Micrometer-sized TS-1-L zeolite was synthesized in an ultralow molar ratio of TPAOH/SiO₂ (0.05) using an aerosol-assisted hydrothermal synthesis method, and Au nanoparticles were deposited on the TS-1 zeolites to prepare the Au/TS-1-L catalyst for the direct epoxidation of propylene with H₂ and O₂. Interestingly, the micrometer-sized Au/TS-1-L exhibits better catalytic activity than the small-crystal Au/TS-1-S. The mass transfer capabilities of Au/TS-1-L and Au/TS-1-S do not show an obvious difference, because the formation of the hollow void structure may reduce the diffusion path of TS-1-L. Moreover, the higher amount of Ti³⁺ sites on TS-1-L, which can effectively promote the generation of the active Ti-OOH intermediate, is beneficial for catalytic performance. The easily separated micrometer-sized TS-1 may provide a potential application in low-temperature (160 °C) selective oxidation reactions.

中文翻译：

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低浓度模板制备微米级 Au/TS-1 作为 H2 和 O2 气相丙烯环氧化的高效催化剂


采用气溶胶辅助水热合成法，以超低摩尔比TPAOH/SiO ₂ （0.05）合成微米级TS-1-L沸石，并将Au纳米颗粒沉积在TS-1沸石上制备用于丙烯与H ₂ 和O ₂ 直接环氧化的Au/TS-1-L催化剂。有趣的是，微米尺寸的Au/TS-1-L比小晶体Au/TS-1-S表现出更好的催化活性。 Au/TS-1-L和Au/TS-1-S的传质能力没有表现出明显的差异，因为中空结构的形成可能会减少TS-1-L的扩散路径。此外，TS-1-L上较多的Ti ³⁺ 位点可以有效促进活性Ti-OOH中间体的生成，有利于催化性能。易于分离的微米级TS-1可能在低温（160℃）选择性氧化反应中提供潜在的应用。