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Method for preparing palladium catalyst with alkali resistance for production of hydrogen peroxide and product

A hydrogen peroxide and palladium catalyst technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of catalyst strength decline, catalyst service life decline, activity Eliminates problems such as component palladium falling off, and achieves the effect of improving industrial applicability

Inactive Publication Date: 2009-04-15
傅骐 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the working fluid in the industrial production of hydrogen peroxide must be recycled, and alkali is used to regenerate the working fluid, which causes the alkali to be carried to the hydrogenation tower to react with the catalyst. Since the current industrial catalyst is basically pure Al 2 o 3 as carrier, Al 2 o 3 It is a kind of amphoteric chemical, which is easy to produce chemical reaction with alkali, so that the strength of the catalyst will decrease, and the active component palladium will fall off, resulting in a decrease in the service life of the catalyst. What is more serious is that some metal palladium may be carried to the oxidation tower behind by the working fluid , resulting in the decomposition of hydrogen peroxide in the oxidation tower and accidents

Method used

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  • Method for preparing palladium catalyst with alkali resistance for production of hydrogen peroxide and product
  • Method for preparing palladium catalyst with alkali resistance for production of hydrogen peroxide and product

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Alumina powder is prepared by neutralizing aluminum sulfate, sodium aluminate and ammonia water, and extruded into Clover strips were baked in an oven at 120°C for 10 hours and roasted at 800°C for 6 hours to obtain an alumina carrier. 500 grams of alumina carrier was impregnated with a mixed solution of 32.5% magnesium nitrate and manganese nitrate with a weight of 715g and a concentration of 32.5%. After washing with water, bake in an oven at 120°C for 10 hours, bake at 900°C for 4 hours, then impregnate with 43.6g of sodium nitrate with a concentration of 40% for 1 hour, and bake in an oven at 120°C for 8 hours to obtain a composite carrier.

[0046] With the ratio of palladium chloride and composite carrier as 0.53%, get 300g composite carrier equal volume impregnation containing 1.59g PdCl 2 Immerse in the solution for 0.5 hours at 80°C, drain and wash, bake at 120°C for 8 hours, and bake at 500°C for 4 hours to obtain sample 1.

[0047] The strength of sample 1 ...

Embodiment 2

[0051] Dry rubber powder in embodiment 1 is made by roll forming method Spherical type, the rest of the conditions remain unchanged, and sample 2 is prepared.

[0052]The strength of sample 2 is 80N / P, the palladium oxide content is 0.345%wt, the hydrogen efficiency is 5.6g / L, and the activity is 3.76KgH 2 o 2 (100%) Kg Cat·d.

[0053] Method 1: After soaking for 30 days, the strength is 70N / P, after soaking for 60 days, the strength is 68N / P, and the content of palladium oxide is 0.345%wt;

[0054] Method 2: After soaking for 30 days, the strength is 78N / P, after soaking for 60 days, the strength is 77N / P, and the content of palladium oxide is 0.345%wt.

Embodiment 3

[0056] In Example 1, the solution of magnesium nitrate and manganese nitrate was changed to 953g, the concentration was 32.5% mixed solution of magnesium nitrate and cerium nitrate, and the other conditions were unchanged, and sample 3 was obtained.

[0057] The strength of sample 3 is 204N / cm, the palladium oxide content is 0.345%wt, the hydrogen efficiency is 6.8g / L, and the activity is 4.57Kg H 2 o 2 (100%) Kg Cat·d.

[0058] Method 1: After soaking for 30 days, the strength is 188N / cm, after soaking for 60 days, the strength is 185N / cm, and the content of palladium oxide is 0.345%wt;

[0059] Method 2: After soaking for 30 days, the strength is 194N / cm, and after soaking for 60 days, the strength is 190N / cm, and the content of palladium oxide is 0.345%wt.

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Abstract

The invention provides a method for preparing a palladium catalyst which has alkali-resistant performance and is used for producing hydrogen peroxide, as well as a product thereof. The method comprises the following steps: a composite carrier consisting of Al2O3 and other metal components is loaded with alkali metal or alkaline earth metal, kept in an oven for 6 to 24 hours at a temperature between 80 and 150 DEG C; and palladium chloride is loaded on the carrier, kept in the oven for 6 to 24 hours at a temperature between 80 and 150 DEG C and roasted for 1 to 5 hours at a temperature between 350 and 1,000 DEG C. The other metal raw materials are two salts selected from magnesium nitrate, ferric nitrate, manganous nitrate, cerous nitrate, cobalt nitrate, nickel nitrate and cadmium nitrate. The alkali metal or the alkaline earth metal raw material is a salt selected from sodium nitrate, potassium nitrate, calcium nitrate, sodium carbonate, potassium carbonate, sodium sulfate, potassium sulphate and calcium sulfate. The catalyst prepared by the method overcomes the defects that the prior catalyst is poor in alkali-resistant performance during application, easy to soften when meeting base catalysts and easy to cause palladium as an active ingredient to fall off. The method greatly improves the industrial applicability of the catalyst in a process of producing hydrogen peroxide through automatic anthraquinone oxidation.

Description

technical field [0001] The invention relates to a preparation method of a palladium catalyst for producing hydrogen peroxide, and in particular discloses a preparation method and a product of a palladium catalyst for producing hydrogen peroxide with alkali resistance. Background technique [0002] Hydrogen peroxide, also known as hydrogen peroxide, is an important green inorganic chemical product, mainly used in pulp bleaching, chemical synthesis, wastewater treatment, electronics, food and other industrial fields. [0003] The industrial production of hydrogen peroxide is still mainly based on the anthraquinone automatic oxidation method, that is, the alkyl anthraquinone is dissolved in an organic solvent to form a working solution, and the alkyl anthraquinone is used as a working carrier to hydrogenate under the action of a catalyst, and the alkyl anthraquinone Anthraquinone is reduced to hydroanthraquinone, and then oxidized with air to obtain the original alkyl anthraqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J23/63B01J23/60C01B15/023
Inventor 傅骐张瑜平
Owner 傅骐
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