A kind of transition metal single-atom catalyst, its preparation method and application
A technology of transition metals and transition metal salts, which is applied in the field of its preparation and transition metal single-atom catalysts, and can solve problems such as the regulation of single-atom sites of transition metals that are rarely considered
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Embodiment 1
[0042] At room temperature, 5g urea, 0.15g boric acid, 0.5g PEG-2000 and 0.01mmol RuCl 3 ·H 2 O is dissolved in ultrapure water to obtain a clear and uniform mixed solution, and the concentration of each substance in the water is not limited, and then the mixed solution is rapidly cooled in liquid nitrogen to form a low-temperature block, freeze-dried to completely remove water, and then passed Grinding or ball milling produces a homogeneous solid powder to allow subsequent carbonization to be uniform. Next, the solid powder was carbonized in argon for 6 hours at a carbonization temperature of 900 degrees Celsius, and a nanotubular catalyst loaded with metal ruthenium single atomic sites was obtained after natural cooling. The field emission scanning electron microscope pictures of the product are as follows: Figure 1a As shown, the spherical aberration-corrected high-angle annular dark-field scanning transmission electron microscope photo is as follows Figure 1b shown, f...
Embodiment 2
[0044] At room temperature, 5g urea, 0.15g boric acid, 0.5g PEG-8000 and 0.01mmol RuCl 3 ·H 2 O is dissolved in ultrapure water to obtain a clear and uniform mixed solution, and the concentration of each substance in the water is not limited, and then the mixed solution is rapidly cooled in liquid nitrogen to form a low-temperature block, freeze-dried to completely remove water, and then passed Grinding or ball milling produces a homogeneous solid powder to allow subsequent carbonization to be uniform. Next, the above solid powder was carbonized in argon for 6 hours at a carbonization temperature of 900 degrees Celsius, and after natural cooling, a nanosheet catalyst loaded with metal ruthenium single atomic sites was obtained. The field emission scanning electron microscope pictures of the product are as follows: Figure 2a As shown, the spherical aberration-corrected high-angle annular dark-field scanning transmission electron microscope photo is as follows Figure 2b sho...
Embodiment 3
[0047] At room temperature, 5g urea, 0.15g boric acid, 0.5g PEG-2000 and 0.01mmol FeCl 3 ·6H 2 O is dissolved in ultrapure water to obtain a clear and uniform mixed solution, and the concentration of each substance in the water is not limited, and then the mixed solution is rapidly cooled in liquid nitrogen to form a low-temperature block, freeze-dried to completely remove water, and then passed Grinding or ball milling produces a homogeneous solid powder to allow subsequent carbonization to be uniform. Next, the above solid powder was carbonized in argon for 6 hours at a carbonization temperature of 900 degrees Celsius, and a nanotubular catalyst loaded with metal iron single atomic sites was obtained after natural cooling. The field emission scanning electron microscope pictures of the product are as follows: Figure 4a As shown, the spherical aberration-corrected high-angle annular dark-field scanning transmission electron microscope photo is as follows Figure 4b shown,...
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