1. Defective Au nanoparticles manipulated by Au-MgxAl-LDH interplay for alkali-free oxidation of benzyl alcohol.
- Author
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Luo, Jingjie, Yang, Sihan, Ling, Yu, Yang, Wenhao, Niu, Hongyu, Li, Wenlong, Liu, Huibin, and Liang, Changhai
- Subjects
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BENZYL alcohol , *GOLD nanoparticles , *CHEMICAL properties , *ALCOHOL oxidation , *GOLD catalysts , *NANOPARTICLES , *HETEROGENEOUS catalysis - Abstract
[Display omitted] • Au configuration modulated by MgAl x -LDH via preferential-oriented (0 1 5) plane. • Defective Au centers with low-coordinated atoms formed via Au-LDH interplay. • Au-LDH interface with rich Au step sites changed electron and chemical properties. • Au/Mg 3.5 Al-LDH shows fast TOF of 1008 h−1 for alkali-free BnOH oxidation. Supported gold catalyst, especially in terms of nanosized particles with defective surface and low-coordinated structure, plays a vital role in the heterogeneous catalysis. However, such defective Au nanoparticles are hardly acquired when supporting on non-reducible metal oxides/hydroxides due to insufficient Au-support interaction. In this work, we found that the defective Au NPs could be fabricated via the strong interplay between Au and crystal lattices of layered double hydroxides-Mg x Al-LDH. Experimental and theoretical evidences revealed that the formation of a preferential-oriented LDH(0 1 5) plane enabled the surface configuration for defective Au centers with the maximized number of step sites at Mg/Al ratio of 3.0–3.5. The optimized Au/Mg 3.5 Al-LDH catalyst shows a boosting catalytic activity for benzyl alcohol oxidation (TOF, 1008 h−1) at only 80 °C with the lowest activation energy in the absence of alkali. The work provides a new insight for manipulating the defective-enriched Au particles via the fine-tuning Au-LDH interplay for alkali-free selective oxidations. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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