State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.
Instituto de Tecnologia Quimica, Universidad Politecnica de Valencia, Consejo Superior de Investigaciones Cientificas, Valencia, 46022, Spain.
Science. 2016 Mar 11;351(6278):1188-91. doi: 10.1126/science.aaf1559.
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 (•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.
在碱性介质中沸石的水热结晶过程中，氢氧根离子（OH(-)）通过打断 Si,Al-O-Si,Al 键来催化铝硅酸盐凝胶的解聚，并通过重新形成 Si,Al-O-Si,Al 键来催化水合阳离子周围的铝硅酸盐阴离子的聚合。我们报道了在水热条件下，羟基自由基（•OH）参与了沸石的结晶过程。通过紫外线照射或芬顿试剂产生的羟基自由基可以加速沸石-如 Na-A、Na-X、NaZ-21 和 silicalite-1-的结晶过程。
