A kind of core-shell amorphous silicon-alumina catalyst and preparation method thereof
An amorphous silica-alumina catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrocarbon production from oxygen-containing organic compounds, etc., to achieve high selectivity and avoid the effect of separation process
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Embodiment 1
[0048] According to the method of Comparative Example 1, XQ1-2 was prepared from the amorphous silica-alumina pellet XQ1. In XQ1-2, the nickel content is 0.40wt%, SiO 2 Content 86.90wt%, Al 2 o 3 The content is 12.70wt%.
[0049] Add an appropriate amount of zinc carbonate and ammonium chloride solution to the silica-alumina gel GLJ1 in Comparative Example 1, mix it evenly, spray it on XQ1-2, dry it at 120°C for 4 hours, and bake it at 500°C for 6 hours to obtain the core-shell structure SL -1 Catalyst. The weight ratio of the core layer A to the shell layer B is 7:1, in the shell layer B, SiO 2 The aluminum oxide content is 34.80wt%, the alumina content is 64.80wt%, the zinc content is 0.30wt%, and the chlorine content is 0.10wt%. The specific evaluation results are shown in Table 1.
Embodiment 2
[0051] Immerse the amorphous silica-alumina pellet XQ1 in Comparative Example 1 into Ca(NO 3 ) 2 After soaking in aqueous solution, calcined at 600°C for 3 hours to obtain calcium-containing amorphous silica-alumina pellets XQ1-4, and then treated with saturated water vapor at 500°C for 1.5 hours to obtain XQ1-5. In XQ1-5, the content of calcium is 0.80wt%, SiO 2 Content 86.50wt%, Al 2 o 3 The content is 12.70wt%.
[0052] Add an appropriate amount of mixed solution of ferric nitrate and ammonium bromide to the silica-alumina gel GLJ1 in Comparative Example 1, mix well, spray and dip on (XQ1-5), dry at 110°C for 4 hours, and roast at 500°C for 5 hours to obtain the nucleus Shell structure SL-2 catalyst. The weight ratio of the core layer A to the shell layer B is 10:1; in the shell layer B, the silicon oxide content is 34.82wt%, the alumina content is 64.66wt%, the iron content is 0.40wt%, and the bromine content is 0.12wt%. The specific evaluation results are shown in T...
Embodiment 3
[0054] Immerse a certain amount of amorphous silicon aluminum pellets XQ2 (particle size 2.6mm-2.9mm) into Be(NO 3 ) 2 After soaking in aqueous solution, roast at 500°C for 5 hours to obtain beryllium-containing amorphous silicon-alumina XQ2-1, and then treat it with saturated water vapor at 200°C for 4 hours to obtain XQ2-2. In XQ2-2, the content of beryllium is 0.95wt%, SiO 2 Content 81.22wt%, Al 2 o 3 The content is 17.83wt%.
[0055]Add an appropriate amount of mixed solution of zinc acetate and ammonium bromide to silica-alumina gel GLJ2, mix well, spray and dip XQ2-2, dry at 120°C for 2h, and roast at 450°C for 5h to obtain the core-shell structure SL-3 catalyst. The weight ratio of the core layer A to the shell layer B is 6:1. In the shell layer B, the silicon oxide content is 44.84wt%, the alumina content is 54.74wt%, the zinc content is 0.34wt%, and the bromine content is 0.08wt%. The specific evaluation results are shown in Table 1.
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