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Supported nano Au catalyst and method for preparing the same

A catalyst and nano-gold technology, which is applied in the field of supported nano-gold catalyst and its preparation, can solve the problems of short catalyst life, low conversion rate, and difficult recovery, and achieve the effect of small catalyst consumption, easy recycling, and uniform dispersion

Inactive Publication Date: 2006-09-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cobalt salt catalytic method also has the disadvantages of low conversion rate and poor selectivity
The biomimetic catalytic method disclosed in Chinese patents CN 00113225.3 and CN 1405131A has the advantages of relatively mild reaction conditions and high selectivity, but there are problems such as short catalyst life and difficult recovery
Although the above-mentioned supported gold catalysts have the advantage of not requiring reaction solvents and other additives for the oxidation of cyclohexane, the reaction temperature is generally around 170 ° C. It is still a challenge to obtain high conversion and selectivity under such high temperature and high pressure conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of Catalyst A. Take 0.03g chloroauric acid HAuCl 4 4H 2 O was dissolved in 100 mL of deionized water, and the pH value was adjusted to 5.0 with 1 M sodium hydroxide solution. Add 1.0 g Al to the above solution 2 o 3 , stirred and reacted at 70°C for 2h, filtered, and the solid product was washed with 30mL of 1M ammonia water, dried at 80°C for 4h, then impregnated with 2mL of a solution containing 0.008g of silver nitrate at room temperature for 10h, and dried at 80°C for 4h. The obtained solid product was added to a mixture containing 0.55 mL tetraethyl orthosilicate, 10 mL benzene, and 10 mL ethanol, stirred and reacted for 2 h at room temperature, filtered, washed with 30 mL ethanol, and then washed with 50 mL deionized water, at 80°C Drying for 4 hours and calcining at 400°C for 4 hours gave Catalyst A, whose composition is shown in Table 1.

Embodiment 2

[0023] Preparation of Catalyst B. Take 0.02g chloroauric acid HAuCl 4 4H 2 O was dissolved in 100 mL deionized water, and the pH value was adjusted to 6.0 with 1 M sodium hydroxide solution. Add 1.0 g Al to the above solution 2 o 3 , stirred at 90°C for 2h, filtered, washed the solid product with 30mL of 4M ammonia water, and dried at 200°C for 4h. This solid product contains 0.02g nitrate Cu(NO) with 2mL 3 ) 2 ·6H 2 The aqueous solution of O was soaked at room temperature for 10 h, dried at 200 °C for 4 h, and roasted at 500 °C for 4 h. The obtained solid product was added to a mixture containing 1.6 mL of butyl titanate, 10 mL of toluene, and 10 mL of methanol, stirred at room temperature for 2 h, filtered , washed with 60 mL of ethanol, then washed with 100 mL of deionized water, dried at 200°C for 4 hours, and calcined at 500°C for 4 hours to obtain catalyst B, whose composition is shown in Table 1.

Embodiment 3

[0025] Preparation of Catalyst C. Take 0.02g chloroauric acid HAuCl 4 4H 2 O was dissolved in 100 mL deionized water, and the pH value was adjusted to 3.0 with 1 M sodium hydroxide solution. Add 1.0 g Al to the above solution 2 o 3 , stirred at 20°C for 8h, filtered, washed the solid product with 30mL of 1M ammonia water, and dried at 60°C for 8h. This solid product contains 0.01g cerium nitrate Ce (NO 3 ) 3 ·6H 2 The aqueous solution of O was soaked at room temperature for 20 hours, dried at 60°C for 8 hours, and roasted at 200°C for 8 hours. The obtained solid product was added to a mixture containing 2.2 mL of tetraethylorthosilicate, 10 mL of toluene, and 10 mL of ethanol, and stirred at room temperature for 8 hours. Filter, wash with 30 mL of ethanol, then wash with 50 mL of deionized water, dry at 60°C for 8 hours, and calcined at 200°C for 8 hours to obtain Catalyst C, whose composition is shown in Table 1.

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Abstract

The invention discloses a carrier nanometer gold catalyst gold catalyst and relative preparing method. Said invention is formed by Au, Al, and Ti / Si, Ag, Cu, Ce, Fe, or Zn. Wherein, Au is the main active component of catalyst, whose mass percentage is 0.1-4.0%; Al is the carrier of catalyst, whose mass percentage is larger than 90%; Ti or Si is the agent of catalyst carrier, whose mass percentage is 0.01-1.0%; Ag, Cu, Ce, Fe, or Zn is used as the auxiliary active component of catalyst, whose mass percentage is 0.1-5.0%. The invention has the advantages that: the gold is distributed uniformly, and the graininess of attained gold particle can be adjusted easily; the catalyst has high stability; and it can apply the oxide carrier for carrying gold whose isoelectric point pH is less than 6 and made by coprecipitation method. The invention has be used to apply the cyclohexane to prepare the nadone and cyclohexanol, with better activity and selectivity, less used amount and recycle support.

Description

technical field [0001] The invention relates to a supported nano-gold catalyst for preparing cyclohexanone and cyclohexanol by cyclohexane oxidation and a preparation method thereof. Background technique [0002] Nano-gold catalysts have excellent low-temperature catalytic oxidation activity, which is one of the major discoveries in the field of catalysis in recent years. Gold catalysts have been found in CO and NO x Elimination of hydrocarbons, oxidation of hydrocarbons, water vapor shift, fuel cells and other fields have good application prospects. The common preparation methods of nano-gold catalysts include co-precipitation method, deposition precipitation method and so on. In the catalyst obtained by the co-precipitation method, part of the gold is wrapped by the carrier, which cannot play a catalytic role, and the utilization rate of gold is low. The deposition precipitation method is only suitable for supports with an isoelectric point of pH ≥ 6, and the catalysts ...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J32/00B01J37/00C07C27/10C07C49/403C07C35/08
Inventor 许立信朱明乔何潮洪
Owner ZHEJIANG UNIV
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