Anchoring active metal particles in zeolite cages can significantly improve catalytic stability. In this study, hollow silicalite-1 (HoS-1) encapsulated Ni nanoparticles catalyst (Ni@HoS-1) was prepared using the impregnation method and applied in MA hydrogenation. The encapsulation mechanism was explained as the zeolite wall restricting the evaporation of water in HoS-1, hence Ni particles would be spontaneously enriched within the zeolite cage after drying and calcination. Experiments revealed the specially designed structure effectively protected Ni particles from leaching, and after 5 cycles in liquid-phase batch reactions, the final MA conversion of Ni@HoS-1 is 40.8 % higher than that of Ni/S-1 (85.5 % vs 44.7 %). Moreover, the low acidity of Ni@HoS-1 also delayed the accumulation of carbon deposits, extending the continuous reaction lifespan from 128 h of Ni/S-1 to 188 h. These findings provided a new perspective for the controllable locating of active metal sites against the supports.

中文翻译：

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空心硅酸盐-1 封装的镍纳米颗粒作为马来酸酐加氢反应中的高度稳定催化剂


将活性金属颗粒锚定在沸石笼中可以显着提高催化稳定性。在本研究中，采用浸渍法制备了空心硅石-1 （HoS-1） 封装的 Ni 纳米颗粒催化剂 （Ni@HoS-1），并应用于 MA 加氢。封装机制被解释为沸石壁限制了 HoS-1 中水分的蒸发，因此 Ni 颗粒在干燥和煅烧后会自发地富集在沸石笼内。实验表明，特殊设计的结构有效地保护了 Ni 颗粒免受浸出，在液相反歇反应中循环 5 次后，Ni@HoS-1 的最终 MA 转化率比 Ni/S-1 高 40.8 %（85.5 % 对 44.7 %）。此外，Ni@HoS-1 的低酸度也延迟了碳沉积物的积累，将 Ni/S-1 的连续反应寿命从 128 h 延长到 188 h。这些发现为活性金属位点相对于支撑物的可控定位提供了新的视角。