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

Inactive Publication Date: 2018-09-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the traditional scheme, the TiO 2 , CeO 2 , Fe 2 o 3 , SiO 2 As a carrier, the gold-loaded catalyst prepared by loading nano-gold particles is

Method used

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  • Supported gold nanocluster catalyst as well as preparation method and application thereof
  • Supported gold nanocluster catalyst as well as preparation method and application thereof
  • Supported gold nanocluster catalyst as well as preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[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 LU...

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 dispe...

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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Abstract

The invention provides a supported gold nanocluster catalyst. The catalyst is prepared from an active component and a carrier, wherein the active component is gold nanoclusters, and the carrier is a CeO2 nanorod. By means of the extensive creative work of the inventor, the nano-gold clusters with ultra-small sizes are supported by the CeO2 nanorod; when being used as the carrier, the CeO2 nanorodcan stabilize the gold nanoclusters and provide oxygen vacancies, thus solving the problems that the gold nanoclusters have higher surface energy and are not stable; due to the synergistic effect thenanorod and the gold nanoclusters, the nanorod exposes the more active crystal plane of the CeO2 carrier, an oxygen species with higher activity is formed, and the catalytic activity of the supportedgold nanocluster catalyst is improved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a supported gold nano-cluster catalyst and its preparation method and application. Background technique [0002] Support plays a very important role in supported gold catalysts. TiO 2 , CeO 2 , Fe 2 o 3 , SiO 2 etc. are commonly used supports in gold-supported catalysts. Among them, cerium oxide (Cerium Oxide, CeO 2 ) is the most stable oxide of cerium, and it is also an important functional rare earth metal oxide. CeO 2 The molecular weight is 172.11, and the density is 7.215g / cm 3 , It is light yellow powder with loose structure at room temperature, non-toxic and odorless, insoluble in water and alkali, slightly soluble in acid, melting point up to 2600 ° C, boiling point up to 3500 ° C, with strong redox. CeO 2 It is considered as a suitable carrier due to its unique crystal structure, rapid oxygen storage and release capacity, and strong redox ability. [0003] nano-CeO ...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01J35/02C07C45/28C07C47/54C07C49/78C07D301/19C07D303/04
CPCB01J23/66B01J35/006B01J35/02C07C45/28C07D301/19C07D303/04C07C47/54C07C49/78
Inventor 郑育英张健方岩雄姬文晋窦正杰刘全兵党岱
Owner GUANGDONG UNIV OF TECH
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