Tungsten Carbide Hydrazine Decomposition Catalyst
- Details
- Category: Tungsten Information
- Published on Thursday, 26 October 2017 21:19
The attitude control system of the hydrazine decomposition catalyst is widely used in spacecraft.
Since the beginning of 60s the United States successfully developed shell-405 catalyst, rare metal iridium has been a major catalyst for hydrazine decomposition of raw materials.
In the engine, when hydrazine through the catalyst bed immediately decompose and produce high temperature and high pressure gas, the high energy gas in satellite attitude control for satellite speed, orbit, point and attitude control propulsion system and auxiliary propulsion system. Hydrazine /shell-405 propulsion system has the advantages of superior pulse ratio, heavy thrust, good renaturation, sensitive response, high reliability and clean exhaust. It has been the main fuel technology for satellite launch.
The Shell-405 catalyst was prepared by depositing active noble metal iridium onto alumina support, with an iridium content of 33%. In the long-term production practice, tungsten carbide has been proved to have the catalytic effect similar to platinum. Although the catalytic performance of tungsten carbide is slightly different, the performance has been almost the same after the composite reinforcement. The key is that China is the most abundant tungsten resource country, with tungsten carbide instead of energy can greatly reduce the cost of catalyst.
Liquid hydrazine contacts with the catalyst in the attitude control engine and decomposes rapidly to produce a large amount of high temperature and high pressure gas, which produces thrust after high speed discharge. The process requires high mechanical strength, pressure resistance and thermal conductivity of the catalyst support. Tungsten carbide has the characteristics of high mechanical strength, good thermal conductivity, large specific surface, rich pore structure, and so on. It is the most outstanding material in hydrazine catalyst except iridium.
Tungsten carbide catalyst supported on the activated carbon carrier showed a significantly better hydrazine decomposition activity supported on the γ-Al2O3 support, and the carrier had a significant effect on the hydrazine decomposition performance of the catalyst. Activated carbon supported tungsten carbide catalyst exhibited comparable with traditional Ir/ gamma -Al2O3 catalyst for hydrazine decomposition activity and stability of W2N/R1 catalyst has good application prospect in actual use under the condition of the engine.
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