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A kind of method that uses activated carbon as catalyst to catalyze methane cracking to produce hydrogen

A catalyst and activated carbon technology, which is applied in the field of methane cracking hydrogen production, can solve the problems of high initial catalytic activity, influence on popularization and use, and low catalytic efficiency, and achieve the effects of improving conversion efficiency, low production cost, and prolonging deactivation time

Active Publication Date: 2022-02-15
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon catalyst is one of the most common carbon-based catalysts. Its initial catalytic activity is high, but its deactivation is rapid, and its catalytic efficiency is low after deactivation, which affects its popularization and use.

Method used

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  • A kind of method that uses activated carbon as catalyst to catalyze methane cracking to produce hydrogen
  • A kind of method that uses activated carbon as catalyst to catalyze methane cracking to produce hydrogen
  • A kind of method that uses activated carbon as catalyst to catalyze methane cracking to produce hydrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take an appropriate amount of 8-16 mesh coconut shell activated carbon catalyst, in N 2 Calcined at 900°C for 3 hours in the atmosphere to remove the ash and volatile matter contained in the activated carbon, and then activated in N 2 Natural cooling down to room temperature under the atmosphere, set aside.

[0022] Take 2g of activated coconut shell activated carbon, fill it evenly in a quartz tube with an inner diameter of 20mm, fix it with quartz wool on both sides, and then place it in a gas-solid-phase catalytic fixed-bed reactor at normal pressure. Leak, feed nitrogen, the space velocity is 20ml / min g, the heating rate is 30°C / min, when the temperature is raised to the cracking temperature of 900±5°C, the nitrogen is turned off, and the methane gas is switched to methane catalytic cracking to produce hydrogen. Introduce hydrogen sulfide gas with a concentration of 200ppm; adjust the mass flow meter so that the methane flow rate is constant at 40ml / min, that is, t...

Embodiment 2

[0026] The methane catalytic cracking process is basically the same as in Example 1, except that the concentration of hydrogen sulfide gas introduced is 100ppm. The change curve of methane conversion rate of methane catalytic cracking hydrogen production with time is as follows figure 1 shown.

Embodiment 3

[0028] The methane catalytic cracking process is basically the same as in Example 1, except that the concentration of hydrogen sulfide gas introduced is 300ppm. The change curve of methane conversion rate of methane catalytic cracking hydrogen production with time is as follows figure 1 shown.

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Abstract

The invention discloses a method for producing hydrogen by using activated carbon as a catalyst to catalyze methane cracking. The method adopts a gas-solid phase catalytic reaction fixed-bed reactor, uses methane as a raw material, adds a small amount of hydrogen sulfide, and uses activated carbon as a catalyst. React at 950°C under normal pressure to obtain hydrogen and carbon as products, in which the concentration of hydrogen sulfide is 100ppm-300ppm. The invention adds a trace amount of hydrogen sulfide to the methane raw material gas, improves the activity of the activated carbon to catalyze the cracking of methane to produce hydrogen, prolongs the deactivation time of the activated carbon catalyst, and has important industrial application value for improving the conversion efficiency of the activated carbon to catalyze the cracking of methane to produce hydrogen.

Description

technical field [0001] The invention relates to the technical field of methane cracking hydrogen production, in particular to a method for catalytic methane cracking hydrogen production using activated carbon as a catalyst. Background technique [0002] The direct cracking of methane to produce hydrogen is a clean hydrogen production process. Methane is decomposed into hydrogen and carbon by high temperature. This process does not produce CO 2 , is a transitional process connecting fossil fuels and renewable energy. The methane cracking reaction is an endothermic reaction, and the energy consumed to generate hydrogen is 37.8kJ / mol. The C-H in the methane molecule is very stable, and the cracking rate of the non-catalytic methane cracking reaction is very low below 1000°C, while the catalytic cracking can greatly reduce the reaction rate. temperature to increase the hydrogen yield. [0003] At present, the research focus of hydrogen production from methane cracking mainly f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/26C01B32/05C01B32/162D01F9/127
CPCC01B3/26C01B32/05C01B32/162D01F9/1272C01B2203/0277C01B2203/1041C01B2203/1241
Inventor 刘方宣国会杨丽
Owner CHINA UNIV OF MINING & TECH
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