Synthetic gas conversion catalyst, and preparation method and applications thereof
A synthesis gas conversion and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of improving methane selectivity, reducing activity stability, preparing The process is complex and other problems, to achieve the effect of improving the degree of dispersion and reduction, reducing the concentration of hydroxyl groups, and simple preparation
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example 1
[0019] Weigh commercially available silica gel (the pore volume is 1.06ml / g, the specific surface area is 386.81m 2 per 10 grams of this silica gel with distilled water added dropwise until the volume of water consumed during initial moistening is 16ml, the following examples all use this silica gel) 30g, the pH value is adjusted to 5.5, and the mass concentration of zinc ions is 2% zinc nitrate The solution is excessively impregnated on the silica gel carrier, the impregnation temperature is 75°C, and the impregnation time is 50h. After impregnation, the excess zinc nitrate solution is filtered off, dried at 100°C for 20h, and roasted at 400°C for 8h. Based on the final catalyst cobalt content of 5wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, impregnate it, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst was designated as C-1.
[0020] Catalyst e...
example 2
[0022] Weigh 30 g of commercially available silica gel, adjust the pH value to 5, and use a zinc nitrate solution with a mass concentration of zinc ions of 1% to excessively impregnate the silica gel carrier. The impregnation temperature is 60 ° C, and the impregnation time is 10 hours. Remove excess zinc nitrate solution, dry at 50°C for 36h, and bake at 300°C for 2h. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, impregnate it, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst is designated C-2. The experimental conditions for catalyst activity evaluation are the same as in Example 1. The results of the Fischer-Tropsch synthesis reaction over the C-2 catalyst are shown in Table 1.
example 3
[0024] Weigh 30 g of commercially available silica gel, and use a zinc sulfate solution with a pH value of 6 and a zinc ion concentration of 3% to excessively impregnate the silica gel carrier. The impregnation temperature is 80°C, and the impregnation time is 100 hours. Filter off excess zinc sulfate solution, dry at 150°C for 2h, and bake at 500°C for 15h. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, impregnate it, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst is designated C-3. The experimental conditions for catalyst activity evaluation are the same as in Example 1. Table 1 shows the results of the Fischer-Tropsch synthesis reaction over the C-3 catalyst.
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