A kind of preparation method of nano palladium oxide
A palladium oxide and nanotechnology, which is applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve the problems of easy introduction of impurity ions, failure to reach the nanometer level, coarse particle size of palladium oxide, etc.
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Embodiment 1
[0022] Take 10g of palladium powder in a 500ml round-bottomed three-neck flask, add 150ml, 55wt% nitric acid solution, heat to 75 degrees in a water bath, and react for 5 hours. The solution was reddish brown, and a small amount of undissolved palladium powder was filtered out. The filtrate was collected in a small rotary evaporating flask, concentrated under reduced pressure until the content of free nitric acid was less than 10 wt%, cooled to 25°C, and added 0.5 g of octylphenol polyoxyethylene ether. Stir evenly and place for 2 hours, dry, and burn at 600-700°C for at least 3 hours to obtain palladium oxide with a yield of 98.2%, a particle size of 20nm, a palladium content of 86±0.5%, a water content of ≤1.0%, and a specific surface area ≥500cm 2 / g, impurity standard: Pt≤0.0010%, Au≤0.0003%, Pb≤0.0010%, Si≤0.0030%, Fe≤0.0010%, Ni≤0.0010%, Al≤0.0010%, Ir≤0.0010%, Cu≤0.0003% , Rh ≤ 0.0010%, Ag ≤ 0.0003%, Sn ≤ 0.0003%, and the hydrogen absorption catalytic effect under the...
Embodiment 2
[0024] Take 10g of palladium powder in a 500ml round-bottomed three-neck flask, add 200ml of nitric acid solution with a concentration of 55wt%, heat it in a water bath to 85 degrees, and react for 5 hours. The solution was reddish brown, and a small amount of undissolved palladium powder was filtered out. The filtrate was collected in a small rotary evaporating flask, concentrated under reduced pressure until the content of free nitric acid was less than 10 wt%, cooled to 25°C, and added 0.5 g nonylphenol polyoxyethylene ether. Stir evenly and place for 2 hours, dry, and burn at 600-700°C for at least 3.5 hours to obtain palladium oxide with a yield of 99%, a particle size of 22nm, a palladium content of 86±0.5%, a water content of ≤1.0%, and a specific surface area of ≥ 500cm 2 / g, impurity standard: Pt≤0.0010%, Au≤0.0003%, Pb≤0.0010%, Si≤0.0030%, Fe≤0.0010%, Ni≤0.0010%, Al≤0.0010%, Ir≤0.0010%, Cu≤0.0003% , Rh ≤ 0.0010%, Ag ≤ 0.0003%, Sn ≤ 0.0003%, and the hydrogen absor...
Embodiment 3
[0026] Take 10g of palladium powder in a 500ml round-bottomed three-neck flask, add 200ml of nitric acid solution with a concentration of 55wt%, heat it in a water bath to 85 degrees, and react for 5 hours. The solution was reddish brown, and a small amount of undissolved palladium powder was filtered out. The filtrate was collected in a small rotary evaporating flask, concentrated under reduced pressure until the free nitric acid content was less than 10 wt%, cooled to 25°C, and 1g of octylphenol polyoxyethylene ether was added. Stir evenly and stand for 2 hours, dry, and burn at 600-700°C for at least 4 hours to obtain palladium oxide with a yield of 99.2%, a particle size of 11nm, and a hydrogen absorption catalytic effect of 0.20ml / g under standard conditions.
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