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Precious metal-modified carbide catalyst for preparation of hydrogen peroxide, and preparation and application thereof

A carbide and catalyst technology, which is applied in the field of noble metal modified carbide catalysts for preparing hydrogen peroxide, can solve the problems of limited application of carbide catalysts, easy oxidation and deactivation of carbide catalysts, etc., and achieves large market application value and synthesis method. Ease of operation and the effect of reducing the load

Inactive Publication Date: 2018-05-25
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

However, the anthraquinone method has obvious disadvantages: the use of organic solvents, the coexistence of hydrogen, oxygen, hydrogen peroxide and organic solvents in the process brings certain dangers to production
Transition metal carbide catalysts are easily oxidized and deactivated under normal pressure, which greatly limits the application of carbide catalysts

Method used

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  • Precious metal-modified carbide catalyst for preparation of hydrogen peroxide, and preparation and application thereof
  • Precious metal-modified carbide catalyst for preparation of hydrogen peroxide, and preparation and application thereof
  • Precious metal-modified carbide catalyst for preparation of hydrogen peroxide, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of 5% Pd / Mo 2 For samples of C, weigh Pd(NO 3 ) 2 ·nH 2 O 0.0662g and (NH 4 )6 Mo 7 o 24 4H 2 O 1.039g were dissolved in deionized water to form a solution.

[0030] (2) Mix the above solutions with each other, stir at 80°C for 2-3h, let stand for 2h, then dry at 110°C, and then bake at 550°C for 4h in an air atmosphere to obtain PdMoO x catalyst.

[0031] (3) PdMoO x Press it into 20-40 meshes, weigh the samples required for the reaction and place them in a quartz reactor. 4 -H 2 (CH 4 / H 2 =1:4) in a mixed atmosphere of temperature-programmed carbonization, when the temperature rises from room temperature to 300°C, the heating rate is 5°C / min, and from 300°C to the final carbonization temperature (700°C), the heating rate is 1°C / min, At the final carbonization temperature, keep the temperature constant for 120 minutes, drop to room temperature in an argon atmosphere, and use 1% O 2 / Ar passivation for 12h, finally get 5%Pd / Mo 2 C catalys...

Embodiment 2

[0033] Experiments were carried out in a similar manner to Example 1, but the temperature of the reaction during the preparation of the precursor was adjusted to 50°C to obtain the product 5%Pd / Mo 2 C-PdMoO-50 catalyst.

Embodiment 3

[0035] The method similar to Example 1 is used for experiments, but the heating rate in the carbonization process is changed to 5°C / min, and the product 5%Pd / Mo can be obtained 2 C-5 catalyst.

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Abstract

The invention provides a precious metal-modified carbide catalyst for preparation of hydrogen peroxide, and a preparation method and application thereof. The carbide is molybdenum carbide or tungstencarbide, wherein the molybdenum carbide is Mo2C and / or MoC, and the tungsten carbide is W2C and / or WC; the carbide is used as a carrier of the catalyst; and precious metal, which is one or more selected from a group consisting of metal palladium, metal platinum or metal gold, is used as an active component of the catalyst. The preparation method for the catalyst is an impregnation method, a coprecipitation method, a deposition-precipitation method or a sol-gel method. The invention also provides the application of the catalyst to direct synthesis of hydrogen peroxide from oxyhydrogen. The catalyst integrates the characteristics of both the precious metal and the carbide, especially the precious metal-like properties of molybdenum carbide and tungsten carbide, and the carbide is used for catalytic preparation of hydrogen peroxide, so the loading amount of the precious metal in the catalyst is reduced. The preparation method of the invention is simple and easy to implement, green, safe and non-toxic, and better meets the requirements of sustainable development.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a noble metal modified carbide catalyst for preparing hydrogen peroxide and its preparation and application. Background technique [0002] Hydrogen peroxide is an important inorganic chemical, which can be used as an oxidant, disinfectant, bleach, deoxidizer, etc., and is widely used in papermaking, chemical industry, environmental protection, electronics, aerospace and other industries. Hydrogen peroxide is used as a green oxidant, and the products after use are water and oxygen, so it has no pollution to the environment. It is a green chemical. In recent years, in the new green chemical industry, hydrogen peroxide has been widely used as a green chemical in the production of caprolactam, cyclohexanone, hydroquinone, propylene oxide and other products. It is precisely because of the increase in the application of hydrogen peroxide that the output of hydrogen p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C01B15/029
CPCB01J27/22C01B15/029
Inventor 黄家辉春田正毅张少华吕强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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