Load type nano-au catalyst and the preparing method

A catalyst, supported technology, applied in catalyst carrier, oxidation reaction preparation, carbon-based compound preparation, etc., can solve the problems of high reaction temperature, pipeline blockage, short catalyst life, etc., achieve low peroxide content, easy to recycle , the effect of high ketone alcohol selectivity

Inactive Publication Date: 2008-11-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalytic method of soluble cobalt salt or manganese salt has the disadvantages of difficult separation of catalyst and product and more coking, which is easy to cause pipeline blockage
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 catalyst is used for the oxidation of cyclohexane, it has the advantages of no need for reaction solvent and easy recycling, but the reaction temperature is high, and the activity and selectivity of the catalyst are low.

Method used

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  • Load type nano-au catalyst and the preparing method
  • Load type nano-au catalyst and the preparing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) 8.7 grams of Al 2 o 3 Containing 0.58 g Ce(NO 3 ) 3 ·6H 2 O and 0.14 g Zr(NO 3 ) 4 ·5H 2 Immerse an equal volume of O in an aqueous solution at room temperature for 12 hours. After the impregnation is completed, dry at 60°C for 2 hours, and calcinate at 300°C for 1 hour to obtain a catalyst carrier;

[0019] 2) The obtained catalyst support was added to a mixture containing 0.02 gram of HAuCl 4 4H 2 In 500 ml of aqueous solution of O, adjust the pH value to 4.0 with NaOH solution, stir and impregnate at 30 ° C for 1 h; filter or centrifuge the solid product obtained by washing with 30 ml of 1M ammonia water, then wash with water until neutral, and dry at 60 ° C for 2 h , and calcined at 300° C. for 1 h to obtain catalyst 1 .

Embodiment 2

[0021] 1) 8.7 g of SiO 2 Containing 19.8 grams of Ce (NO 3 ) 3 ·6H 2 O and 14.8 g Zr(NO 3 ) 4 ·5H 2 The aqueous solution of O was impregnated in equal volume at room temperature for 24 hours. After the impregnation was completed, it was dried at 200°C for 6 hours and calcined at 700°C for 6 hours to obtain a catalyst carrier;

[0022] 2) The obtained catalyst support was added to a mixture containing 1.05 g of HAuCl 4 4H 2 In 500 ml of aqueous solution of O, adjust the pH value to 6.0 with NaOH solution, stir and impregnate at 90 ° C for 2 h; filter or centrifuge the solid product obtained by washing with 100 ml of 4M ammonia water, then wash with water until neutral, and dry at 200 ° C for 6 h , Calcined at 700°C for 6h to obtain catalyst 2.

Embodiment 3

[0024] 1) 8.7 grams of Al 2 o 3 Containing 0.6 g Ce(NO 3 ) 3 ·6H 2 O and 0.8 g Zr(NO 3 ) 4 ·5H 2 The aqueous solution of O was impregnated with equal volume at room temperature for 12 hours, after the impregnation was completed, dried at 80°C for 4h, and calcined at 400°C for 6h to obtain the catalyst carrier;

[0025] 2) The obtained catalyst carrier was added to a mixture containing 0.1 gram of HAuCl 4 4H 2 O in 500 ml of aqueous solution, the pH value was adjusted to 4.0 with NaOH solution. The obtained catalyst carrier was added to the above solution, stirred and reacted at 60°C for 2h, filtered, and the solid product was washed with 30ml of 1M ammonia water until neutral, dried at 80°C for 4h, and calcined at 600°C for 1h to obtain Catalyst 3.

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Abstract

The present invention discloses a supported gold nano-particles catalyst and the preparation method of the same, which comprises Au, Ce, Zr, Al and Si; wherein Au is the main active component and has a mass percent of 0.1~4.0%; Ce and Zr are the assistant active component and has a mass percent of 3~57%, wherein the mol ratio of Ce to Zr is 1~10; Al and Si are the carrier and has a mass percent of 40~97%. The catalyst is prepared by a sequential immersion method, wherein the alumina or silicon oxide carrier is firstly impregnated by an aqueous liquid containing cerous nitrate and zirconium nitrate and then the gold component is impregnated. The present invention has the advantages of that: the preparation method is simple, the stability is excellent and the cost is low. For the reaction of preparing cyclohexanone and cyclohexanol by cyclohexane oxygenation, the catalyst of the present invention can obtain high ketone alcohol selectivity even under the condition of a high conversion, besides the peroxide content in the product is very low. For example, when the conversion of cyclohexane is 12.8%, the ketone alcohol selectivity is up to 92.6% and the peroxide content is only 0.7%.

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. The catalyst obtained by the co-precipitation method has a low utilization rate of gold because part of the gold is wrapped by the carrier. The deposition precipitation method is generally suitable for supports with an isoelectric point of pH ≥ 6, and the catalysts prepared by these two methods sti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J32/00C07C45/33C07C29/50
Inventor 许立信朱明乔何潮洪梁燕
Owner ZHEJIANG UNIV
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