Non-noble metal catalyst for electrochemical oxidation of SO2, and preparation method and application of non-noble metal catalyst
A non-precious metal, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of high cost of electrochemical oxidation, achieve rich mesopores, simple process, and is conducive to SO2 oxidation and the effect of mass transfer
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Embodiment 1
[0050] Take 0.5g nonionic surfactant F127, add to 20mL 0.1mol L -1 FeCl 3 In the solution, fully stir and disperse; take 1g of melamine and add it into 100mL of 100°C deionized water, fully dissolve and stir; Fe 3+ 1. Add the non-ionic surfactant mixed solution into the melamine solution, stir fully, chelate reaction, then add porous carbon material BP2000 160mg, adjust the temperature to 80°C, stir and evaporate to dryness at a constant temperature of 80°C, and obtain the catalyst precursor. Put the catalyst precursor into the tube furnace, Ar atmosphere, at 2 °C min -1 Raise to 240°C, keep at constant temperature for 2h, then increase at 1°C min -1 Rise to 700°C and keep at constant temperature for 2h. Natural cooling, grinding to obtain such as figure 1 Catalysts shown.
Embodiment 2
[0052] 0.5g surfactant F127, 20mL 0.1mol L -1 FeCl 3 Fully dissolve and combine with 1g of melamine, add 160mg of BP2000, and evaporate to dryness at 80°C. Ar atmosphere, 240°C, constant temperature for 2h, 700°C for 2h. The high-resolution electron microscope image of the catalyst was obtained as figure 2 As shown, under microscopic conditions, the metal particles of the catalyst are coated and embedded in the carbon shell structure, and the distribution is uniform; the C and N elements on the surface of the catalyst are evenly distributed and bonded well, as shown in image 3 A scan of the elements is shown.
Embodiment 3
[0054] 0.5g F127, 20mL 0.1mol L -1 FeCl 3 Fully dissolve and combine with 1g of melamine, add 160mg of BP2000, and evaporate to dryness at a constant temperature of 80°C. Ar atmosphere, 240°C constant temperature for 2h, 700°C constant temperature for 2h. Obtain the XRD of the catalyst as Figure 4 As shown, the catalyst component is mainly Fe 3 C and Fe 3 o 4 . The catalyst is effectively metal-doped. The XPS characterization of the catalyst was as Figure 5 (a), (b) shown. The N and Fe element peak analysis shows that Fe and N in the catalyst are effectively doped in the carbon catalyst. Among them, the active components such as pyridine N, Fe-N and graphite N have obvious peak shapes. Fe-N structure accounted for the highest proportion according to Fe peak analysis.
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