Carbon dioxide methanation catalyst and preparation method thereof
A technology for methanation catalyst and carbon dioxide, applied in the field of nickel-based carbon dioxide methanation catalyst and preparation thereof, can solve the problems of many by-products, no report on methanation catalyst, etc., and achieves mild process conditions, low cost and wide application range. Effect
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[0022] Example 1:
[0023] 1) Ni-Mg / SiO 2 Catalyst preparation
[0024] Weigh 5.8635g nickel nitrate hexahydrate and 0.4161g magnesium nitrate hexahydrate in a beaker, add water to dissolve and dilute to a 50ml volumetric flask to obtain a nickel-magnesium mixed solution. Weigh 3.0g SiO 2 Put the aerogel carrier in a clean evaporating dish, pipette 22.5ml of the mixed solution of nickel and magnesium into the beaker, then pour it into the evaporating dish at one time to soak the carrier, stir quickly for 0.5h, and then let it stand for half an hour. Put it in a blast oven and dry at 100℃ for 3h and 160℃ for 3h, then put it into a muffle furnace and roast it at 500℃ under flowing air atmosphere for 5h to decompose the salt. 2 Reducing treatment at 400℃ in the flow for 3h, after being cooled to room temperature, oxygen passivation to obtain 15%Ni-0.5%Mg / SiO 2 catalyst. After tableting and sieving, particles with a particle size of 40-60 meshes are taken for later use.
[0025] 2) Eva...
Example Embodiment
[0027] Example 2:
[0028] Weigh 5.8984g nickel nitrate hexahydrate and 0.8371g magnesium nitrate hexahydrate, imitate the catalyst preparation method of Example 1, to obtain 15% Ni-1% Mg / SiO 2 Catalyst for CO 2 Evaluation of methanation activity. CO at 400℃ 2 The conversion rate reached the maximum, 91.7%, at this time CH 4 The selectivity is 99.9%.
Example Embodiment
[0029] Example 3
[0030] Weigh 6.3522g nickel nitrate hexahydrate and 6.3105g magnesium nitrate hexahydrate, imitate the catalyst preparation method of Example 1, to obtain 15%Ni-7%Mg / SiO 2 Catalyst for CO 2 Evaluation of methanation activity. CO at 440℃ 2 The conversion rate reached the maximum at 62.8%, at this time CH 4 The selectivity is 99.0%.
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