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Preparation method of sulfur poisoning-resistant palladium-carbon catalyst

A palladium-carbon catalyst and sulfur poisoning technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to inhibit the increase of grain size and prevent direct reduction , the effect of good sulfur resistance performance

Inactive Publication Date: 2017-02-08
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, up to now, there has not been a palladium-carbon catalyst with simple process and excellent anti-sulfur poisoning performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the palladium-carbon catalyst resistant to sulfur poisoning in this embodiment includes the following steps:

[0029] Step 1. Use nitric acid with a concentration of 5% by mass to pickle the activated carbon. The specific process is: place the activated carbon in nitric acid with a concentration of 5% by mass, and reflux for 1 hour at a temperature of 90°C; The activated carbon after acid washing is washed to neutrality, and then the washed activated carbon is dried;

[0030] Step 2: Mix the copper salt, sodium thiosulfate and deionized water uniformly to prepare a salt solution, and then place the activated carbon dried in step 1 in the salt solution and immerse it at a temperature of 70°C 1h to obtain activated carbon slurry; the copper salt is copper chloride, the concentration of the copper salt in the salt solution is 0.02 mol / L, and the concentration of sodium thiosulfate is 0.015 mol / L;

[0031] Step 3: Mix the palladium compound and deionized...

Embodiment 2

[0035] The preparation method of the palladium-carbon catalyst resistant to sulfur poisoning in this embodiment includes the following steps:

[0036] Step 1. Use nitric acid with a concentration of 10% by mass to pickle the activated carbon. The specific process is: place the activated carbon in nitric acid with a concentration of 10% by mass, and reflux for 1.5h at a temperature of 100°C; Wash the acid-washed activated carbon with water to neutrality, and then dry the washed activated carbon;

[0037] Step 2: Mix copper salt, sodium thiosulfate and deionized water uniformly to prepare a salt solution, and then place the activated carbon dried in step 1 in the salt solution at a temperature of 70°C to 90°C Under the conditions of immersion for 1h-2h, an activated carbon slurry is obtained; the copper salt is copper acetate, the concentration of the copper salt in the salt solution is 0.05 mol / L, and the concentration of sodium thiosulfate is 0.04 mol / L;

[0038] Step 3: Mix the pal...

Embodiment 3

[0042] The preparation method of the palladium-carbon catalyst resistant to sulfur poisoning in this embodiment includes the following steps:

[0043] Step 1. Use nitric acid with a concentration of 15% by mass to pickle the activated carbon. The specific process is: place the activated carbon in nitric acid with a concentration of 15% by mass and reflux for 3h at a temperature of 95°C; The activated carbon after acid washing is washed to neutrality, and then the washed activated carbon is dried;

[0044] Step 2: Mix the copper salt, sodium thiosulfate and deionized water uniformly to prepare a salt solution, and then place the activated carbon dried in step 1 in the salt solution and immerse it at a temperature of 90°C 1.5h to obtain activated carbon slurry; the copper salt is copper acetate, the concentration of the copper salt in the salt solution is 0.08 mol / L, and the concentration of sodium thiosulfate is 0.065 mol / L;

[0045] Step 3: Mix the palladium compound and deionized w...

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Abstract

The invention provides a preparation method of a sulfur poisoning-resistant palladium-carbon catalyst. The preparation method comprises the following steps: 1, performing acid pickling treatment on activated carbon, then washing the activated carbon subjected to acid pickling treatment with water until the activated carbon is neutral, and drying the washed activated carbon; 2, putting the activated carbon into saline solution to obtain activated carbon slurry; 3, uniformly mixing a palladium compound with deionized water to obtain a palladium solution; 4, dripping the palladium solution into the activated carbon slurry for soaking, then adjusting the pH value of the system, and filtering to obtain a filter cake; 5, pulping the filter cake with pure water, adding a reducing agent for reduction, and washing with water to obtain the palladium-carbon catalyst. The preparation process is simple; the sulfur poisoning resistance of the palladium-carbon catalyst prepared by the preparation method is obviously improved, and the service life of the catalyst is substantially prolonged.

Description

Technical field [0001] The invention belongs to the technical field of catalyst preparation, and specifically relates to a preparation method of a palladium-carbon catalyst resistant to sulfur poisoning. Background technique [0002] Palladium-carbon catalyst has high catalytic activity and good selectivity, and it plays a pivotal role in petrochemical, fine chemical and organic synthesis. Since it was discovered in 1872 that palladium-carbon has a catalytic effect on the nitro hydrogenation reduction reaction on the benzene ring, the catalytic hydrogenation of palladium-carbon due to its advantages such as simple process, high conversion rate, high yield, and less three wastes has caused a great Big attention. [0003] Palladium-carbon catalysts are more sensitive to poisons when used in the catalytic hydrogenation of organic substances. In essence, the poisoning of the catalyst means that the active center of the catalyst surface reacts with a certain substance in the reaction s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44
CPCB01J23/44
Inventor 闫江梅李岳锋张鹏曾永康曾利辉张之翔
Owner XIAN CATALYST NEW MATERIALS CO LTD
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