Luan Huimin, Zai Tianming, Wu Qinming, Meng Xiangju, Wu Jianping, Liu Weiliao, Sheng Na, Wang Han, Xiao Feng-Shou
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, 310007, China.
Chem Asian J. 2025 Jan 2;20(1):e202401057. doi: 10.1002/asia.202401057. Epub 2024 Nov 19.
Pure silica ITH zeolite is normally synthesized under neutral or acidic conditions in the presence of HF, but it is challenging for synthesis of this zeolite under alkaline conditions. In this work, it is successful for alkaline synthesis of pure silica ITH in the absence of HF using a designed organic template containing F species, showing that the sample obtained has high crystallinity associated with ITH structure, nanosheet morphology, and rich silanol nests. Very importantly, this ITH zeolite exhibited better performance in vapor phase Beckmann rearrangement of cyclohexanone oxime than that of Silicalite-1 zeolite, one of the best catalysts for this reaction. This work might offer a new opportunity for preparation of pure silica zeolites as efficient catalysts in the Beckmann rearrangement in the future.
纯硅ITH沸石通常在中性或酸性条件下、在HF存在的情况下合成，但在碱性条件下合成这种沸石具有挑战性。在这项工作中，使用含氟物种的设计有机模板在无HF的情况下成功实现了纯硅ITH的碱性合成，表明所得样品具有与ITH结构相关的高结晶度、纳米片形态和丰富的硅醇巢。非常重要的是，这种ITH沸石在环己酮肟的气固相贝克曼重排反应中表现出比Silicalite-1沸石更好的性能，Silicalite-1沸石是该反应中最好的催化剂之一。这项工作可能为未来制备作为贝克曼重排高效催化剂的纯硅沸石提供新的机会。
