Considerable attention has been drawn to tune the geometric and electronic structure of interfacial catalysts via modulating strong metal-support interactions (SMSI). Herein, we report the construction of a series of TiO_2−x/Ni catalysts, where disordered TiO_2−x overlayers immobilized onto the surface of Ni nanoparticles (~20 nm) are successfully engineered with SMSI effect. The optimal TiO_2−x/Ni catalyst shows a CO conversion of ~19.8% in Fischer–Tropsch synthesis (FTS) process under atmospheric pressure at 220 °C. More importantly, ~64.6% of the product is C₂₊ paraffins, which is in sharp contrast to the result of the conventional Ni catalyst with the main product being methane. A combination study of advanced electron microscopy, multiple in-situ spectroscopic characterizations, and density functional theory calculations indicates the presence of Ni^δ−/TiO_2−x interfacial sites, which could bind carbon atom strongly, inhibit methane formation and facilitate the C-C chain propagation, lead to the production of C₂₊ hydrocarbon on Ni surface.

通过调节强金属-载体相互作用 (SMSI)来调整界面催化剂的几何和电子结构引起了相当大的关注。在此，我们报告了一系列 TiO _{2- x} /Ni 催化剂的构建，其中固定在 Ni 纳米颗粒（~20 nm）表面的无序 TiO _{2- x覆盖层成功地设计为具有 SMSI 效应。}最佳 TiO _{2− x} /Ni 催化剂在 220 °C 大气压下费-托合成 (FTS) 过程中的 CO 转化率约为 19.8% 。更重要的是，约 64.6% 的产品是 C ₂₊链烷烃，这与传统 Ni 催化剂的主要产物是甲烷的结果形成鲜明对比。先进的电子显微镜、多个原位光谱表征和密度泛函理论计算的组合研究表明 Ni ^δ− /TiO _{2− x}界面位点的存在，它可以强烈地结合碳原子，抑制甲烷形成并促进 CC 链传播，导致 Ni 表面产生 C ₂₊烃。