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Supported nano gold catalyst for cyclohexane oxidation and preparation method thereof

A catalyst and a supported technology, applied in the field of supported nano-gold catalysts and their preparation, can solve the problems that the performance of the nano-gold catalyst needs to be improved, the activity of the nano-gold catalyst is reduced, and the industrial production is unfavorable, and the catalyst dosage is small, the activity and the selection are achieved. The effect of good performance and high load efficiency

Inactive Publication Date: 2010-09-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN 1827213A uses a post-modification method to prepare a supported nano-gold catalyst. The disadvantage is that the high-temperature roasting in the post-modification process easily causes the nano-gold to aggregate and grow, thereby reducing the activity of the nano-gold catalyst, and the use of benzene and toluene and other toxic organic substances as solvents
In summary, the performance of nano-gold catalysts for cyclohexane oxidation needs to be improved
In addition, due to the many steps of the preparation method, the preparation cost is high, which is not conducive to industrial production

Method used

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  • Supported nano gold catalyst for cyclohexane oxidation and preparation method thereof
  • Supported nano gold catalyst for cyclohexane oxidation and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Preparation of Catalyst A. Take 0.04g chloroauric acid (HAuCl 4 4H 2 O) Dissolve in 100mL deionized water, add 2.00g γ-alumina (γ-Al 2 o 3 ) carrier, stirred and impregnated for 1 h at room temperature, poured off the supernatant, washed the obtained solid twice with deionized water, then soaked with 15 mL of 4M ammonia water for 5 min, filtered, and finally washed twice with deionized water to obtain The solid was dried at 80°C for 10 hours, and then calcined at 300°C for 3 hours to obtain catalyst A, whose composition is shown in Table 1.

Embodiment 2

[0019] Preparation of Catalyst B. 2.50g of γ-alumina (γ-Al 2 o 3 ) with 15mL containing 0.09g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) aqueous solution at room temperature for 1 hour, then rotary evaporated at 60°C to dryness, dried at 110°C for 2 hours, and calcined at 500°C for 3 hours to obtain a modified alumina carrier. Take 0.04g chloroauric acid (HAuCl 4 4H 2 O) Dissolve in 100mL deionized water, add 2.00g of the above-mentioned modified alumina carrier, stir and impregnate at room temperature for 1h, pour off the supernatant, wash the obtained solid three times with deionized water, and then wash it with 15mL 4M After soaking in ammonia water for 8 minutes, filter, and finally wash twice with deionized water, dry the obtained solid at 100°C for 8 hours, and roast at 300°C for 4 hours to obtain Catalyst B, whose composition is shown in Table 1.

Embodiment 3

[0021] Preparation of Catalyst C. 2.50g of γ-alumina (γ-Al 2 o 3 ) with 15mL containing 0.28g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) aqueous solution at room temperature for 2 hours, then rotary evaporated to dryness at 50° C., dried at 80° C. for 3 hours, and calcined at 500° C. for 4 hours to obtain a modified alumina carrier. Take 0.04g chloroauric acid (HAuCl 4 4H 2 O) Dissolve in 100mL deionized water, add 2.00g of the above-mentioned modified alumina carrier, stir and impregnate at room temperature for 2h, pour off the supernatant, wash the obtained solid twice with deionized water, and then wash it with 15mL 4M Soak in ammonia water for 7 minutes, filter, and finally wash with deionized water for 3 times, dry the obtained solid at 90°C for 8 hours, and calcinate at 300°C for 4 hours to obtain catalyst C, whose composition is shown in Table 1.

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Abstract

The invention discloses a supported nano gold catalyst for cyclohexane oxidation and a preparation method thereof. The supported nano gold catalyst is composed of Au, Al, Co, Zr and Ce, wherein Au is used as a main active ingredient of the catalyst with the weight percentage content being 1.0 percent; Al is used as a carrier of the catalyst with the weight percentage content being more than or equal to 90 percent; and Co, Zr and Ce are used as supporting active ingredients of the catalyst with the weight percentage content being 1-7 percent. The preparation method comprises the following steps: modifying the carrier in a revolution dipping method at first and loading gold in a dipping-ammonia washing method. The invention has the advantages of simple preparation method, uniform dispersion of gold particles and high load efficiency. The catalyst provided by the invention has the advantages of good activity and selectivity and low consumption in preparation of cyclohexanone and cyclohexanol through cyclohexane oxidation.

Description

technical field [0001] The invention relates to a supported nano-gold catalyst for cyclohexane oxidation and a preparation method thereof. Background technique [0002] The selective oxidation of cyclohexane is a very important chemical production process. The oxidation products cyclohexanone and cyclohexanol (commonly known as KA oil) are the raw materials for the production of caprolactam and adipic acid, and the latter two are used for the industrial production of nylon- 6 and an important intermediate of nylon-66. In addition, cyclohexanone and cyclohexanol are widely used in the fields of solvents, paints, coatings and pesticides. At present, more than 90% of cyclohexanone and cyclohexanol at home and abroad are produced by cyclohexane oxidation, and 70% of them are non-catalytic oxidation of cyclohexane. However, this process has problems such as low conversion rate of cyclohexane (4-6% per pass molar conversion rate), low selectivity of ketone alcohol (about 80%), h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C27/12C07C49/403C07C45/33C07C35/08C07C29/50
Inventor 朱明乔赵静杨洋洋蔡贞玉唐月沈杨一何潮洪陈新志
Owner ZHEJIANG UNIV
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