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A kind of preparation method of activated carbon supported platinum nanocrystal catalyst

A technology of activated carbon and platinum nanometers, which is applied in the field of platinum catalyst preparation, can solve problems such as narrow distribution range, uneven dispersion, and large platinum particle size, and achieve the effects of narrow distribution range, high catalytic activity, and small particle size

Active Publication Date: 2022-05-03
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing an activated carbon-supported platinum nanocrystal catalyst, which effectively solves the problem of large particle size and uneven dispersion of platinum, and the prepared platinum nanocrystal The average particle size of the crystal is 1.41-1.65nm, the particle size is small and the distribution range is narrow, the catalyst has high catalytic activity in the catalytic reduction reaction, the life is stable, and can be used repeatedly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the active carbon supported platinum nanocrystal catalyst of the present embodiment comprises the following steps:

[0027] Step 1. Place 99g of activated carbon carrier in 2L of dilute hydrochloric acid solution with a concentration of 1.0mol / L, soak for 24 hours at 25°C to remove ash, filter, and wash the filtered activated carbon carrier to pH = 6, which is the same as that of 1L with a concentration of Mix 1.65mol / L hydrogen peroxide evenly and add it to a hydrothermal kettle, treat it at 250°C for 2 hours, cool to room temperature, filter, wash, and bake in a vacuum oven at 110°C for 12 hours to remove moisture, and get the treated activated carbon carrier The hydrogen peroxide of described 1.65mol / L refers to the hydrogen peroxide aqueous solution that hydrogen peroxide concentration is 1.65mol / L;

[0028] Step 2: Add 5g of precipitating agent, 50g of protecting agent and 6g of complexing agent into 200mL of potassium chloroplatinite solu...

Embodiment 2

[0033] This embodiment is the same as Embodiment 1, the difference being that,

[0034] Precipitant described in step 2 is Na 2 CO 3 , NaHCO 3 、K 2 CO 3 、KHCO 3 Or ammonia water with a mass concentration of 18%;

[0035]The protective agent described in step 2 is polyvinylpyrrolidone, glucose, ethylene glycol, isopropanol or oleic acid, or three or more of polyvinylpyrrolidone, glucose, ethylene glycol, isopropanol and oleic acid, or is Polyvinylpyrrolidone and dextrose, or polyvinylpyrrolidone and ethylene glycol, or polyvinylpyrrolidone and isopropanol, or polyvinylpyrrolidone and oleic acid, or dextrose and ethylene glycol, or dextrose and isopropanol , or glucose and oleic acid, or ethylene glycol and isopropanol, or isopropanol and oleic acid;

[0036] Wherein, the polyvinylpyrrolidone is PVP-K30 polyvinylpyrrolidone, and the addition method of polyvinylpyrrolidone is powder or is prepared into a polyvinylpyrrolidone solution with a mass fraction of 8%, for example...

Embodiment 3

[0084] The preparation method of the active carbon supported platinum nanocrystal catalyst of the present embodiment comprises the following steps:

[0085] Step 1. Place 99g of activated carbon carrier in 2L of dilute hydrochloric acid solution with a concentration of 3.5mol / L at 95°C for 2 hours to remove ash, filter, wash the filtered activated carbon carrier to pH=7, and 1L with a concentration of 6.6mol / L L of hydrogen peroxide was mixed evenly and added to a hydrothermal kettle, treated at 350°C for 1 hour, cooled to room temperature, filtered, washed, and baked in a vacuum oven at 110°C for 12 hours to remove moisture to obtain the treated activated carbon carrier;

[0086] Step 2: Add 10g of precipitating agent, 100g of protecting agent and 12g of complexing agent into 200mL of potassium chloroplatinite solution with a platinum mass concentration of 0.005g / mL, and reflux at 90°C for 0.5h to obtain a platinum complex Precursor solution; the precipitation agent is urea; ...

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PUM

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Abstract

The invention discloses a method for preparing an activated carbon-supported platinum nanocrystal catalyst, which comprises the following steps: step 1, placing the activated carbon carrier in dilute hydrochloric acid solution for pretreatment, filtering, washing, and placing in hydrogen peroxide, cooling, filtering, washing, drying to obtain the treated activated carbon carrier; step 2, adding the precipitating agent, protective agent and complexing agent to the potassium chloroplatinite solution, and refluxing to obtain the platinum complex precursor solution; step 3, adding the modifier, The oxidizing agent and the reducing agent are added to the platinum complex precursor solution to obtain the platinum nanocrystal mixed solution; step 4, the activated carbon carrier is added to the platinum nanocrystal mixed solution, ultrasonically dispersed, left standing, filtered, washed, and dried dry to obtain platinum nanocrystalline catalyst supported on activated carbon. The method effectively solves the problem of large platinum particle size and uneven dispersion, the platinum nanocrystal particle size is small and the distribution range is narrow, the catalyst has high catalytic activity in the catalytic reduction reaction, the service life is stable, and can be reused many times.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of platinum catalysts, and in particular relates to a preparation method of activated carbon-supported platinum nanocrystal catalysts. Background technique [0002] Carbon-supported platinum nanocrystalline catalysts have excellent comprehensive properties such as high activity, good selectivity, and high atom utilization, and are widely used in pesticides, medicines, dyes, and petrochemical industries. The dispersion degree, size and crystal plane morphology of platinum nanocrystals on activated carbon support are the key factors affecting the catalyst performance. The traditional industrial preparation process is the impregnation method or co-precipitation method. The platinum particle size distribution range of the catalyst prepared by this method is wide, the platinum particle size is large and the exposed crystal surface is uncontrollable, resulting in low utilization efficiency o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J35/02B01J35/10B82Y30/00B82Y40/00B01J35/00
CPCB01J23/42B82Y30/00B82Y40/00B01J35/394B01J35/40B01J35/61
Inventor 张鹏闫江梅李岳锋唐良李凡万克柔曾永康
Owner XIAN CATALYST NEW MATERIALS CO LTD