A kind of supported silver single-atom catalyst for the oxidation of unsaturated polycarbonate alcohol and its preparation method
A catalyst and supported technology, which is applied in the field of supported silver single-atom catalyst and its preparation, can solve the problems of easy sintering or carbon formation of catalysts, low catalyst activity, and large amount of precious metals used, so as to reduce the amount of recycled use and the service life of catalysts. The effect of long and low production cost
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Embodiment 1
[0060] Weigh 1.18g of silver nitrate, 0.90g of molybdenum oxide, and 147.465g of silicon carbide, and add them successively to 2233.47g of dilute nitric acid with a mass fraction of 15%, stir evenly, and stir and reflux for 6 hours in an oil bath at 40°C; Add 0.42g of titanium dioxide and 0.225g of europium oxide powder to the mixture, and ultrasonically treat it at 30°C for 1 hour; add urotropine to the liquid obtained above to adjust the pH=7, then add 0.24g of sodium hexachlororhodate powder, and stir well ; The above mixture was dried by rotary evaporation at 65°C to obtain a solid powder; the solid powder was ground in an agate mortar for 1h, then put into a tube furnace, and treated at 350°C for 1.5h to obtain a silver single-atom dispersed catalyst 1 -1. The content of each component in the catalyst is shown in Table 1.
Embodiment 2
[0062] Weigh 2.41g of silver nitrate, 1.02g of molybdenum oxide, and 166.447g of silicon carbide, and add them successively to 2514.88g of dilute nitric acid with a mass fraction of 15%, stir evenly, and stir and reflux for 6 hours in an oil bath at 35°C; Add 0.476g of titanium dioxide and 0.255g of europium oxide powder to the mixture, and ultrasonically treat it at 40°C for 1 hour; add urotropine to the liquid obtained above to adjust the pH=7, then add 0.272g of sodium hexachlororhodate powder, and stir evenly ; Dry the above mixture at 55°C to obtain a solid powder; put the solid powder into an agate mortar and grind for 1h, then put it in a tube furnace, and treat it at 450°C for 1h to obtain a silver single-atom dispersed catalyst 1- 2. The content of each component in the catalyst is shown in Table 1.
Embodiment 3
[0064] Weigh 0.598g of silver nitrate, 1.14g of molybdenum oxide, and 187.359g of silicon carbide, and successively add them to 2842.75g of dilute nitric acid with a mass fraction of 15%, stir evenly and reflux for 6 hours in an oil bath at 40°C; Add 0.532g of titanium dioxide and 0.285g of europium oxide powder to the mixture, and ultrasonically treat it at 30°C for 1 hour; add urotropine to the liquid obtained above to adjust the pH to 7, then add 0.304g of sodium hexachlororhodate powder, and stir evenly ; The above mixture was dried by rotary evaporation at 65°C to obtain a solid powder; the solid powder was ground in an agate mortar for 1h, then put into a tube furnace, and treated at 350°C for 1.5h to obtain a silver single-atom dispersed catalyst 1 -3. The content of each component in the catalyst is shown in Table 1.
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