Abstract

The stability of nanosized catalysts at high temperature is still a challenging topic and is a crucial criterion to evaluate their suitability for industrial use. Currently, the strategy to improve the high-temperature stability of nano-sized catalysts is to restrict the migration of particles on the surface, which, however, lacks theoretical knowledge and directions. Herein, we reported a new approach that can effectively inhibit the migration and agglomeration of supported nanoparticles by fabrication of a model catalyst Pt/CeO₂/NiAl₂O₄/Al₂O₃@SiO₂. This catalyst is highly stable with the microstructure unchanged even after being aged at 1000 °C. Density functional theory calculations indicate that two types of confinement effects exist in the catalyst and their mechanisms were well explained from the viewpoint of “energy traps” which can also be applied to other supported catalysts.

中文翻译：

---

具有“复合能阱”的耐烧结且高效的Pt / CeO 2 / NiAl 2 O 4 / Al 2 O 3 @SiO 2模型催化剂

摘要

纳米催化剂在高温下的稳定性仍然是一个具有挑战性的话题，并且是评估其在工业上的适用性的关键标准。当前，改善纳米尺寸催化剂的高温稳定性的策略是限制颗粒在表面上的迁移，然而，这缺乏理论知识和方向。本文中，我们报道了一种新方法，该方法可通过制造模型催化剂Pt / CeO ₂ / NiAl ₂ O ₄ / Al ₂ O ₃ @SiO ₂来有效抑制负载的纳米颗粒的迁移和团聚。该催化剂即使在1000°C老化后仍具有高度稳定的微观结构。密度泛函理论计算表明，催化剂中存在两种限制作用，并且从“能量陷阱”的角度对它们的作用机理进行了很好的解释，也可以将其应用于其他负载型催化剂。