Boosting CO hydrogenation towards C<sub>2+</sub> hydrocarbons over interfacial TiO<sub>2-x</sub>/Ni catalysts.

Xu, Ming; Qin, Xuetao; Xu, Yao; Zhang, Xiaochen; Zheng, Lirong; Liu, Jin-Xun; Wang, Meng; Liu, Xi et al. · Nat Commun · 2022

basic_science · Level V

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Abstract

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 TiO2-x/Ni catalysts, where disordered TiO2-x overlayers immobilized onto the surface of Ni nanoparticles (~20 nm) are successfully engineered with SMSI effect. The optimal TiO2-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 Niδ-/TiO2-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.