Synergistic effects of Pt single atomic site and Cu nanoclusters for catalytic oxidation of methyl mercaptan
Yiming Ma, Dongjuan Kang, Yanfeng Wen, Yimeng Chen, Yuhan Long, Honghong Yi, Xiaolong Tang, Shunzheng Zhao
Abstract
Here, we report a catalyst design strategy, which uses hydrotalcite as a precursor to obtaining uniformly loaded nano copper clusters and further load single atom Pt to form a synergistic catalytic effect between precious metals and transition metals and is applied to the catalytic oxidation of CH 3 SH. The ability of adsorption-activation of molecular oxygen can be enhanced by constructing copper nanoclusters on the surface of metal oxides, and the catalytic oxidation path of methanethiol can be changed from MVK scheme to ER scheme. However, it is still not enough to obtain the ideal methanethiol conversion efficiency. Inspired by the organometallic chemistry of platinum, the element sulfur has a good bonding ability with platinum. We introduced platinum single atoms onto copper nanoclusters. Confirmation of atomically dispersed Pt by spherical aberration corrected electron microscopy and XAFS. Combined with the above characterization and calculation, it can be seen that the introduction of single-atom Pt is conducive to the adsorption of CH 3 SH, Cu nanoclusters can activate oxygen molecules, and the synergistic effect of the two active sites can significantly improve the catalytic oxidation activity of the catalyst for CH 3 SH. The oxidation of CH 3 SH occur via the Langmuir-Hinshelwood scheme (L-H scheme).