Use of carbon-supported transitional metal carbides catalyst in hydrazine decomposition reaction

A transition metal, supported catalyst technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of no patents and literature reports, etc. The effect of reducing the preparation cost, large specific surface area, and high hydrazine decomposition efficiency

Inactive Publication Date: 2009-04-22
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] Various carbon materials are widely used as carriers in various liquid-phase reactions and hydrogen-related reactions, but there are no patents or literature reports on their use as carriers in hydrazine decomposition reactions.

Method used

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  • Use of carbon-supported transitional metal carbides catalyst in hydrazine decomposition reaction
  • Use of carbon-supported transitional metal carbides catalyst in hydrazine decomposition reaction
  • Use of carbon-supported transitional metal carbides catalyst in hydrazine decomposition reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] WC x Preparation of / AC-c catalyst

[0020] Weigh 0.31g, 1.38g, and 2.44g of ammonium metatungstate and dissolve them in 3.0ml of deionized water, impregnate equal volumes of the resulting clear solutions onto 2.0g of activated carbon (AC) carriers, dry at room temperature for 12 hours, and then Dry in an oven at 120°C for 12 hours, and bake at 500°C for 4 hours in a nitrogen atmosphere to obtain WO 3 / AC precursor. WO 3 / AC precursor, in the mixed gas of methane and hydrogen (25% methane content), temperature programming reaction, from room temperature to 450 °C at a rate of 10 °C / min, and then to 850 °C at a rate of 1 °C / min , after being kept at this temperature for 2 hours, cooled to room temperature, the catalyst is marked as WC x / AC-c, the mass loadings of the active components of the prepared catalysts were: 10wt%, 33.3wt%, 55wt%.

Embodiment 2

[0022] W 2 Preparation of C / AC-h catalyst

[0023] The catalyst preparation method is the same as in Example 1, except that the mixed gas of methane and hydrogen in the temperature-programmed reaction process is replaced with pure hydrogen. The catalyst is labeled W 2 C / AC-h, the mass loading of active components is 10wt%, 33.3wt%, 55wt%.

Embodiment 3

[0025] wxya x Preparation of / AC-h catalyst

[0026] Weigh 1.04g ammonium metatungstate and 1.19g nickel nitrate dissolved in 3.0ml deionized water to form a mixed solution (the molar ratio of tungsten and nickel is 1:1), impregnate the obtained clear solution into 2.0g activated carbon ( AC) on the carrier, dried at room temperature for 12 hours, then dried in an oven at 120°C for 12 hours, and calcined at 500°C for 4 hours in a nitrogen atmosphere to obtain WNiO 4 / AC precursor. WNiO 4 / AC precursor, temperature programmed reaction in hydrogen, rising from room temperature to 450°C at a rate of 10°C / min, and then rising to 850°C at a rate of 1°C / min, after keeping at this temperature for 2 hours, Cool to room temperature. The catalyst is labeled WNiC x / AC-h (33.3 wt% active ingredient).

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PUM

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Abstract

The invention relates to a catalyst for hydrazine decomposition reaction, in particular to a hydrazine decomposition catalyst loaded by a charcoal carrier. The active composition is carbide of W, Mo, Ni, Co, Cr, Fe, V, Nb, Ti, Zr and other transition metals. The catalyst has similar hydrazine decomposition performance with traditional Ir/Al2O3 and has good application prospect in various power systems taking liquid hydrazine as fuel and gas generating systems.

Description

technical field [0001] The invention relates to a catalyst for hydrazine decomposition reaction, in particular to the application of a catalyst with a carbon material as a carrier and a single-unit or two-unit transition metal carbide as an active component in the hydrazine decomposition reaction. Background technique [0002] Hydrazine is a stable liquid substance at normal temperature, and thermal decomposition reaction can occur at about 250°C. Under the action of the catalyst, the decomposition reaction can occur at a lower temperature to generate a high-temperature and high-pressure mixed gas of nitrogen, hydrogen and ammonia. For a long time, as a liquid fuel, hydrazine has been widely used in the attitude control system of aerospace vehicles, the emergency power system of aircraft, and the buoyancy devices of sounding balloons, sunken ships or submarines, etc. [0003] Currently the most widely used hydrazine decomposition catalyst is 20-40% Ir / γ-Al developed by Shel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/888B01J21/18
Inventor 张涛孙军郑明远王晓东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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