Methanation catalyst, preparation method thereof and method for using methanation catalyst to prepare methane
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A methanation catalyst and lubricant technology, applied in the field of its preparation, methanation catalyst, and methane preparation, can solve problems such as difficulty in meeting actual needs, energy consumption, and environmental pollution by toxic gases
Active Publication Date: 2019-03-01
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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The hydrotalcite-like methanation catalysts disclosed in the above-mentioned prior art patents require high-temperature calcination to obtain composite oxides containing nickel oxide during the preparation process. The high-temperature calcination process n
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Embodiment 1
[0069] Methanation Catalyst 1 was prepared by the following method:
[0070] Step (1), 1.09g nickel nitrate (5.96mmol), 0.7g aluminum nitrate (3.28mmol) and 0.047g manganese nitrate (0.26mmol) are dissolved in 50mL deionized water, obtain nickel ion concentration and be 119mmol / L, aluminum ion The concentration of solution A is 65.6mmol / L;
[0071] Step (2), 0.6g precipitant urea (10mmol) was dissolved in 40mL deionized water to obtain solution B containing 0.25mol / L precipitant;
[0072] Step (3), mix solution A and solution B obtained in step (1) and step (2) at room temperature, place the mixed solution in a hydrothermal reaction kettle, perform hydrothermal reaction at 100°C for 30h, and the reaction ends After obtaining the crude product;
[0073] Step (4), the crude product obtained in step (3) is taken out and filtered, the filter residue is washed 2 times with deionized water, after drying at 120° C. for 20 h, the lubricant graphite and The weight percentage is the fo...
Embodiment 2
[0075] Methanation Catalyst 2 was prepared by the following method:
[0076] The only difference from Example 1 is that the same molar amount of indium nitrate is used in step (1) instead of manganese nitrate to add to solution A.
[0079] Methanation catalyst 3 was prepared by the following method:
[0080] The only difference from Example 1 is that in step (1), the same molar amount of nickel acetate and aluminum acetate is used instead of nickel nitrate and aluminum nitrate, and the same molar amount of ammonium molybdate is used instead of manganese nitrate to add to solution A.
[0081] Example 3 to obtain the methanation catalyst 3.
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Abstract
The invention provides a methanation catalyst, a preparation method thereof and a method for using the methanation catalyst to prepare methane. The methanation catalyst is obtained by reducing metal hetero-atom doped NiAl hydrotalcite directly, the metal hetero-atom is doped into the NiAl hydrotalcite by replacing a nickel atom in a NiAl hyrotalcite crystal lattice, and the atomic radius ratio ofthe metal hetero-atom to the nickel atom is between 0.75 and 1.6, and the oxidation state is valence +2 and above. The obtained methanation catalyst has high specific surface area, permeability and pore volume, activation temperature is between 220 and 230 DEG C, the conversion rate of CO between 270 and 280 DEG C can reach 100%, the selectivity to CH4 can reach 97%, the product catalytic effect is stable, the service life is long, and the catalytic activity, the stability and the carbon deposition resistance of the methanation catalyst are all apparently superior to an existing commercializedcatalyst.
Description
technical field [0001] The invention relates to the field of chemical catalysts, in particular to a methanation catalyst, a preparation method thereof and a method for preparing methane using the same. Background technique [0002] At present, my country is focusing on the development of coal efficient and clean comprehensive utilization technology, building a clean energy efficient comprehensive utilization process and system integration with coal pyrolysis, gasification, combustion, power generation, and synthesis as the core. Among them, raw coal can be transformed through pyrolysis Pyrolysis gas, tar and semi-coke, pyrolysis gas can be produced by separation or conversion technology 4 and H 2 , tar can be separated and hydrogenated to produce chemicals and oil products, and raw coal can also be gasified to produce syngas (the main components are CO and H 2 ), and then further converted into methane or other chemicals, in addition, the coke oven gas (mainly containing a ...
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