Preparation of TiO₂-supported twinned gold nanoparticles by CO treatment and their CO oxidation activity

Abstract

We found that twinned gold nanoparticles (T-AuNPs) are generated at a high probability by CO treatment of TiO2-supported Au(iii) at room temperature. Because of the formation of T-AuNPs, the Au/TiO2 prepared by the CO treatment showed higher catalytic activity for CO oxidation than Au/TiO2 prepared by conventional H2 treatment.

Data Driven Determination of Reaction Conditions in Oxidative Coupling of Methane via Machine Learning

“…Hence, gold catalysts under the guideline of particle size control can be well designed. Previous studies have also suggested, however, that factors other than particle size such as support effect, cluster size or single atom effect, and crystal structure also greatly contribute to the performance of gold catalysts . In other words, the effect of the catalyst structure is a multi‐dimensional problem.…”

“…Previous studies have also suggested, however, that factors other than particle size such as support effect, cluster size or single atom effect, and crystal structure also greatly contribute to the performance of gold catalysts. [17][18][19] In other words, the effect of the catalyst structure is a multi-dimensional problem. If such multi-dimensional problem can be treated within machine learning, further sophisticated catalyst design can be made achievable in principle.…”

A Theoretical Insight into Enhanced Catalytic Activity of Au by Multiple Twin Nanoparticles

“…They suggested that the exceptional activity of gold nanoparticles for the low-temperature CO oxidation arose from the presence of highly-uncoordinated atoms. Twinning of Au NPs shows higher activity for the CO oxidation reaction than single crystal Au NPs [9,14,15]. The morphology effect by twinning was shown to be independent of the size effect.…”

“…For twin NPs, two types of structures are adopted; one is a single twin structure, which has a single grain boundary, and the other is a multiple twin type, which has five-fold twinning. Both types of twin NPs were experimentally observed [13,14]. The single-twin NP has the symmetry of D 3h (hereafter, referred to as "D 3h -NP").…”

“…The morphology effect by twinning was shown to be independent of the size effect. Even though Au NPs with the same particle distribution were synthesized, twin NPs were more active for CO oxidation than single-crystal NPs [14]. Determining the reason why twin NPs are more active will give us a deeper understanding for the design of Au NP catalyst.…”