Carbon/aluminum oxide composite carrier catalyst for hydrazine decomposition reaction and preparation thereof

A technology of composite carrier and alumina, which is applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst carriers, etc., can solve the problems of reduced catalytic efficiency and easy adsorption, and avoid carbon deposition Inactivation, simple effect of preparation

Inactive Publication Date: 2008-07-02
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 surface of the alumina carrier has certain acidity and hydrophilicity, and it is easy to adsorb hydrazine.
Moreover, there is a strong interaction between alumina and active species, resulting in a decrease in catalytic performance

Method used

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  • Carbon/aluminum oxide composite carrier catalyst for hydrazine decomposition reaction and preparation thereof
  • Carbon/aluminum oxide composite carrier catalyst for hydrazine decomposition reaction and preparation thereof
  • Carbon/aluminum oxide composite carrier catalyst for hydrazine decomposition reaction and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Catalyst C-Al 2 o 3 Preparation of the composite carrier: The alumina surface was carbonized by sucrose impregnation and carbonization.

[0015] Porous alumina (specific surface area ~ 210m 2 / g) impregnated with sucrose solution (sucrose:alumina weight ratio is 0.8:1), then dried at 120°C for 12 hours, then calcined and carbonized at 800°C under nitrogen protection for 1 hour to obtain a carbon / alumina composite carrier.

Embodiment 2

[0017] Catalyst C-Al 2 o 3 Preparation of the composite carrier: carbon treatment on the surface of alumina is carried out by hydrocarbon vapor deposition.

[0018] Porous alumina (specific surface area ~200m 2 / g) into C 6 h 6 / N 2 (25°C saturated steam) gas flow was vapor deposited at 725°C for 1 hour to obtain a carbon / alumina composite carrier.

Embodiment 3

[0020] Catalyst C-Al 2 o 3 Preparation of the composite carrier: carbonize the surface of alumina by furfuryl alcohol polymerization and carbonization.

[0021] Porous alumina (with a specific surface area of ​​~200m 2 / g) Immerse in an equal volume of furfuryl alcohol / ethanol solution (0.2ml furfuryl alcohol: 1g Al 2 o 3 ). Then, polymerization was carried out at 95°C. Then, under the protection of nitrogen, it was calcined and carbonized at 800° C. for 1 hour to obtain a carbon / alumina composite carrier.

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Abstract

The invention provides a carbon/alumina composite carrier catalyst used for hydrazine decomposition reaction and a preparation method thereof. The catalyst showed in the formula is A/C-Al2O3, C-Al2O3 is the carbon/alumina composite carrier, and active constituent A is transition metal Mo, W, Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt or carbonization, nitride and phosphide thereof; wherein, the content of the A is 2-40wt percent and the preparation temperature of the A is 300-900 DEG C. The invention has simple preparation, especially for the preparation of active species of the transitional metal carbonization, which uses H2 instead of CH4/H2 gas used in the past preparation to have direact reduction; the invention prevents carbon deposition on the surface of the carbonization from inactivating, thus being beneficial to acquire more catalytic active sites.

Description

technical field [0001] The invention relates to a carbon / alumina composite carrier catalyst for hydrazine decomposition reaction and its preparation method Background technique [0002] The catalytic decomposition reaction of hydrazine has important applications in the field of attitude control of aerospace vehicles. When the hydrazine decomposition engine is working, the catalyst bed is repeatedly subjected to thermal shocks of hundreds of degrees Celsius and high-speed erosion of high-pressure gas. Therefore, the carrier of the hydrazine decomposition catalyst needs to have good thermal stability, mechanical strength and suitable pore size distribution. [0003] Alumina has been used as a support for hydrazine decomposition catalysts, and has excellent properties in terms of strength, pore structure, and specific surface area. However, the surface of the alumina support has certain acidity and hydrophilicity, and it is easy to adsorb hydrazine. Moreover, there is a stro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/18B01J21/04B01J23/24B01J23/40B01J27/188C06D5/04
Inventor 郑明远舒玉瑛张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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