdG-2014-671093-SynCatMatch]
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In the hydrothermal crystallization of zeolites from basic media, hydroxide ions (OH-) catalyze the depolymerization of the aluminosilicate gel by breaking the Si, Al-O-Si, Al bonds and catalyze the polymerization of the aluminosilicate anions around the hydrated cation species by remaking the Si, Al-O-Si, Al bonds. We report that hydroxyl free radicals (center dot 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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