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A kind of platinum/carbon-bentonite catalyst and its preparation method and application

A bentonite and catalyst technology, which is applied in the field of preparation of precious metal catalysts, can solve the problems of high production cost, unfavorable industrialization, and high price of carbon nanotubes, and achieve the goal of improving product quality, reducing pollution and energy consumption, and reducing product separation and purification steps Effect

Active Publication Date: 2021-04-20
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 carbon nanotubes are expensive and the production cost is high, which is not conducive to industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) After mixing activated carbon and bentonite in a ratio of 4:1, grind to 200 mesh, ultrasonically treat at 30 Hz, then pretreat with 10% hydrogen peroxide at room temperature for 3 hours, liquid-solid ratio 20:1, wash, dry;

[0033] (2) Get a chloroplatinic acid solution containing 0.2g of platinum, add deionized water to a total volume of 30mL, and stir evenly to obtain a platinum impregnating solution;

[0034] (3) Take 19.8 g of the pretreated carrier, add the above-mentioned platinum impregnating solution into it, stir well, and let it stand at room temperature for 6 hours;

[0035] (4) Add 200 mL of deionized water to the catalyst precursor of (3), stir and slurry, adjust the pH value of the slurry to 8 with sodium hydroxide solution, heat up to 60° C., add 1.2 g of 80% hydrazine hydrate, and keep warm for 2 hours. Sample 1 was obtained after static aging, washing and drying. The platinum content of the sample was detected by ICP-AES to be 0.99%.

Embodiment 2

[0037] (1) After mixing activated carbon and bentonite in a ratio of 2:1, grind to 200 mesh, ultrasonically treat at 35Hz, then pretreat with 20% hydrogen peroxide at room temperature for 1 hour, liquid-solid ratio 20:1, wash, dry;

[0038] (2) Get a chloroplatinic acid solution containing 0.2g of platinum, add deionized water to a total volume of 30mL, and stir evenly to obtain a platinum impregnating solution;

[0039] (3) Take 19.8 g of the pretreated carrier, add the above-mentioned platinum impregnating solution into it, stir well, and let it stand at room temperature for 8 hours;

[0040] (4) Add 200 mL of deionized water to the catalyst precursor of (3), stir and slurry, adjust the pH value of the slurry to 10 with sodium hydroxide solution, heat up to 80° C., add 1.5 g of 37% formaldehyde, keep it warm for 3 hours, and Stand for aging, wash and dry to obtain sample 2. As detected by ICP-AES, the platinum content of the sample was 1.0%.

Embodiment 3

[0042] (1) Mix activated carbon and bentonite in a ratio of 2:1, grind to 200 mesh, ultrasonically treat at 40 Hz, then pretreat activated carbon with 10% hydrogen peroxide at room temperature for 4 hours, liquid-solid ratio 15:1, wash ,dry.

[0043] (2) Get the chloroplatinic acid solution containing 100g platinum, add deionized water to a total volume of 16L, stir evenly to obtain a platinum impregnating solution;

[0044] (3) Take 9900 g of the pretreated carrier, add the above-mentioned platinum impregnation solution into it, stir evenly, and let stand at room temperature for 8 hours;

[0045](4) Add 120 L of deionized water to the catalyst precursor of (3), stir and slurry, adjust the pH value of the slurry to 11 with sodium hydroxide solution, raise the temperature to 60 ° C, add 5 L of 2% sodium borohydride solution, and keep warm for 2 hours , Sample 3 was obtained after static aging, washing and drying. The platinum content of the sample was detected by ICP-AES to b...

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Abstract

The invention belongs to the field of preparation of noble metal catalysts, and discloses a platinum / carbon-bentonite catalyst as well as a preparation method and application thereof. The catalyst comprises an active component and a carrier, the active component is 0.3-3.0 wt% Pt, and the carrier is a mixture of active carbon and bentonite. The preparation process of the catalyst in the invention is simple, reusable, and no metal elements other than platinum are added, the difficulty of recycling the precious metal catalyst is not increased, and pollution and energy consumption are reduced. When the catalyst is used for the catalytic hydrogenation of halonitrobenzenes to prepare haloanilines, it is not necessary to add dechlorination aids, and while maintaining high activity and selectivity, it can effectively suppress the occurrence of dechlorination side reactions (the amount of dechlorination is less than 0.1%), reducing product separation and purification steps and improving product quality.

Description

technical field [0001] The invention belongs to the technical field of preparation of noble metal catalysts, and in particular relates to a platinum / carbon-bentonite catalyst and its preparation method and application. Background technique [0002] Chloroaniline has a wide range of uses and is an important intermediate used in the synthesis of dyes, medicines and pesticides, etc., and has a large market demand. The main method of producing chloroaniline is the reduction of chloronitro compounds, including iron powder reduction method, alkali sulfide reduction method and catalytic hydrogenation method. Iron powder reduction method and alkali sulfide reduction method will produce more than ten tons of high-concentration organic wastewater and toxic sludge for every 1 ton of chloroaniline produced, which seriously pollutes the ecological environment and the treatment cost is very high. Catalytic hydrogenation has attracted much attention due to its low pollution and high produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J35/00B01J37/02B01J37/34C07C209/36C07C211/52
CPCC07C209/365B01J23/42B01J37/0207B01J37/343B01J35/399C07C211/52
Inventor 雷婧欧阳文兵杨拥军雷涤尘杨静
Owner CHENZHOU GAOXIN PLATINUM