Denitrifying catalyst with selective catalytic reduction and a preparation method
A denitrification catalyst and selective technology, applied in the preparation field of catalyst technology, can solve the problems of low reaction activity, high price, low conversion temperature, etc.
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Embodiment 1
[0027] Step 1: Weigh 36.8g of aluminum nitrate solid and dissolve it in 200mL of deionized water; then add 2.2mL of 0.5mol / L zirconium nitrate solution dropwise to the aluminum nitrate solution, keep stirring until the mixture is even, then weigh 20.2g of 25% ammonia water and diluted to 200mL of ammonia solution, the ammonia solution was slowly added to the aforementioned mixed solution for precipitation.
[0028] Place the mixed solution at room temperature for precipitation for 1 hour, then filter and wash in turn until the pH value is 7; dry the filtered cake at 110°C for 1 hour, and finally place the filter cake at 500°C Roasting 3h makes catalyst carrier 5g;
[0029] The second step is to prepare palladium nitrate solution and silver nitrate solution with a concentration of 0.5mol / L respectively, take 0.5mL palladium nitrate solution, 0.9mL silver nitrate solution and 3.6mL deionized water, mix them, and let them stand until they are evenly mixed to make a catalyst dipp...
Embodiment 2
[0037] Using the same method steps as in Example 1, the amount of 0.5mol / L palladium nitrate solution was changed to 0.25mL, and finally the components and mass percentages in the finished selective catalytic reduction denitration catalyst prepared by the method described in this example were respectively For: 2.5% ZrO 2 , 1% Ag, 0.5% Pd and 96% Al 2 o 3 . Evaluate under the test condition identical with embodiment 1, the conversion rate of NO on the finished product of selective catalytic reduction denitration catalyst such as table 2 different temperatures of evaluation result:
[0038] Table 2
[0039] Reaction temperature (°C)
Embodiment 3
[0041] Adopt the method step identical with embodiment 1, change the consumption of 0.5mol / L palladium nitrate solution into 1mL, finally the component and mass percent in the selective catalytic reduction denitrification catalyst finished product prepared by the method described in this embodiment are respectively : 2.5% ZrO 2 , 1% Ag, 2% Pd and 94.5% Al 2 o3 . Evaluate under the test condition identical with embodiment 1, the conversion rate of NO on the finished product of selective catalytic reduction denitration catalyst under the different temperatures of table 3 as evaluation result:
[0042] table 3
[0043] Reaction temperature (°C)
[0044] With reference to embodiment 4:
[0045] In order to investigate the promoting effect played by Ag in the catalyst, no silver nitrate component was added in Example 1, and the final ZrO 2 , Ag and Pd respectively accounted for 2.5%, 0 and 0.5% of the total amount of the catalyst. Other preparation conditions are the...
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