Strong Metal–Support Interaction of Ru on TiO2 Derived from the Co-Reduction Mechanism of RuxTi1–xO2 Interphase

Yaru Zhang,Yanqiang Huang,Yang Su,Wenjie Yan,Xiaoyan Liu,Xiaofeng Yang,Haifeng Qi,Xiong Su,Lin Li,Tao Zhang

doi:10.1021/acscatal.1c04785

Abstract

Strong Metal–Support Interaction of Ru on TiO2 Derived from the Co-Reduction Mechanism of RuxTi1–xO2 Interphase

Highlights

The pre-existing metal nanoparticles on the supports was suggested during the processes of SMSI, on which the subsequent migration of supports occurs over metal nanoparticles in a reduction condition which is regarded as the classical formation mechanism of SMSI
The resulting samples after calcination and a chlorides removal process are denoted as Ru/TiO2-xAir, where x indicates the intended calcination temperature (200, 300, 400, or 500°C)
The X-ray diffraction (XRD) patterns of the Ru/TiO2-xAir samples do not show any diffraction associated with Ru or RuO2 species (Figure S1), suggesting the high dispersion of Ru species on the rutile TiO2 after calcination, which is further confirmed by the highly dispersed Ru/Ti/O in the elemental mapping results (Figure S2)

Summary

Introduction

The strong metal–support interaction (SMSI) was first discovered by Tauster et al to describe the phenomenon that reducible oxides supported group VIII noble metals suffer a significant suppression of CO and H2 chemisorption after high-temperature reduction treatment.[1, 2, 3, 4] Generally, the pre-existing metal nanoparticles on the supports was suggested during the processes of SMSI, on which the subsequent migration of supports occurs over metal nanoparticles in a reduction condition which is regarded as the classical formation mechanism of SMSI. Due to the chemical interactions of metal oxide with the supports which is oxide in many cases, the formation of solid solution of oxide interphase would encounter during the pretreatment of precursors in the practical synthesis of metals on the supports, which makes the stepwise reduction of metal oxides to metallic nanoparticles on support a challenge. In this case, the mechanism of SMSI generation would differ from the classical SMSI. The researches have demonstrated that the migration of support components is greatly sensitive to the contact interface between metal and support in an SMSI system,[12, 13] while a mechanistic understanding for the role of reduction mechanism in this state of SMSI formation is still lacking

Methods

Results

Conclusion