CeO2-ZrO2 based SCR (selective catalytic reduction) catalyst used for denitration and preparation thereof
An SCR catalyst and a catalyst technology, which are applied in the field of nitrogen oxide post-treatment and purification, can solve the problems of poor high temperature resistance, environmental and human harm, and toxicity of the catalyst, and achieve the effects of low production cost, easy industrialization, and simple preparation process.
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Embodiment 1
[0033] Take a certain amount of cerium-zirconium powder (the molar ratio of Ce to Zr is 3:1), zirconium acetate and water in a mass ratio of 40:10:50 and mix at a stirring speed of 500 rpm to prepare slurry A. Soak the 200-mesh cordierite honeycomb ceramic carrier in the solution for 10 seconds, blow out the excess solution in the channels with high-pressure gas to ensure the penetration of the honeycomb channels, and then dry the carrier at 150°C for 1 hour; repeat the above steps 3 times to obtain the loaded active component Carrier B is cerium-zirconium powder, and carrier B is calcined at 500°C for 1 hour to obtain carrier C whose active component is cerium-zirconium solid solution active coating. The loading capacity of cerium-zirconium solid solution is 100g / L, and the carrier The water absorption rate is 25wt%. Configure the required niobium oxalate (C 12 h 7 NbO 24 ) salt solution, and this solution adopts equal volume impregnation method to load Nb on the surface o...
Embodiment 2
[0037] Preparation conditions and preparation procedures are the same as Example 1, adjust Nb 2 o 5 The catalyst is prepared as 10% of the total mass of active coating + modified coating, and this SCR catalyst is marked as Nb10ZrCZ-f.
[0038] The obtained catalyst has a three-layer structure. The cordierite honeycomb ceramic is used as a carrier, an active coating is loaded on the carrier, a modified coating is loaded on the active coating, and the active coating uses cerium-zirconium solid solution as an active group. points, the modified coating is Nb 2 o 5 oxide layer.
[0039] The catalyst can be represented by the following formula, Nb 2 o 5 -ZrO 2 -Ce 0.75 Zr 0.25 o 2 , where ZrO 2 Indicates the binder used in the active coating. In the catalyst, the mass of cerium-zirconium solid solution accounts for 82.3% of the total mass of the active coating and the modified coating. ZrO 2 The mass accounts for 7.7% of the total mass of active coating and modified coati...
Embodiment 3
[0041] Preparation conditions and preparation procedures are the same as Example 1, adjust Nb 2 o 5 A catalyst was prepared for 5% of the total mass of active coating + modified coating, and this SCR catalyst was labeled as Nb5ZrCZ-f.
[0042] The obtained catalyst has a three-layer structure. The cordierite honeycomb ceramic is used as a carrier, an active coating is loaded on the carrier, a modified coating is loaded on the active coating, and the active coating uses cerium-zirconium solid solution as an active group. points, the modified coating is Nb 2 o 5 oxide layer.
[0043] The catalyst can be represented by the following formula, Nb 2 o 5 -ZrO 2 -Ce 0.75 Zr 0.25 o 2 , where ZrO 2 Indicates the binder used in the active coating. In the catalyst, the mass of cerium-zirconium solid solution accounts for 86.8% of the total mass of the active coating and the modified coating. ZrO 2 The mass accounts for 8.2% of the total mass of active coating and modified coati...
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