Nanocluster arrays grown on a graphene Moiré on Rh(111) are an excellent model system that can bridge the materials gap between single crystals and real catalysts. They feature different adsorption sites like edges, kinks, and facets, but are at the same time well-ordered with a small size distribution. Herein, we used platinum nanocluster arrays to investigate the oxidation of sulfur, which is a common catalyst poison, as a possible route to restore the catalyst. We studied the kinetics in a site-resolved manner with high-resolution XPS, despite the complex shape of the nanoparticles. Since SO₃ and SO₄ were the only observable SO_x surface species, the reaction of S to SO was identified as the rate-determining step. As a secondary process, the displacement of sulfur from edge to facet sites caused by oxygen was observed.

生长在Rh（111）上的石墨烯莫尔条纹上的纳米簇阵列是一种出色的模型系统，可以弥合单晶与实际催化剂之间的材料缺口。它们具有不同的吸附位置，如边缘，扭结和小平面，但同时排列整齐，尺寸分布较小。在本文中，我们使用铂纳米簇阵列研究了硫的氧化，这是一种常见的催化剂毒物，是还原催化剂的可能途径。尽管纳米粒子的形状复杂，但我们还是采用高分辨率XPS以定点分析的方式研究了动力学。由于SO ₃和SO ₄是唯一可观察到的SO _x在表面物种中，S与SO的反应被确定为决定速率的步骤。作为第二过程，观察到了由氧气引起的硫从边缘到小面的置换。