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Method for preparing carbon-loading noble metal catalyst by solvothermal method

A technology of noble metal catalysts and solvothermal method, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems that carbon-supported noble metal catalysts are not involved, and achieve good dispersion effect

Inactive Publication Date: 2019-03-08
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So can the solvothermal method be applied to the preparation of carbon-supported noble metal catalysts? So far, the solvothermal method is mainly used to prepare transition metal catalysts, such as phosphomolybdovanadic acid nanocatalysts prepared by Zhang Suojiang (CN201710403534.2) and a method for preparing BiOCl photocatalysts by a solvothermal method such as Wang Yingying (CN107649153A), However, it has not been involved in the development of carbon-supported noble metal catalysts

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  • Method for preparing carbon-loading noble metal catalyst by solvothermal method

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Embodiment 1

[0026] In this embodiment, a Pd / C catalyst is prepared by a solvothermal method, and the specific methods include:

[0027] Step 1. Select a particle size distribution of 200 mesh to 400 mesh and a specific surface area of ​​950m 2 / g~1000m 2 / g of activated carbon, the activated carbon is added to the nitric acid solution with a mass concentration of 10%, soaked at 20°C for 24 hours, then washed with deionized water until neutral, then dried the washed activated carbon, The drying temperature is 120°C to obtain pretreated activated carbon with a moisture content not greater than 1%;

[0028] Step 2, the palladium chloride of metering ratio is dissolved in the mixed solvent of 1000mL ethylene glycol and water, and the volume percentage composition of ethylene glycol in the mixed solvent is 95%, then adds the gac of pretreatment in 50g step 1, stirs to The activated carbon is evenly dispersed to obtain a mixed slurry;

[0029] Step 3, placing the mixed slurry described in st...

Embodiment 2

[0033] This embodiment adopts solvothermal method to prepare Pt / C catalyst, and specific method comprises:

[0034] Step 1. Select a particle size distribution of 200 mesh to 400 mesh and a specific surface area of ​​1000m 2 / g~1300m 2 / g of activated carbon, add activated carbon to tartaric acid solution with a mass concentration of 20%, soak it at 30°C for 24 hours, then wash the soaked activated carbon with deionized water until neutral, then dry the washed activated carbon, The drying temperature is 100°C to obtain pretreated activated carbon with a moisture content not greater than 1%;

[0035] Step 2, dissolving the potassium chloroplatinate of the metered ratio in the mixed solvent of 1000mL formamide and water, the volume percentage of formamide in the mixed solvent is 95%, then add the activated carbon pretreated in 100g step 1, and stir until The activated carbon is evenly dispersed to obtain a mixed slurry;

[0036] Step 3, placing the mixed slurry described in s...

Embodiment 3

[0040] In this embodiment, a Pd / C catalyst is prepared by a solvothermal method, and the specific methods include:

[0041] Step 1. Select a particle size distribution of 200 mesh to 400 mesh and a specific surface area of ​​1300m 2 / g~1500m 2 / g of activated carbon, add the activated carbon into the nitric acid solution with a mass concentration of 1%, soak it at 100°C for 5 hours, then wash the soaked activated carbon with deionized water until neutral, then dry the washed activated carbon, The drying temperature is 100°C to obtain pretreated activated carbon with a moisture content not greater than 1%;

[0042] Step 2. Dissolve the palladium nitrate of the metered ratio in a mixed solvent of 1000mL formamide and water, the volume percentage of formamide in the mixed solvent is 80%, then add 200g of the pretreated activated carbon in step 1, and stir until the activated carbon is dispersed Uniformly, get mixed slurry;

[0043] Step 3, placing the mixed slurry described in...

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Abstract

The invention discloses a method for preparing a carbon-loading noble metal catalyst by a solvothermal method. The method comprises the following steps: I, pre-treating activated carbon; II, uniformlydispersing a water soluble noble metal compound and the pre-treated activated carbon in a solvent to obtain mixed slurry; III, putting the mixed slurry in a closed pressure container, and keeping thetemperature for 2-24 hours at 140-240 DEG C; and IV, naturally cooling the insulated closed pressure container to filter a product in the closed pressure container, and washing the filtered intercepted objects with deionized water to obtain the carbon-loading noble metal catalyst. The carbon-loading noble metal catalyst which is high in dispersibility is prepared by means of the solvothermal method. A novel concept is provided for preparing the carbon-loading noble metal catalyst. By taking ethylene glycol and water or formamide and water as a solvent, a series of carbon-loading noble metal catalysts which are high in dispersibility are prepared by means of high-temperature reducibility of ethylene glycol and formamide and the complexing ability with noble metals.

Description

technical field [0001] The invention belongs to the technical field of carbon-supported noble metal catalysts, and in particular relates to a method for preparing carbon-supported noble metal catalysts by a solvothermal method. Background technique [0002] So far, the preparation methods of carbon-supported noble metal catalysts mainly include impregnation method, colloid method, ion exchange method and chemical vapor deposition method, etc. The reduction methods are mainly chemical reduction method and hydrogen reduction. In the chemical reduction method, the reducing agent is mainly formic acid, Sodium formate, formaldehyde, sodium borohydride and hydrazine hydrate, etc. Chen Xinhua (parameter analysis of catalysts with uneven distribution of active components prepared by impregnation method. Petrochemical Industry, 1992, 21(8): 557-562) pointed out in his research: in the process of catalyst preparation, the impregnation method and reduction method affect the catalyst. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/42B01J23/46B01J35/10
CPCB01J23/42B01J23/44B01J35/617
Inventor 张磊李岳锋翟康王昭文李小虎曾永康张之祥
Owner XIAN CATALYST NEW MATERIALS CO LTD
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