Method for in-situ preparing three-effect catalyst by sol-gel method on honeycomb ceramic carrier
A honeycomb ceramic carrier and three-way catalyst technology, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of uneven composition of coating powder and uniform mixing of refractory oxide powder, etc. Achieve high specific surface area, reduce production energy consumption, and improve high temperature resistance
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Embodiment 1
[0029] Get 65.13g cerous nitrate, 48.18g zirconium oxynitrate and 4.15g lanthanum nitrate and dissolve in 100g water, wherein the molar concentration ratio Ce: Zr: La=125: 125: 8, add 252.2g citric acid, polyethylene glycol 2.52g , stir well until the citric acid is completely dissolved, add 44.13g γ-Al 2 o 3 , stirring vigorously to make γ-Al 2 o 3 Uniformly dispersed in solution to form a suspension. Continue heating and stirring the suspension at 150°C until the solution changes color to form a light yellow sol, stop heating and stirring when the sol no longer emits yellow-brown gas, and obtain a viscous wet gel. After the wet gel cools down, add 20g Water was used to adjust the wet gel viscosity to 250 mPa s. Immerse the cordierite honeycomb ceramic carrier (400 mesh, 0.03L) in the wet gel and pull it repeatedly 3 times, blow out the deposited wet gel in the channel with high-pressure gas, then dry the obtained carrier at 150°C for 2h, and then dry it at 450°C Roastin...
Embodiment 2
[0031] Get 87.64g cerium ammonium nitrate, 29.48g zirconium nitrate, 4.51g gadolinium nitrate and 1.92g yttrium nitrate to be dissolved in 100g water, wherein molar concentration ratio Ce: Zr: Ga: Y=30: 15: 2: 1, add citric acid 252.2 g, polyethylene glycol 2.52g, stir well until the citric acid is completely dissolved, add 44.13g γ-Al 2 o 3 , stirring vigorously to make γ-Al 2 o 3 Uniformly dispersed in solution to form a suspension. Continue heating and stirring the suspension at 150°C until the solution changes color to form a light yellow sol, stop heating and stirring when the sol no longer emits yellow-brown gas, and obtain a viscous wet gel. After the wet gel cools down, add 20g Water was used to adjust the wet gel viscosity to 250 mPa s. The mullite honeycomb ceramic carrier (400 mesh, 0.03L) was pulled repeatedly in the wet gel, and the wet gel accumulated in the pores was blown out with high-pressure gas, and then the obtained carrier was dried at 150°C for 2 hou...
Embodiment 3
[0033] The 1#f catalyst of gained among the embodiment 1 is cut into the small sample that size is 9mm * 9mm * 48mm (length along channel direction is 48mm), it is placed in the tube furnace, feeds the air that contains steam 10% at 1050 ℃ for 10 h, after furnace cooling, the aging sample of 1#f (Example 1) catalyst was obtained, which was marked as 1#a.
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