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A highly dispersed monolithic catalyst for hydrogen peroxide synthesis and its preparation method and application

A technology of monolithic catalysts and catalysts, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc.

Active Publication Date: 2016-08-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, there is no report in the prior art on the application of a highly dispersed and supported monolithic catalyst containing a molecular sieve-oxide coating carrier with a hierarchical pore structure in the heterogeneous catalytic reaction of anthraquinone hydrogenation

Method used

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  • A highly dispersed monolithic catalyst for hydrogen peroxide synthesis and its preparation method and application
  • A highly dispersed monolithic catalyst for hydrogen peroxide synthesis and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1) Coating preparation:

[0056] 10g γ-Al 2 o 3 , 10g Y-type molecular sieve, 4.2g KNO 3 , 60g of nitric acid solution with a concentration of 2wt.% is mixed in a 100ml ball mill tank, and the rotating speed of the ball mill is adjusted to 500r / min. After ball milling for 6 hours, the pH of the slurry is adjusted to be between 3-4 to obtain the catalyst molecular sieve-oxide Coating carrier slurry.

[0057] Select a monolithic catalyst carrier with a pore size of 400 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the monolithic catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 16% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 500° C. for 2 h.

[0058] 2) Active ingredient upload:

[0059] Get above-mentioned catalyst...

Embodiment 2

[0063] 1) Coating preparation:

[0064] 10g TiO 2 , 2g ZSM-5 molecular sieve, 60gH 2 O was mixed in a 100ml spherical ink tank, and the rotating speed of the ball mill was adjusted to 500r / min. After ball milling for 6 hours, the pH of the slurry was adjusted to be between 3-4 to obtain catalyst molecular sieve-oxide coating carrier slurry.

[0065] Select a monolithic catalyst carrier with a pore size of 400 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the monolithic catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 23% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 500° C. for 2 hours.

[0066] Take the above carrier impregnated with 0.1mol / L Mg(NO 3 ) 2 The solution was dried and then baked in a muffle furnace at 500°C f...

Embodiment 3

[0071] 1) Coating preparation:

[0072] SiO was crushed using a jet mill 2 , the β-type molecular sieve material is crushed to a particle size of 2-7μm, and then 5g of SiO 2 , 18gβ-type molecular sieve, add 3.7g K 2 SO 4 , 60gH 2 O, after stirring into a suspension, the catalyst molecular sieve-oxide-coated carrier slurry is obtained.

[0073] Select a monolithic catalyst carrier with a pore size of 400 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the monolithic catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 32% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 500° C. for 2 h.

[0074]The loading method and reduction process of the noble metal active component of the catalyst are the same as in Example 2 to obtain catalys...

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Abstract

The invention provides a high-dispersion monolithic catalyst for hydrogen peroxide synthesis, and a preparation method and an application thereof. A main active component which is one or a combination containing two of noble metals comprising Pd and Pt is supported on an inert honeycomb carrier having a regular structure and coated with a molecular sieve-oxide composite coating to prepare monolithic catalyst. The coating carrier of the monolithic catalyst has a microporous-mesoporous composite hierarchical pore structure, wherein micropores are beneficial to improve the dispersion and hydrogen atom overflow of the active metal(s) in order to improve the hydrogenation activity of the catalyst and reduce the dosage of the noble metal(s); and mesopores provide diffusion channels for reactants and products, are conducive to mass transfer in the mesopores and effectively avoid the formation of a large amount of byproducts in order to improve the selectivity of the catalyst. In addition, the pH value of the molecular sieve carrier can be easily adjusted, so the performances of the catalyst can be further improved. The catalyst can be used in the production process of hydrogen peroxide through catalytic hydrogenation of anthraquinone, and allows the space-time yield of hydrogen peroxide to reach 2.5-5.5kgH2O2(100%) g<Pd><-1>d<-1> and be higher than data of 1-1.8kgH2O2g<Pd><-1>d<-1> in industrial operation.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to an anthraquinone hydrogenation integral catalyst and a preparation method thereof. Background technique [0002] Hydrogen peroxide is an important inorganic chemical, which can be used as an oxidant, bleach, disinfectant, deoxidizer, etc., and is widely used in papermaking, chemical industry, environmental protection, electronics, aerospace and other industries. The product of hydrogen peroxide after use is water and oxygen, which has no pollution to the environment and is a green chemical. In recent years, in the new green chemical industry, such as caprolactam, cyclohexanone, hydroquinone, propylene oxide and other products, hydrogen peroxide is used as the oxidant in the production process, further opening up new application fields of hydrogen peroxide. With the continuous deepening of the concept of developing green chemistry, the hydrogen peroxide industry ...

Claims

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Application Information

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IPC IPC(8): B01J29/12B01J29/44B01J29/74C01B15/023
Inventor 王树东李晓彤苏宏久陈海军任高远
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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