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Catalyst for preparing hydrogen gas without COx by ammonia decomposition and preparation method thereof

A catalyst and ammonia decomposition technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve problems such as poor stability, high equipment performance, and difficult operation , to achieve the effect of large industrial application significance and high catalytic activity

Inactive Publication Date: 2012-06-13
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, this method has relatively high requirements for equipment performance, and has poor stability, is not easy to operate, and will cause a certain degree of pollution to the environment.

Method used

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  • Catalyst for preparing hydrogen gas without COx by ammonia decomposition and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Weigh 2 g of carbon nanotubes (CNTS, Shenzhen Nanoport Co., Ltd., the same below) and place them in a round bottom flask, add 90 ml of concentrated nitric acid (concentrated nitric acid of analytical purity, the same below), and place in a 120°C oil bath Heat to reflux for 4 hours, then filter and wash with water until the filtrate is neutral, and dry at 100° C. for 6 hours to obtain activated carbon nanotubes.

[0026] (2) Determination of saturated water absorption of carbon nanotubes after activation: take 22.4565 g of the mass of an empty beaker, and weigh 1.0015 g of activated carbon nanotubes therein, then the total mass of the empty beaker and non-immersed carbon nanotubes 23.4580g. Add deionized water dropwise to the beaker containing the carbon nanotubes until the water just completely covers the sample, and let it stand for 4 hours. Use filter paper to carefully absorb the water on the surface of the sample until there are no obvious water droplets on the s...

Embodiment 2

[0041] (1) Weigh 2g of carbon nanotubes into a round bottom flask, add 100ml of concentrated nitric acid, heat and reflux in an oil bath at 140°C for 4h, then filter and wash with water until the filtrate is neutral, dry at 120°C for 12h to obtain activated of carbon nanotubes.

[0042] (2) The saturated water absorption of the activated carbon nanotubes is measured to be 51.0ml / g. Weigh 0.0407gCo(NO 3 ) 2 ·6H 2 O and 0.1378g (NH 4 ) 6 Mo 7 o 24 4H 2 O, dissolved in 51.0ml of distilled water to prepare the dipping solution. Mix this solution with 1.0 g of activated carbon nanotubes evenly, then let stand in the air for 12 hours, dry at 110°C for 12 hours in an air atmosphere, then calcinate at 450°C for 5 hours in a nitrogen atmosphere, and cool to room temperature to obtain the catalyst precursor, where Co 3 o 4 and MoO 3 The mass contents in the catalyst precursor are respectively 1% and 10%.

[0043] (3) Get 0.1g of the calcined product and put it into a quartz...

Embodiment 3

[0046] (1) Weigh 2g of carbon nanotubes into a round bottom flask, add 90ml of concentrated nitric acid, heat and reflux in an oil bath at 120°C for 4h, then filter and wash with water until the filtrate is neutral, and dry at 100°C for 12h to obtain activated of carbon nanotubes.

[0047] (2) The saturated water absorption of the activated carbon nanotubes is measured to be 52.5ml / g. Weigh 0.0824gCo(NO 3 ) 2 ·6H 2 O and 0.1394g (NH 4 ) 6 Mo 7 o 24 4H 2O, dissolved in 52.5ml of distilled water to prepare the dipping solution. Mix this solution with 1.0 g of activated carbon nanotubes evenly, then stand in the air for 12 hours, dry at 110°C for 12 hours in an air atmosphere, then calcinate at 500°C for 3 hours in a nitrogen atmosphere, and cool to room temperature to obtain the catalyst precursor, where Co 3 o 4 and MoO 3 The mass contents in the catalyst precursor are respectively 2% and 10%.

[0048] (3) Get 0.1g of the calcined product and put it into a quartz r...

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Abstract

The invention belongs to the technical field of catalysts and preparation thereof, and discloses a catalyst for preparing hydrogen gas without COx by ammonia decomposition reaction and a preparation method thereof. Co-Mo nitride with noble metal property is used as the main active component of the catalyst, alkali metal, alkali-earth metal, transition metal or rare earth compound is used as an additive of the catalyst, and carbon nanotubes are used as carriers. The catalyst is prepared by the isometric impregnation process and the temperature programed nitridation technology, wherein the nitridation is realized by the nitriding gas which is a mixture of nitrogen gas and hydrogen gas, proportion of nitrogen gas and hydrogen gas is controlled in a staging manner, hydrogen gas dominates in the reduction stage, and the nitrogen gas dominates in the nitriding stage, so that the catalyst prepared by the method has fine reaction activity and stability and is low in cost and simple in preparation process.

Description

technical field [0001] The invention belongs to the technical field of catalysts and their preparation, and relates to catalysts and their preparation methods, in particular to a method for ammonia decomposition to prepare zero CO x Catalyst for hydrogen and method for its preparation. Background technique [0002] The heterogeneous catalytic decomposition and synthesis of ammonia has been one of the most important reactions widely studied. In theory, ammonia decomposition is the reverse reaction of ammonia synthesis and a sub-reaction of hydrazine decomposition. The in-depth study of its efficient catalyst will be of great significance to artificial nitrogen fixation and hydrazine decomposition. [0003] The study of ammonia decomposition is also very necessary in industrial practical applications. Proton exchange membrane fuel cell (PEMFC) uses hydrogen as fuel source, no pollution, no noise, and energy conversion efficiency of 40-60%. However, current hydrogen producti...

Claims

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Application Information

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IPC IPC(8): B01J23/882B01J23/887C01B3/04
CPCY02E60/364Y02E60/36
Inventor 邹汉波赵朝晖林维明
Owner GUANGZHOU UNIVERSITY
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