Journal
MOLECULES
Volume 18, Issue 10, Pages 12609-12620Publisher
MDPI
DOI: 10.3390/molecules181012609
Keywords
gold catalysts; alumina; p-nitrophenol; nanoparticles; size effect
Funding
- National Natural Science Foundation [11375091]
- Natural Science Foundation of Ningbo [2011A610171]
- China Zhejiang Provincial Natural Science Foundation [Y4110116]
- Ministry of Science and Technology of China [2012DFA40550]
- National Natural Science Foundation of China [21007011, 21177028]
- Ph.D. Programs Foundation of the Ministry of Education in China [20100071120012]
- Overseas Returnees Start-Up Research Fund of the Ministry of Education in China
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Gold nanoparticles (Au NPs) were prepared by reducing HAuCl4 with NaBH4. Their average particle sizes could be tuned in the range of 1.7 and 8.2 nm, by adjusting the amount of NaBH4 used during synthesis. The obtained Au NPs (colloids) were then loaded onto a commercial Al2O3 support to prepare Au/Al2O3 catalysts with tunable Au particle sizes. An optimal pH value (5.9) of the Au colloid solution was found to be essential for loading Au NPs onto Al2O3 while avoiding the growth of Au NPs. Au NPs and Au/Al2O3 catalysts were tested in the reduction of p-nitrophenol with NaBH4. Interestingly, the catalytic activity depended on the size of Au NPs, being the highest when the average size was 3.4 nm. Relevant characterization by UV-Vis, TEM, and XRD was conducted.
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