Method for directly producing hydrogen by catalyzing methane conversion through microwaves

A microwave catalyzed methane, direct technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of unsatisfactory methane conversion rate, hydrogen yield, poor carbon deposition resistance and poor stability of the catalyst and other problems, to achieve the effect of reduced apparent activation energy, high catalytic activity and selectivity, and good stability

Active Publication Date: 2020-04-10
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it is obvious that in the process of direct conversion of methane to hydrogen by microwave catalysis, the conversion rate of methane and the yield of hydrogen are not ideal.
In addition, problems such as poor carbon deposition resistance, easy deactivation, and poor stability of the catalyst need to be solved urgently.

Method used

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  • Method for directly producing hydrogen by catalyzing methane conversion through microwaves
  • Method for directly producing hydrogen by catalyzing methane conversion through microwaves
  • Method for directly producing hydrogen by catalyzing methane conversion through microwaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] γ-Al 2 o 3 Add 80ml of isopropanol, sonicate for 60min to get treated γ-Al 2 o 3 and isopropanol mixture. Under stirring conditions, the ammonium molybdate solution was added dropwise to the above solution, stirred for 10 minutes, and then ultrasonicated for 30 minutes. Stirring in a water bath at 40°C for 8h, the resulting product was dried overnight in a drying oven at 110°C, and then calcined in a muffle furnace at 500°C for 4h to obtain the composite carrier MoO 3 / γ-Al 2 o 3 . Put the above composite carrier into the solution containing 20% ​​CH 4 / H 2 (volume ratio) carbonization in a tube furnace to obtain 10% Mo 2 C / γ-Al 2 o 3 (Mo in the composite carrier 2 The content of C is 10wt%). Take 0.261g nickel nitrate hexahydrate and dissolve it in 10ml water, take 1g Mo 2 C / γ-Al 2 o 3 The composite carrier was placed in 40ml of isopropanol and ultrasonicated for 1h. The above solution was added dropwise to Mo 2 C / γ-Al 2 o 3 complex carrier and isop...

Embodiment 2

[0025] The microwave catalyst obtained according to Example 1 is used to catalyze the direct conversion of methane to hydrogen production, and the specific steps are as follows:

[0026] 1) Take a certain amount of Ni / Mo 2 C / γ-Al 2 o 3 The catalyst is placed in a microwave reactor device, and N 2 The flow rate was 80ml / min and the air was purged for 15min to remove the air in the reactor. Set the microwave power to 300-900W, start the microwave device, set the reaction temperature to 650°C, start the reaction device, and the instrument starts to heat up;

[0027] 2) When the reactor temperature reaches the set temperature, feed methane to start the reaction;

[0028] 3) Take the reacted gas with a gas sampling needle and pass it into an Agilent GC-7890A gas chromatograph for product analysis. Among them, TCD is used as a detector, N 2 As carrier gas, use Hayesep D packed column. Simultaneously record the reaction time and reaction temperature;

[0029] 4) According to ...

Embodiment 3

[0040] The consumption of catalyst is 1g, and catalyst bed temperature is 650 ℃, and reaction gas flow rate is 80ml / min, and reaction pressure is normal pressure, adopts 5%Ni / x%Mo 2 C / γ-Al 2 o 3 Composite nanostructured catalysts, investigating the same active components, different Mo 2 The effect of C loading on microwave catalytic methane conversion to hydrogen is shown in Table 3 for details.

[0041] table 3

[0042]

[0043] It can be seen from Table 3 that under microwave irradiation conditions, 5%Ni / x%Mo 2 C / γ-Al 2 o 3 Composite nanostructured catalysts for microwave-catalyzed methane reactions with 5% Ni / 10% Mo 2 C / γ-Al 2 o 3 The catalyst has the best effect, the methane conversion rate is 54.17%, and the hydrogen content in the product is 80.22%.

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Abstract

The intention provides a method for directly producing hydrogen by catalyzing methane conversion through microwaves, and the method comprises the following steps of: directly catalyzing methane conversion to generate hydrogen under the action of microwaves by using a composite nano-structure catalyst which is Ni/Mo2C/gamma-Al2O3; the preparation method of the composite nano-structure catalyst comprises the following steps: firstly, loading Mo2C on gamma-Al2O3 by adopting an impregnation method to obtain a composite carrier with one or more layers of Mo2C films flatly laid on the gamma-Al2O3, and then loading an active component Ni on Mo2C/gamma-Al2O3 by adopting a urea precipitation method to obtain the composite nano-structure catalyst. The catalyst can be prepared. The problem of poor activity of the nickel-based supported catalyst under the existing microwave condition is solved. The problems that an existing microwave catalyst is poor in carbon deposition resistance, prone to inactivation, poor in stability and the like are solved to a certain extent.

Description

technical field [0001] The invention relates to the field of catalytic reaction, in particular to a method for directly producing hydrogen by microwave catalytic methane conversion. Background technique [0002] With the development of unconventional natural gas extraction technology, the United States took the lead in the shale gas revolution, which led to a substantial increase in natural gas production, improved the energy structure of the United States, and reduced the energy pressure on the United States. Although the exploitation of unconventional natural gas in my country started relatively late, it has developed rapidly in recent years, represented by Fuling shale gas. In 2020, the Fuling shale gas field will add 100 billion cubic meters of proven reserves, and its output will reach 7 billion square meters. These developments have brought heightened attention to the use of natural gas. The vast majority of natural gas is used for combustion, and it is difficult to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/26B01J27/22B01J37/02B01J37/025B01J37/03
CPCB01J27/22B01J37/0234B01J37/035C01B3/26C01B2203/0277C01B2203/0855C01B2203/1058C01B2203/1082C01B2203/1241
Inventor 周继承王婕余柳丽邓洁周念
Owner XIANGTAN UNIV
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