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An ammonia decomposition and catalyst technology is applied in the field of ammonia decomposition catalysis to achieve the effects of reducing stacking degree, improving catalytic performance and stability, and shortening crystallization time
Pending Publication Date: 2021-07-30
XIAMEN UNIV
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[0041] The invention provides a method for preparing an ammonia decomposition catalyst activated at low temperature, which specifically comprises the following steps:
[0042] (1) Add nickel-containing carbon materials, silicon sources, aluminum sources, organic templates, inorganic bases, and solvents into the reactor in proportion, and continuously stir to obtain a gel, which is aged for later use;
[0043] (2) Transfer the gel obtained in step (1) to a hydrothermal reactor for crystallization to obtain a crystallized product;
[0044] (3) filtering and washing the crystallized product obtained in step (2), drying and roasting to obtain Ni-FER molecular sieve;
[0045] (4) placing the Ni-FER molecular sieve obtained in step (3) in an ammonium salt solution for ammonium ion exchange, drying after the exchange, and then roasting to obtain the Ni-HFER molecular sieve.
[0046] The preparation process of the above-mentioned nickel-containing carbon material is as follows:
[0...
Embodiment 1
[0050] (1) Pretreatment of carbon materials: put 5g of carbon nanotubes in 50mL of 1mol / L nitric acid, reflux at 65°C for 6h, dry at 110°C, and grind to above 120 mesh;
[0051] (2) Synthesis of nickel-containing carbon materials: 1 g of pretreated carbon nanotubes was placed in 10 mL, 0.2 mol / L Ni(NO 3 ) 2 solution, fully soaked and dried at 65°C for 24 hours, then roasted in a nitrogen atmosphere, using a temperature-programmed roasting process, the specific roasting conditions are: heating rate 5°C / min, roasting temperature 550°C, holding time 6h, to obtain Ni-CNT with 10% Ni loading;
[0052] (3) Synthesis of molecular sieve precursors: at room temperature, add 0.2g sodium hydroxide, 0.8g sodium metaaluminate, and 30ml deionized water into a 50mL beaker and stir until the solution is clear; then add 0.1g Ni-CNT, and sonicate for 2h Finally, first dropwise add 15g of alkaline silica sol (30wt.%), continue to stir for 1h until it becomes a uniform sol, then dropwise add 5m...
Embodiment 2
[0058] The difference between this embodiment 2 and embodiment 1 is that the CNT is replaced by graphene of equal mass, and other preparation processes are the same as in embodiment 1.
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Abstract
The invention provides a low-temperature activation efficient ammonia decomposition catalyst and a preparation method thereof, and belongs to the field of ammonia decomposition catalysis. The catalyst is a nickel-containing FER molecular sieve; according to the molecular sieve, a nickel-containing carbon material is taken as a nickel source and a hard template agent, and metal nickel is introduced into the FER molecular sieve in situ; and the content of nickel in the nickel-containing molecular sieve is 0.1-5wt.% in terms of nickel element. the invention also provides a preparation method of the catalyst. The method specifically comprises the following steps of: adding a nickel-containing carbon material, a silicon source, an aluminum source, an organic template agent, inorganic base and a solvent into a reactor according to proportions; continuously stirring the materials to obtain uniform sol, aging the uniform sol; transferring the sol to a hydrothermal reaction kettle for crystallization; performing filtering, washing, drying and roasting on a product which is obtained after the reaction is finished; carrying out hydrogen transformation on an obtained molecular sieve; and finally roasting to obtain the nickel-containing FER molecular sieve. The catalyst disclosed by the invention has the advantages of rich microporous structure, short crystallization time and high catalyst activity and stability; the temperature required by ammonia decomposition is greatly reduced; and the catalyst has huge industrial application potential.
Description
technical field [0001] The invention belongs to the technical field of ammonia decomposition catalysis, and in particular relates to a nickel-containing FER molecular sieve capable of effectively decomposing ammonia into hydrogen and nitrogen at low temperature and a synthesis method thereof. Background technique [0002] Hydrogen energy is the cleanest energy, and its calorific value is much higher than other fuels, so it is one of the most promising alternative energy sources for fossil energy in the future. Since hydrogen has a high calorific value in the combustion process and does not produce COx and NOx emissions, it can be used for fuel cell power generation and fuel cell electric vehicles. However, the volatility and low volume energy density of hydrogen make the production, storage and transportation of hydrogen a huge challenge. The high cost of hydrogen storage and transmission greatly restricts the development of hydrogen energy. For example, Toyota released in 2...
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