Method for coating cordierite honeycomb
A cordierite honeycomb and coating technology, applied in the field of material manufacturing, can solve the problems of full utilization of unfavorable coating inner surfaces, irregularities, and rapid diffusion of unfavorable fluids, etc.
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Embodiment 1
[0060] Preparation of Coated Honeycomb 1
[0061] Take a commercially available cordierite honeycomb body with a pore density of 300cpsi, a size of φ100mm×150mm, and a density of 0.6g / ml, soak it in 2000ml of 1.0wt% nickel nitrate aqueous solution for 2 hours, take it out, dry it in the air, and bake it at 120°C Dry. Then, the obtained honeycomb sample was loaded into a carbon nanofiber growth furnace, and a carbon-containing gas source of ethylene was introduced to carry out catalytic growth at 600° C. for 1 h. Cool in an inert atmosphere after growth. The analysis shows that the weight of the grown carbon nanofiber accounts for 1.5% of the weight of the blank cordierite honeycomb body, and the average diameter of the carbon nanofiber is 30nm. Next, prepare a solid content of 35% containing active Al 2 o 3Then soak the cordierite honeycomb carrier with carbon nanofibers in the above slurry for 30 minutes, blow off the excess slurry in the honeycomb sample with an air gun ...
Embodiment 2
[0063] Preparation of Coated Honeycomb 2
[0064] The preparation steps for the growth of carbon nanofibers are the same as in Example 1, but the concentration of the nickel nitrate aqueous solution is adjusted to 0.5 wt%, and the growth time of the carbon nanofibers is adjusted to 3 hours, while other conditions remain unchanged. The weight of the grown carbon nanofiber accounts for 2.5% of the weight of the blank cordierite honeycomb body, and the average diameter of the carbon nanofiber is 15 nm. Then the cordierite honeycomb support with carbon nanofibers grown in the active Al 2 o 3 In the mixed slurry with a solid content of 25%, the time is 10 minutes. After taking it out, use an air gun to blow off the excess slurry in the honeycomb sample, and then dry it in an oven at 120°C for 12 hours. The obtained honeycomb sample was placed in the air atmosphere of the muffle furnace, and was roasted according to the temperature program at a rate of 5 °C / min, and was stabilized...
Embodiment 3
[0066] Preparation of Coated Honeycomb 3
[0067] The preparation steps for the growth of carbon nanofibers are the same as in Example 1, but the metal salt solution is adjusted to ferric nitrate ethanol solution, the concentration is 2.0wt%, and the soaking time is 0.5h. At the same time, the carbon-containing gas source used for the growth of carbon nanofibers is adjusted to be carbon monoxide, and the growth time is 1h. , with other conditions unchanged. The weight of the grown carbon nanofiber accounts for 3.5% of the weight of the blank cordierite honeycomb body, and the average diameter of the carbon nanofiber is 55 nm. Then the cordierite honeycomb support with carbon nanofibers grown in the active Al 2 o 3 In the mixed slurry with a solid content of 45%, the time is 60 minutes. After taking it out, use an air gun to blow off the excess slurry in the honeycomb sample, and then dry it in an oven at 120°C for 12 hours. The obtained honeycomb sample was placed in the ai...
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