Metal oxide-vanadate/TiO2 catalyst and preparation method and application thereof
A technology of oxides and vanadates, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems restricting the application of catalysts, and achieve excellent resistance to H2O and anti-SO2 poisoning performance, high-efficiency removal, and simple preparation process
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Embodiment 1
[0058] 1. In the presence of oxalic acid, mix cerium nitrate and 0.0425g ammonium metavanadate so that the molar ratio of Ce to V is 0.5;
[0059] 2. Add 5g of TiO to the mixed solution obtained in step 1 2 -WO 3 Carrier, stirred and impregnated at 75°C for 5h, while evaporating to remove water;
[0060] 3. Dry the slurry obtained in step 2 at 110°C for 3 hours;
[0061] 4. In an air atmosphere, the intermediate obtained in step 3 was first calcined at 120°C for 1h, then at 300°C for 1h, and then at 500°C for 3h to obtain V 2 o 5 -CeVO 4 / TiO 2 catalyst.
[0062] The results show that the catalyst of this example makes NO x The conversion rate reaches 89.87~97.52%, Hg 0 The oxidation efficiency reaches 73.65~98.61%.
[0063] Moreover, the conversion rate and oxidation efficiency of the catalyst in this embodiment were both maintained above 96-98% of the original level after 12 hours of continuous experimentation.
Embodiment 2
[0073] 1. In the presence of oxalic acid, mix lanthanum nitrate and 0.0425g ammonium metavanadate so that the molar ratio of La to V is 2;
[0074] 2. Add 5g of TiO to the mixed solution obtained in step 1 2 -WO 3 Carrier, stirred and impregnated at 180°C for 1 hour, and evaporated to remove water at the same time;
[0075] 3. Dry the slurry obtained in step 2 at 80°C for 24 hours;
[0076] 4. In an air atmosphere, the intermediate obtained in step 3 was first calcined at 140°C for 0.5h, then at 280°C for 1.5h, and then at 550°C for 2.5h to obtain La 2 o 3 -LaVO 4 / TiO 2 catalyst.
[0077] The results show that the catalyst of this example makes NO x The conversion rate reaches 85.3~97.6%, Hg 0 The oxidation efficiency reaches 72.64~90.35%.
[0078] In addition, the conversion rate and oxidation efficiency of the catalyst in this example were both maintained above 93-95% of the original level after 12 hours of continuous experimentation.
Embodiment 3
[0085] 1. In the presence of oxalic acid, mix cobalt nitrate and 0.0425g ammonium metavanadate so that the molar ratio of Co to V is 2.4;
[0086] 2. Add 5g of TiO to the mixed solution obtained in step 1 2 -WO 3 Carrier, stirred and impregnated at 150°C for 3h, while evaporating to remove water;
[0087] 3. Dry the slurry obtained in step 2 at 110°C for 3 hours;
[0088] 4. In an air atmosphere, the intermediate obtained in step 3 was first calcined at 100°C for 2h, then at 340°C for 1h, and then at 520°C for 2.5h to obtain Co 2 o 3 -CoVO 4 / TiO 2 catalyst.
[0089] The results show that the catalyst of this example makes NO x The conversion rate reaches 84.02~98.73%, Hg 0 The oxidation efficiency reaches 74.03~95.48%.
[0090] Moreover, the conversion rate and oxidation efficiency of the catalyst in this embodiment were both maintained above 95-97% of the original level after 12 hours of continuous experimentation.
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Abstract
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