Citation: Toru Murayama, Masatake Haruta. Preparation of gold nanoparticles supported on Nb₂O₅ by deposition precipitation and deposition reduction methods and their catalytic activity for CO oxidation[J]. Chinese Journal of Catalysis, ;2016, 37(10): 1694-1701. doi: 10.1016/S1872-2067(16)62508-1 shu

Preparation of gold nanoparticles supported on Nb₂O₅ by deposition precipitation and deposition reduction methods and their catalytic activity for CO oxidation

Research Center for Gold Chemistry, Tokyo Metropolitan University, F203-1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan

Received Date: 19 May 2016
Revised Date: 30 June 2016

Nanoparticulate gold catalysts supported on niobium oxides (Nb₂O₅) were prepared by different deposition methods. The deposition precipitation (DP) method, DP method with urea, deposition reduction (DR) method and one-pot method were used to prepare a 1 wt% Au/Nb₂O₅ catalyst. Layered-type Nb₂O₅ synthesized by a hydrothermal method (Nb₂O₅(HT)) was the most suitable as a support among various types of Nb₂O₅ including commercially available Nb₂O₅ samples. It appeared that the large BET surface area of Nb₂O₅(HT) enabled the dispersion of gold as nanoparticles (NPs). Gold NPs with a mean diameter of about 5 nm were deposited by both the DP method and DR method on Nb₂O₅(HT) under an optimized condition. The temperature for 50% CO conversion for Au/Nb₂O₅(HT) prepared by the DR method was 73℃. Without deposition of gold, Nb₂O₅(HT) showed no catalytic activity for CO oxidation even at 250℃. Therefore, the enhancement of the activity by deposition of gold was remarkable. This simple Au/Nb₂O₅ catalyst will expand the types of gold catalysts to acidic supports, giving rise to new applications.
- Gold nanoparticulate,
- Niobium oxide,
- Solid acid,
- CO oxidation,
- Heterogeneous catalyst
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Preparation of gold nanoparticles supported on Nb₂O₅ by deposition precipitation and deposition reduction methods and their catalytic activity for CO oxidation