Metal modified foamed ceramic ozone catalyst and preparation method thereof
A technology of foam ceramics and metal modification, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Catalyst activity and stability, transfer performance and other issues are greatly affected, to achieve the effect of mass transfer, light weight and good mechanical properties
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Embodiment 1
[0039] (1) Soak alumina foam ceramics with a diameter of 45 mm and a thickness of 15 mm in 0.1 mol / L sodium hydroxide and 0.1 mol / L hydrochloric acid for 12 hours to remove surface oil and impurities, and rinse repeatedly with deionized water until neutral , place it in a blast drying oven to dry at 120°C, then raise the temperature to 500°C at a rate of 5°C / min, keep it warm for 4 hours, and let it cool down to room temperature naturally for use.
[0040](2) Immerse the washed, roasted and cooled alumina foam carrier in the aluminum sol, pull it out at a constant speed, and blow off excess liquid. Then dry at 120°C for 3h, bake at 550°C for 4h and cool down. The above process is repeated three times to increase the thickness of the coating.
[0041] (3) Immerse the alumina foam ceramics coated with the transition layer in 0.3mol / L cerium nitrate solution for 6h, put the alumina foam ceramic carrier adsorbed with cerium nitrate into a drying oven and dry at 120°C for 8h. The...
Embodiment 2
[0043] In step (3), the alumina foam ceramics coated with the transition layer was immersed in 0.3 mol / L ferric nitrate solution for 6 hours, and the alumina foam ceramic carrier adsorbed with ferric nitrate was placed in a drying oven at 120° C. for 8 hours to dry.
[0044] The dried samples were placed in a muffle furnace to be calcined at 500°C at a heating rate of 5°C / min and held for 4 hours to obtain an iron-modified alumina foam ceramic catalyst. Other preparation steps are as in Example 1.
Embodiment 3
[0046] In step (3), the alumina foam ceramics coated with the transition layer was immersed in 0.3 mol / L manganese nitrate solution for 6 hours, and the alumina foam ceramic carrier adsorbed with ferric nitrate was placed in a drying oven at 120° C. for 8 hours.
[0047] The dried samples were placed in a muffle furnace to be calcined at 500°C at a heating rate of 5°C / min and held for 4 hours to obtain a manganese-modified alumina foam ceramic catalyst. Other preparation steps are as in Example 1.
[0048] The catalysts prepared in Examples 1-3 of the present invention were used in the ozone catalytic degradation experiment to evaluate the performance of the catalysts. The experiment was carried out in a plexiglass reactor. Ozone entered the reactor from the bottom of the reactor through the aeration head and mixed with wastewater. The ozone gas phase concentration was 10mg / L, and the reaction temperature was 25°C; the catalyst dosage was 40g / L; the initial TOC was The 40ppm ...
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