Supported gold nanocluster catalyst as well as preparation method and application thereof
A gold nano-cluster, supported technology, applied in the field of supported gold nano-cluster catalysts and its preparation, can solve problems such as difficult to achieve catalytic activity, reaction conversion rate, unstable product selectivity, etc., achieve low equipment requirements, Good industrial application prospects, the effect of improving catalytic activity
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[0052] Example 1
[0053] This embodiment provides a method for preparing gold nanoclusters, which is specifically as follows:
[0054] (1) 20mM HAuCl 4 ·3H 2 O solution 0.25mL, 3-mercaptopropionic acid solution (MPA) 2mL, mixed in 2.35mL of ultrapure water to form a MPA-Au complex.
[0055] (2) Add 0.3mL of 1mol / L NaOH solution to the above solution, then add 0.1mL of the above NaBH 4 The solution was stirred magnetically for 3h, collected by centrifugation (8000rpm, 4min) to obtain Au 25 (MPA) 18 Nano clusters, namely Au 25 (MPA) 18 NCs.
[0056] Among them, NaBH 4 The solution is prepared by the following method: 43mg of NaBH 4 The powder is dissolved in 10mL of 0.2mol / L NaOH solution to get.
[0057] For the Au prepared above 25 (MPA) 18 NCs were characterized by UV-Vis, the results are as follows figure 1 Shown. by figure 1 It can be seen that Au 25 (MPA) 18 NCs has a triple absorption peak in the ultraviolet-visible region: (1) the absorption peak at 672nm is attributed to the L
Example Embodiment
[0059] Example 2 Nano CeO 2 Carrier preparation
[0060] Add 60mL of 7mol / L NaOH solution to 20mL of 0.25mol / L Ce(Ac) through a constant pressure funnel 3 In the solution, control the dropping rate to 3 seconds / drop, magnetically stir for 0.5h, transfer the solution to a hydrothermal kettle, hydrothermally at 180℃ for 24h, centrifuge to collect the solid, and then wash it with deionized water and absolute ethanol three times at intervals. Dry at 100°C for 24h, and grind thoroughly in a mortar to obtain a sample.
[0061] Using X-ray diffraction (XRD) to characterize the prepared samples, the results are as follows image 3 As shown, comparing it with the standard card (JCPDS#43-1002), the two are consistent, indicating that the prepared sample is pure CeO 2 . And perform SEM characterization on it, the results are as follows Figure 4 As shown in a, the rod-like structure (nano-rods) can be observed in the figure, and the prepared nano-rods have high yield, uniform size, good di
Example Embodiment
[0062] Example 3 Au 25 (MPA) 18 NCs / CeO 2 Preparation
[0063] Using the Au prepared in Example 1 25 (MPA) 18 The NCs powder is used as the active ingredient and loaded on the carrier. Wherein, the carrier is CeO prepared in Example 2 2 Nanorod powder.
[0064] 500mg CeO prepared in Example 2 2 Nanorod powder and 5mg of Au prepared in Example 1 25 (MPA) 18 Disperse NCs powder in 10mL of dichloromethane, seal and stir for 24h, stand still for layering, dry the bottom layer at 60℃ for 4h, and calcinate at 300℃ for 2h (heating rate 2℃ / min) to obtain Au 25 (MPA) 18 NCs / CeO 2 , The mass fraction of Au loaded is about 1%.
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