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Pt-Fe/C catalyst as well as preparation method and application thereof

A catalyst, pt-fe technology, applied in the field of precious metal catalyst preparation, can solve the problems of unfavorable industrialization and high production cost of carbon nanotubes, and achieve the effects of narrow distribution, reduction of product separation and purification steps, and simple preparation steps

Pending Publication Date: 2019-01-18
CHENZHOU GAOXIN PLATINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst can effectively inhibit dehalogenation, but the production cost of carbon nanotubes is high, which is not conducive to industrialization

Method used

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  • Pt-Fe/C catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Activated carbon was treated with 10wt% hydrogen peroxide for 1 hour, and the solid-to-liquid ratio (g / mL) was 1:10, washed and dried as a carrier for subsequent use;

[0033] 2. Dissolve chloroplatinic acid containing 0.1g of platinum and 0.96g of ferric chloride hexahydrate in 16mL of ethylene glycol solvent, add 1.0g of oleic acid as a carrier modifier, stir for 30min, and prepare the active component impregnation solution;

[0034] 3. Add the active component impregnation solution to 9.7g of hydrogen peroxide-treated activated carbon, stir and absorb, and let stand for 16 hours to obtain a carbon carrier loaded with platinum and iron;

[0035] 4. Add 0.5g of formaldehyde solution into 80mL of ethylene glycol solvent, stir evenly and add it into the carrier of platinum and iron in step (3), stir and disperse for 30min, add 10wt% NaOH solution dropwise to adjust the pH of the system to 12~ 13. Raise the temperature to 80°C, keep it warm for 1.5h, add 80mL ethanol a...

Embodiment 2

[0037] 1. Activated carbon was treated with 10wt% hydrogen peroxide for 1 hour, and the solid-to-liquid ratio was 1:10, washed and dried for later use;

[0038] 2. Dissolve chloroplatinic acid containing 0.2g of platinum and 1.94g of ferric chloride hexahydrate in 32mL of ethylene glycol, add 2.0g of oleic acid, stir for 30min, and prepare the active component impregnation solution;

[0039] 3. Add the active component impregnating solution to 19.4 g of oxidized activated carbon, stir and absorb, and let it stand for 16 hours to obtain a carbon carrier loaded with platinum and iron;

[0040] 4. Dissolve 0.8g of sodium formate in 150mL of ethylene glycol, stir evenly and add it into the carrier of platinum and iron in step (3), stir and disperse for 30min, add 10wt% NaOH solution dropwise to adjust the system pH=12~13, Raise the temperature to 80°C, keep it warm for 1.5h, add 150mL ethanol aqueous solution with a volume ratio of 1:1 to dilute, let it stand for aging, filter, wa...

Embodiment 3

[0042]Same as Example 1, except that the amount of ferric chloride hexahydrate is 0.49g, and the obtained catalyst is a 1%Pt-1%Fe / C catalyst.

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Abstract

The invention discloses a Pt-Fe / C catalyst as well as a preparation method and application thereof. The catalyst is composed of an active component and a carrier, wherein the active component is platinum, iron and oxide of iron; the carrier is active carbon; Pt accounts for 0.5-3% of the total mass of the catalyst, and a Fe / Pt mass ratio is (0.5 to 4) : 1. The preparation method of the catalyst comprises the following preparation steps: preparing a platinum-iron active component impregnation solution, performing equal-volume loading, performing in-situ reduction, washing and drying. The catalyst is used for preparing chloroaniline by chloronitrobenzene hydrogenation though a no-solvent method; dechloridation can be effectively restrained in case of not adding a dehalogenation inhibitor, and the advantages of good reaction activity and high selectivity are achieved. Under the conditions of no solvent and auxiliaries, the dosage of the catalyst is 0.8% of the mass of chloronitrobenzene,the reaction temperature is 90 DEG C, hydrogenation pressure is 1.0 MPa, reaction can be completed with two hours, and dechlorination amount is less than 0.1%.

Description

technical field [0001] The invention belongs to the technical field of preparation of noble metal catalysts, and in particular relates to a Pt-Fe / C catalyst and its preparation method and application. Background technique [0002] Chloroaniline is an important intermediate used in the synthesis of dyes, medicines, and pesticides. The market demand is large. The main production method is the reduction of chloronitrobenzene. Among them, the iron powder reduction method and the alkali sulfide reduction method are very serious environmental pollution. The catalytic hydrogenation method has low pollution and high product quality, but due to severe dehalogenation, it causes equipment corrosion and product purity decline. Therefore, how to suppress the dechlorination problem in the catalytic hydrogenation of chloronitrobenzene is the focus and difficulty of current research . At present, there are mainly two methods: one is to add additives to the reaction system to inhibit dehalo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10C07C209/36C07C211/52
CPCC07C209/36B01J23/8906B01J35/618C07C211/52
Inventor 欧阳文兵雷婧杨拥军叶咏祥雷涤尘杨静
Owner CHENZHOU GAOXIN PLATINUM
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