Method for improving catalytic oxidation performance of silver-doped perovskite type metal oxide by etching silver-doped perovskite type metal oxide through reducing organic acid solution
A perovskite-type, catalytic oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problem that the catalytic activity cannot meet the needs of industrial applications, etc. To achieve the effect of being conducive to large-scale production, stable structure, and short reaction time
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Embodiment 1
[0028] According to the literature (Ni-substituted LaMnO 3 perovskites for ethanol oxidation) in the citric acid sol-gel method to prepare LaMnO with perovskite structure 3 and silver-doped La 0.9 Ag 0.1 MnO 3 ;
[0029] Take 0.5g LaMnO 3 or La 0.9 Ag 0.1 MnO 3 Put the powder in a beaker, add 50 mL of L-tartaric acid solution with a concentration of 1 mol / L, stir magnetically at 25 °C for 1 h, then filter and wash, transfer the filter cake to an oven at 80 °C for 24 h.
[0030] Press the powder into tablets and grind it into 40-60 mesh particles, and then evaluate the catalytic combustion performance of toluene. The evaluation conditions are: put 100mg of catalyst into the reactor, feed 100ml / min of synthetic air with a toluene concentration of 1000ppm , 20vol%O 2 , 80vol%N 2 . WHSV=60000mL·g -1 h -1 . The toluene catalytic combustion effect of the catalyst is shown in Table 1.
Embodiment 2
[0032] According to the literature (Improvements in electrical and dielectric properties of substituted multiferroic LaMnO 3 based nanostructures synthesized by co-precipitation method) in the co-precipitation method, the preparation of silver ion-doped La with perovskite structure 0.8 Ag 0.2 MnO3 ;
[0033] Take 0.5g La 0.9 Ag 0.2 MnO 3 Put the powder in a beaker, add 50mL of 2mol / L D-tartaric acid solution, magnetically stir at 40°C for 2h, then filter and wash, transfer the filter cake to an oven for 24h at 80°C.
[0034] Press the powder into tablets and grind it into 40-60 mesh particles, and then evaluate the catalytic combustion performance of toluene. The evaluation conditions are: put 100mg of catalyst into the reactor, feed 100ml / min of synthetic air with a toluene concentration of 1000ppm , 20vol%O 2 , 80vol%N 2 . WHSV=60000mL·g -1 h -1 . The toluene catalytic combustion effect of the catalyst is shown in Table 1.
Embodiment 3
[0036] According to the hydrothermal synthesis method in the literature (Engineering highly active oxygen sites in perovskite oxides for stable and efficient oxygen evolution), silver ion-doped La 0.9 Ag 0.1 CoO 3 ;
[0037] Take 0.5g La 0.9 Ag 0.1 CoO 3 Put the powder in a beaker, add 50mL of a mixed solution of D-tartaric acid and L-tartaric acid with a concentration of 1mol / L, stir magnetically at 25°C for 2h, then filter and wash, transfer the filter cake to an oven at 80°C for 24h.
[0038] Press the powder into tablets and grind it into 40-60 mesh particles, and then evaluate the catalytic combustion performance of toluene. The evaluation conditions are: put 100 mg of catalyst into the reactor, feed 100 mL / min of synthetic air with a toluene concentration of 1000 ppm , 20vol%O 2 , 80vol% N 2 . WHSV=60000mL·g -1 h -1 . The toluene catalytic combustion effect of the catalyst is shown in Table 1.
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