Zeolites doped with metal nanoparticles have shown the outstanding activity in many processes involving heterogeneous catalysis. The size of metal nanoparticles plays a decisive role in the performance of zeolite catalysts. However, the precise control of the size of nanoparticles is still limited. Herein, we present the synthesis of Pt-MWW zeolites with controllable nanoparticle size using a series of surfactants with different alkyl chain lengths for swelling of layered MCM-22 P. The interlayer distances of swollen materials increases with the length of the surfactant from 1.06 nm (C₁₂OH) to 2.89 nm (C₁₈OH). During swelling, the Pt nanoparticles were intercalated to the interlayer space of MCM-22 P. Further calcination resulted in Pt-MWW materials showing similar morphologies, textural properties and Pt content despite the differences in the initial interlayer distances. The factor that differentiated the synthesized materials was the average diameter of metal nanoparticles. As a result, the average size of Pt nanoparticles increased from 0.85 nm (MCM-22-C₁₂OH-Pt) to 2.04 nm (MCM-22-C₁₈OH-Pt) which is related to the length of the hydrocarbon chain of the surfactant used for the swelling process.

掺杂有金属纳米颗粒的沸石在涉及多相催化的许多过程中显示出杰出的活性。金属纳米粒子的大小在沸石催化剂的性能中起决定性作用。然而，对纳米颗粒尺寸的精确控制仍然受到限制。在这里，我们提出了使用一系列具有不同烷基链长度的表面活性剂，用于层状MCM-22 P溶胀的纳米颗粒尺寸可控制的Pt-MWW沸石的合成。溶胀材料的层间距离随着表面活性剂的长度从1.06 nm起而增加（C ₁₂ OH）至2.89 nm（C ₁₈哦）。在溶胀过程中，Pt纳米颗粒插入了MCM-22 P的层间空间。进一步的煅烧导致Pt-MWW材料显示出相似的形貌，组织性质和Pt含量，尽管初始层间距离有所不同。区分合成材料的因素是金属纳米粒子的平均直径。结果，Pt纳米粒子的平均尺寸从0.85 nm（MCM-22-C ₁₂ OH-Pt）增加到2.04 nm（MCM-22-C ₁₈ OH-Pt），这与碳氢化合物的碳链长度有关。用于溶胀过程的表面活性剂。