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Method for preparing carbon dioxide methanation reaction catalyst from coal or biomass and application

A carbon dioxide and biomass technology, applied in the field of coal chemical industry or energy conversion and processing, to achieve the effect of improving activity, promoting light weight and low price

Pending Publication Date: 2021-08-13
NORTHWEST UNIV(CN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the energy resource structure of "poor oil, little gas, and relatively rich coal" has made my country's dependence on foreign oil more than 70%, and natural gas 43%, which has brought huge challenges and hidden dangers to energy security.

Method used

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  • Method for preparing carbon dioxide methanation reaction catalyst from coal or biomass and application
  • Method for preparing carbon dioxide methanation reaction catalyst from coal or biomass and application
  • Method for preparing carbon dioxide methanation reaction catalyst from coal or biomass and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Pretreatment of raw materials: Shendong coal is selected as raw material, and after pre-drying, it is crushed into small particles with a particle size of 50-300 μm.

[0040] Step 2. Introduction of metal components: Weigh the small particles of Shendong coal and nickel nitrate reagent pretreated in step 1 according to the mass ratio of Shendong coal to elemental nickel of 20:1, and place them in the pre-prepared water -Ethanol (the volume ratio of the two is 5:1) organic matter-water solution is stirred and mixed, after drying at 110°C, under the protection of nitrogen atmosphere, it is respectively heated at 400°C, 500°C, 550°C, 600°C, 650°C and 700°C After 60 minutes of pyrolysis, pyrolysis gas, coal tar, and nickel-loaded pyrolysis semi-coke crude products are produced.

[0041]Step 3, activation treatment: place the pyrolysis semi-coke crude product loaded with nickel in step 2 into a pre-prepared acidic potassium permanganate solution (2mol / L hydrochloric ...

Embodiment 2

[0044] Replace the organic matter-aqueous solution in step 2 of Example 1 with water-acetone (the volume ratio of the two is 5:2) solution, replace the pyrolysis atmosphere nitrogen with hydrogen, replace the pyrolysis temperature with 500°C, and replace the heat treatment time with 30 minutes respectively , 60 minutes, 90 minutes, 120 minutes, 150 minutes, 200 minutes and 240 minutes can also produce pyrolysis gas, coal tar, and nickel-loaded pyrolysis semi-coke crude products. The obtained catalyst was in CO 2 The reaction result in the methanation reaction is that the conversion rate of carbon dioxide can reach 44%-100%, see Fig. 2(a); the initial methane yield can reach 63%-80%, see Fig. 2(b).

Embodiment 3

[0046] The mass ratio of Shendong coal and elemental nickel in Step 2 of Example 2 is replaced by 1:1, 5:1, 10:1, 20:1 or 50:1 respectively, and the organic matter-aqueous solution is replaced by water-ether-epoxy Propane (the volume ratio of the three is 5:1:1) solution, the pyrolysis atmosphere is replaced by a mixture of hydrogen and methane (volume ratio 2:1), and the heat treatment time is replaced by 60 minutes, which can also produce pyrolysis gas and coal tar , Nickel-loaded pyrolysis semi-coke crude product. The obtained catalyst was in CO 2 The reaction result in the methanation reaction is that the conversion rate of carbon dioxide can reach 60%-95%, see Figure 3(a); the initial methane yield can reach 27%-76%, see Figure 3(b).

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Abstract

The invention provides a method for preparing a carbon dioxide methanation reaction catalyst from coal or biomass and application. Metal salt is introduced in the coal or biomass pyrolysis process, oxygen-containing functional groups on the surface of coal or biomass are used as metal ion anchoring (the dispersity of metal in a target catalyst can be improved) and pyrolysis reaction conditions, and co-production of pyrolytic gas, tar and a metal-loaded pyrolytic semi-coke crude product is achieved; and the metal-loaded pyrolytic semi-coke crude product is further activated to prepare the CO2 methanation reaction catalyst with high catalytic activity and stability. According to the strategy, a precursor (namely a metal-loaded pyrolytic semi-coke crude product) of the catalyst is synthesized in situ by utilizing coal or biomass pyrolysis, and effective coupling of three operation units, namely coal or biomass pyrolysis, catalyst preparation and CO2 methanation reaction is realized. The catalyst is simple in design, low in investment cost and convenient for large-scale production and application.

Description

technical field [0001] The invention belongs to the field of coal chemical industry or energy conversion processing, and in particular relates to a method and application of a carbon dioxide methanation reaction catalyst prepared by using coal or biomass. Background technique [0002] As the use of fossil fuels continues to increase, the cumulative concentration of carbon dioxide emitted into the atmosphere continues to increase. This phenomenon destroys the carbon balance and triggers a series of ecological and environmental problems (such as the greenhouse effect). Therefore, carbon dioxide emission reduction and conversion utilization has become a hot issue of global concern and research. [0003] At present, the energy resource structure of "poor oil, little gas, and relatively rich coal" has made my country's dependence on foreign oil more than 70%, and natural gas 43%, which has brought huge challenges and hidden dangers to energy security. Under the guidance of the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/745B01J23/83B01J37/00B01J37/08C07C1/12C07C9/04
CPCB01J23/755B01J23/745B01J23/83B01J23/002B01J37/082B01J37/088B01J37/0009C07C1/12C07C2523/755C07C2523/745C07C2523/83C07C9/04
Inventor 张建波杨文成周娅兰杨恩李润马晓迅
Owner NORTHWEST UNIV(CN)