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Preparation method for nano Au/MgO catalyst

A catalyst and nanotechnology, which is applied in the field of preparation of nano Au/MgO catalysts, can solve the problems of reducing the catalytic performance of active component gold and increasing the size of gold particles, and achieve the effects of improved activity and simple method.

Inactive Publication Date: 2014-10-01
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To obtain Au / MgO catalyst, high-temperature calcination is required to thermally decompose magnesium hydroxide into magnesium oxide, but calcination will cause Au particles to agglomerate, resulting in larger gold particle size and reducing the catalytic performance of the active component gold

Method used

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  • Preparation method for nano Au/MgO catalyst
  • Preparation method for nano Au/MgO catalyst
  • Preparation method for nano Au/MgO catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Magnesium hydroxide (provided by Hongwei Chemical Factory, Shantou City, Guangdong Province) was ground and passed through a 100-mesh sieve, and the resulting magnesium hydroxide powder was placed in a muffle furnace and calcined at 500 ° C for 3 hours to obtain a MgO carrier. According to the loading of Au Add 0.547g MgO carrier, 1.2mL chloroauric acid tetrahydrate aqueous solution with a mass fraction of 1% to 50mL anhydrous methanol, mix well, then add 1mL1.0mol / L NaOH aqueous solution to adjust the pH of the mixture 9 to 10, the volume ratio of water to anhydrous methanol is 0.04:1, stirred at room temperature for 2 hours, centrifuged and washed with absolute ethanol, placed in an oven and dried at 90°C for 12 hours to obtain a nano-Au / MgO catalyst (see Figure 4 ).

[0018] Gained catalysts were characterized by X-ray powder diffractometer, X-ray photoelectron spectroscopy, and transmission electron microscopy. The results are shown in Figure 1~4 . Depend on fi...

Embodiment 2

[0020] Magnesium hydroxide (provided by Hongwei Chemical Factory, Shantou City, Guangdong Province) was ground and passed through a 100-mesh sieve, and the resulting magnesium hydroxide powder was placed in a muffle furnace and calcined at 500 ° C for 3 hours to obtain a MgO carrier. According to the loading of Au Amount of 1%, 0.547g MgO carrier, 1.2mL mass fraction of 1% chloroauric acid methanol solution is added in 50mL of anhydrous methanol, mix well, then add 2mL of 0.5mol / L NaOH aqueous solution to adjust the pH of the mixed solution to 9 to 10, the volume ratio of water to anhydrous methanol is 0.06:1, stirred at room temperature for 2 hours, centrifuged and washed with absolute ethanol, and dried in an oven at 90°C for 12 hours to obtain a nano-Au / MgO catalyst (see Figure 5 ).

Embodiment 3

[0022] Magnesium hydroxide (provided by Hongwei Chemical Factory, Shantou City, Guangdong Province) was ground and passed through a 100-mesh sieve, and the resulting magnesium hydroxide powder was placed in a muffle furnace and calcined at 500 ° C for 3 hours to obtain a MgO carrier. According to the loading of Au The amount is 1%, 0.547g MgO carrier, 1.2mL methanol solution of chloroauric acid with a mass fraction of 1% are added to 50mL anhydrous methanol, mix well, then add 0.5mL 1.0mol / L NaOH aqueous solution to adjust the pH of the mixture 9 to 10, the volume ratio of water to anhydrous methanol is 0.03:1, stirred at room temperature for 2 hours, centrifuged and washed with absolute ethanol, and dried in an oven at 90°C for 12 hours to obtain a nano-Au / MgO catalyst (see Image 6 ).

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Abstract

The invention discloses a preparation method for a nano Au / MgO catalyst. The preparation method comprises the following steps: firstly calcining magnesium hydroxide powder at the temperature of 450-500 DEG C to obtain a MgO carrier, then with absolute methanol as a solvent and a reducing agent, and preparing the nano Au / MgO catalyst by controlling the volume ratio of water to the absolute methanol under the room-temperature condition. The preparation method disclosed by the invention has the advantages that the simple effect is achieved, the reaction condition is mild, and the active ingredient Au in the prepared catalyst is small in particle diameter and uniform in dispersion; the catalyst is used for reaction in preparation of benzaldehyde by liquid phase catalysis for oxidation of benzyl alcohol, and is high in catalytic activity, and the conversion ratio of benzyl alcohol can reach more than 95% and the yield of benzaldehyde can reach about 90%.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a nanometer Au / MgO catalyst. Background technique [0002] At present, the industrial mass production methods of benzaldehyde include toluene oxidation and toluene chlorination hydrolysis. In addition to the target product benzaldehyde, there are by-products such as hydrocarbons and maleic acid in the toluene oxidation reaction. The preparation process is long, the reaction conditions are high, the requirements for equipment are high, and the consumption of acid and alkali raw materials is large and difficult. Recycling is a waste of resources and pollutes the environment, and the conversion rate of benzyl alcohol is low, the selectivity of benzaldehyde is also low, and the product contains chloride ions and chlorides, which limits its application in spices and medicine. The methods for preparing benzaldehyde include hydrogenation...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J37/16C07C45/38C07C47/54
Inventor 许春丽王寒飞王珍
Owner SHAANXI NORMAL UNIV
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