Platinum or palladium catalyst with metal nanoparticles coated by titanium dioxide as well as preparation and application thereof
A technology of metal nanoparticles and titanium dioxide, which is applied in the field of platinum and palladium catalysts and their preparation, can solve problems such as inability to exert obvious effects, achieve good activity and stability, practical preparation conditions, and inhibit sintering
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Embodiment 1-13
[0026] 1. Investigate the influence of various conditions on the catalyst activity in the equal volume wet impregnation process.
[0027] Isovolume wet impregnation method (IWI method) to load platinum: a certain amount of platinum source solution with a mass fraction of 1 to 8.33 wt% is added dropwise on the titanium dioxide carrier, so that the mass ratio of platinum to the carrier ranges from 0.005 to 0.04; Then dry at 60°C for 2 hours, then dry at 120°C for 12 hours, then bake at 200-500°C for 4 hours in air, and then bake at 400-600°C for 1-4 hours under nitrogen atmosphere.
[0028] Melamine modification: Dissolve 0.3g of melamine in 60mL of water, then add 0.6g of the catalyst prepared above, react at 75°C for 36 hours, centrifuge, wash with water, dry at 70°C for 12 hours, and bake the catalyst at 600°C for 3 hours under a nitrogen atmosphere. Then cool to room temperature and bake at 800°C for 3 hours in an air atmosphere.
[0029] When investigating the activity tes...
Embodiment 14-31
[0034] 2. Investigate the effect of various conditions on the catalyst activity during the modification of melamine
[0035] Isometric wet impregnation method (IWI method) loaded platinum: 0.5g of chloroplatinic acid solution with a mass fraction of 7.25wt% was added dropwise to 1.0g of titanium dioxide carrier; then dried at 60°C for 2 hours, then dried at 120°C Dry for 12 hours, then bake at 400°C for 4 hours in an air atmosphere, and then bake at 600°C for 4 hours in a nitrogen atmosphere.
[0036] Melamine modification: Weigh 0.1-0.3g melamine and dissolve it in 60mL water, add 0.1-0.6g catalyst prepared above, react at 60-90°C for 12-48 hours, centrifuge, wash with water, and dry at 80°C for 12 hours. Calcined under nitrogen atmosphere at ~700°C for 1 to 6 hours, then cooled to room temperature and calcined under air atmosphere at 800°C for 3 hours.
[0037] When testing the activity of the catalyst, the CO oxidation reaction was used as the probe reaction, and the T 50...
Embodiment 32-36
[0043] 3. Investigate the roasting temperature and TiO x Influence of the shell layer on the activity and stability of the catalyst
[0044] Isometric wet impregnation method (IWI method) loaded platinum: 0.5g of chloroplatinic acid solution with a mass fraction of 7.25wt% was added dropwise to 1.0g of titanium dioxide carrier; then dried at 60°C for 2 hours, then dried at 120°C Dry for 12 hours, then bake at 400°C for 4 hours in an air atmosphere, and then bake at 600°C for 4 hours in a nitrogen atmosphere.
[0045] Melamine modification: Dissolve 0.3g of melamine in 60mL of water, then add 0.6g of the catalyst prepared above, react at 75°C for 36 hours, centrifuge, wash with water, dry at 70°C for 12 hours, and bake the catalyst at 600°C for 3 hours under a nitrogen atmosphere. Then cool to room temperature and bake in air atmosphere at 600-800°C for 3 hours.
[0046] Investigate the calcination temperature and TiO x When the shell layer affects the activity and stability...
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