Application of supported gold cluster catalyst

A catalyst and atomic cluster technology is applied in the application field of supported gold atomic cluster catalysts to achieve the effects of mild reaction conditions, controllable particle size and low price

Active Publication Date: 2016-10-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application of supported gold cluster catalysts in the selective hydrogenation o

Method used

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  • Application of supported gold cluster catalyst
  • Application of supported gold cluster catalyst
  • Application of supported gold cluster catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of precursors containing Au atomic clusters

[0023] Prepare chloroauric acid solution, cysteine ​​(abbreviated as Cys) solution, 1M NaOH solution and NaBH in advance 4 solution. Wash and dry the 1000mL round bottom flask, and add magnets. Add 5.00mL HAuCl to it 4 Solution (19.12g Au / L), 200mL ultrapure and 150mL Cys solution, it was observed that the color of the solution changed from light yellow to dark yellow and finally became milky white. Then measure 30mL of 1M NaOH solution and quickly add it into the flask, and the solution immediately becomes clear and transparent. Freshly prepared NaBH was then 4 (0.2M NaOH) solution 10mL is added in the flask again, and the solution turns brownish red, and at room temperature, stirred at 1000rpm for 3h, the color of the solution gradually deepens and finally turns brownish black. In the above process, mercapto, NaOH, NaBH 4 The molar ratios to Au are 1.5, 30, 5, respectively). The obtained product was cent...

Embodiment 2

[0025] Compared with Example 1, the difference is that the cysteine ​​solution is replaced by glutathione solution or homocysteine ​​solution, and the amount of other materials and operating conditions are the same as in Example 1.

Embodiment 3

[0027] Preparation of hydrotalcite carrier

[0028] Take Zn(NO 3 ) 2 .6H 2 O(or Mg(NO 3 ) 2 .6H 2 O, or Ni(NO 3 ) 2 .6H 2 O, or Co(NO 3 ) 2 .6H 2 O) 0.21mol, Al(NO 3 ) 3 9H 2 Add 0.07mol of O into a 1000mL beaker, then add 200mL of deionized water and stir to dissolve to form A solution. Take NaOH 0.438mol, Na 2 CO 3 Add 0.113mol into another 500mL beaker, add 200mL deionized water and stir to dissolve to form B solution. Under stirring in a water bath at 70°C, slowly drop the A solution into the B solution with a constant flow pump, and then stir and age at this temperature for 18 hours. The resulting suspension was filtered and washed with a large amount of deionized water, and finally dried in an oven at 60°C overnight. Grind the dried sample with an agate mortar and sieve the powder with a mesh size of less than 180 mesh, bottle it and store it in a desiccator. Other hydrotalcite supports with different proportions were prepared by controlling the amount...

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Abstract

The invention relates to application of a supported gold cluster catalyst to selective hydrogenation of an aromatic nitrocompound. A preparation method for the catalyst comprises the following steps: with a biological reagent containing mercaptan as a protective agent, preparing a precursor containing a gold cluster in advance; then impregnating a carrier with the precursor; and carrying out drying and roasting at a certain temperature so as to obtain the catalyst which can be directly applied to selective hydrogenation of the aromatic nitrocompound. The catalyst shows excellent activity and selectivity under mild reaction conditions; and compared with supported gold catalysts prepared by using a coprecipitation or deposition-precipitation method, the catalyst prepared in the invention is substantially advantaged in activity and selectivity.

Description

technical field [0001] The invention relates to the preparation of a supported gold atom cluster catalyst and its application to the selective hydrogenation of aromatic nitro compounds to generate corresponding aromatic amines. Background technique [0002] The selective hydrogenation of aromatic nitro compounds is an important reaction in fine chemical industry, especially for aromatic nitro compounds containing unsaturated double bond or triple bond functional groups, the selective hydrogenation of aromatic nitro compounds to generate corresponding aromatic amines is of great significance. At present, the relatively mature method in the industry is to use a metered reducing agent to reduce the raw material, but because such a reducing agent will inevitably generate other wastes while obtaining the target product, thus increasing the complexity of the subsequent treatment process , so this method is not economical and environmentally friendly. [0003] At present, a large ...

Claims

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Application Information

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IPC IPC(8): C07B43/04C07C211/45C07C209/36C07C223/06C07C221/00C07C225/22C07C255/58C07C253/30B01J23/66B01J23/89
Inventor 刘晓艳谭媛王爱琴张涛张磊磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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