High temperature-resisting active coating and preparation method thereof
An active coating, high temperature resistant technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. problems such as low rate, to achieve the effect of simple method, easy operation and good heat resistance stability
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[0030] Example 1
[0031] (1) Take 5.0 grams of pseudo-boehmite and 44 grams of γ-Al 2 O 3 , 44 grams of Ce-Zr composite oxide, 1.25 grams of PEG6000, add 100 grams of deionized water and mix evenly;
[0032] (2) Take 8.4 grams of cerium nitrate, 0.35 grams of lanthanum nitrate, 5 grams of 7% polyvinyl alcohol aqueous solution, 2.0 grams of urea, and 50 grams of deionized water to dissolve and mix;
[0033] Mix the above two coating liquids and stir evenly at high speed, and slowly add 20.0 grams of SiO 2 The silica sol with a mass percentage of 22% and an average particle size of 15nm is moved to a ball milling tank and ball milled at a frequency of 30 Hz for 16 hours to obtain a slurry, and then HNO is added 3 Adjust the pH of the slurry to 3.5.
[0034] (3) Immerse the blank honeycomb ceramic carrier in the coating slurry for 2 minutes, take it out and purge with compressed air to remove the excess slurry in the pores, then dry at 50°C for 2 hours, 120°C for 2 hours, and 600°C for 3...
Example Embodiment
[0035] Example 2
[0036] (1) Take 6.0 grams of pseudo-boehmite and 44 grams of γ-Al 2 O 3 , 44 grams of Ce-Zr-Al composite oxide, 2.0 grams of PEG8000, add 100 grams of deionized water and mix evenly;
[0037] (2) Take 8.0 grams of cerium nitrate, 0.40 grams of lanthanum nitrate, 0.40 grams of praseodymium nitrate, and add 50 grams of deionized water to dissolve and mix;
[0038] Mix the above two coating liquids and stir evenly at high speed, and slowly add 20.0 grams of SiO 2 The silica sol with a mass percentage of 21% and an average particle size of 17nm is moved to a ball mill tank and ball milled at a frequency of 30 Hz for 16 hours to obtain a slurry, and then HNO is added 3 Adjust the pH of the slurry to 3.7.
[0039] (3) Immerse the blank honeycomb ceramic carrier in the coating slurry for 2 minutes, take it out and purge with compressed air to remove the excess slurry in the pores, then dry at 60°C for 2 hours, 110°C for 4 hours, and 600°C for 3 hours to obtain. The product...
Example Embodiment
[0040] Example 3
[0041] (1) Take 6.0 grams of pseudo-boehmite and 44 grams of γ-Al 2 O 3 , 44 grams of Ce-Zr-Pr composite oxide, 1.5 grams of PEG5000, add 100 grams of deionized water and mix evenly;
[0042] (2) Take 8.4 grams of cerium nitrate, 0.35 grams of lanthanum nitrate, 4.5 grams of 7% polyvinyl alcohol aqueous solution, 2.0 grams of urea, and 50 grams of deionized water to dissolve and mix;
[0043] Mix the above two coating liquids and stir evenly at high speed, and slowly add 20.0 grams of SiO 2 The silica sol with a mass percentage of 22% and an average particle size of 15nm is moved to a ball milling tank and ball milled at a frequency of 30 Hz for 16 hours to obtain a slurry, and then HNO is added 3 Adjust the pH of the slurry to 3.6.
[0044] (3) Immerse the blank honeycomb ceramic carrier in the coating slurry for 2 minutes, take it out and purge with compressed air to remove the excess slurry in the pores, then dry at 60°C for 4 hours, 110°C for 2 hours, and 700°C f...
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