Preparation and application of embedded microporous-mesoporous composite molecular sieve methanation catalyst
A molecular sieve methane, mesoporous molecular sieve technology, applied in the direction of molecular sieve catalysts, including molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of low hydrothermal stability, low-temperature catalytic activity needs to be improved, etc., to achieve excellent hydrothermal stability, Cost-effective, excellent high temperature performance
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[0025] The preparation method of the embedded microporous-mesoporous composite molecular sieve methanation catalyst comprises the following steps:
[0026] (1) prepare Ni salt solution;
[0027] (2) Disperse the ZSM-5 microporous molecular sieve in the NaOH solution, add the template agent CTAB, stir vigorously, drop the silicon source TEOS at the same time, add the prepared Ni salt solution dropwise, stir vigorously for a certain period of time, and transfer to water Crystallization in a thermal reactor;
[0028] (3) The raw solution after crystallization is cooled to room temperature, suction-filtered, washed until neutral, vacuum-dried, and roasted to obtain a catalyst, and the Ni loading in the catalyst is 1-10 wt%.
[0029] It is worth noting that the Ni salt is nickel sulfate, nickel chloride, nickel nitrate and nickel acetate; the solvent used in the Ni salt solution is deionized water, ethanol; the hydrothermal synthesis temperature is 80 ~ 150°C, preferably 100-120°...
Embodiment 1
[0032] Embodiment 1: The preparation method of embedded microporous-mesoporous composite molecular sieve methanation catalyst, its steps are: take by weighing 1.6g nickel nitrate hexahydrate and dissolve in 20ml deionized water, configure nickel nitrate aqueous solution; 3.3g ZSM- 5 molecular sieves are dispersed in NaOH solution, the solution is heated to 40°C, a certain amount of template agent (hexadecyltrimethylammonium bromide) is added under vigorous stirring, nickel nitrate aqueous solution and silicon source (tetraethyl orthosilicate) Slowly add to the solution, the pH value of the solution is adjusted to 11, the molar ratio of each substance in the solution is: 1.0ZSM-5: 0.12Ni: 0.12CTAB: 1.0TEOS: 0.2NaOH: 100H 2 O. The mixed solution was vigorously stirred and aged for 2 hours, then moved to a hydrothermal reaction kettle, crystallized at 100°C for 72 hours, cooled rapidly to room temperature, filtered, washed until neutral, dried overnight at 100°C, and calcined at ...
Embodiment 2
[0033] Embodiment 2: The preparation method of embedded microporous-mesoporous composite molecular sieve methanation catalyst, its step is: take by weighing 3.2g nickel nitrate hexahydrate and dissolve in 20ml deionized water, configure nickel nitrate aqueous solution; 3.3g ZSM- 5 molecular sieves are dispersed in NaOH solution, the solution is heated to 40°C, a certain amount of template agent (hexadecyltrimethylammonium bromide) is added under vigorous stirring, nickel nitrate aqueous solution and silicon source (tetraethyl orthosilicate) Slowly add to the solution, the pH value of the solution is adjusted to 11, the molar ratio of each substance in the solution is: 1.0ZSM-5: 0.12Ni: 0.12CTAB: 1.0TEOS: 0.2NaOH: 100H 2 O. The mixed solution was vigorously stirred and aged for 2 hours, then moved to a hydrothermal reaction kettle, crystallized at 100°C for 72 hours, cooled rapidly to room temperature, filtered, washed until neutral, dried overnight at 100°C, and calcined at 55...
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