A kind of catalyst with silicon dioxide as carrier and its preparation method and application
A technology of silica and catalysts, applied in physical/chemical process catalysts, chemical instruments and methods, and hydrocarbon production from halogen-containing organic compounds, etc., can solve the problem of low selectivity of a single product and the high selectivity of methyl bromide to synthesize isobutene. and other problems, to achieve the effect of simple preparation method, mild reaction conditions and high product selectivity
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Embodiment 1
[0028] Weigh an appropriate amount of cetyltrimethylammonium bromide, TMB, and tetraethylorthosilicate, add it to an appropriate amount of deionized water, stir evenly, and after obtaining a clear solution, add an appropriate amount of ethyl acetate, and stir at 70°C Generate a sol, stir at 80°C to form a gel, age the obtained gel in air for 15 hours, dry at 80°C for 18 hours, heat up to 500°C at 1°C / min and bake for 6 hours to obtain a silica carrier. Hexaalkyltrimethylammonium bromide: TMB: silicon element: water: ethyl acetate = 1:0.1:1:80:10.
[0029] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on the above-mentioned silica carrier by equal volume impregnation method, dry at 100°C for 6h, and calcinate at 500°C for 6h to prepare the catalyst precursor ZnO / SiO 2 . The catalyst precursor is placed in a continuous flow fixed-bed reactor, and the catalyst precursor is treated with a mixed gas of methyl bromide and nitrogen. The volu...
Embodiment 2
[0032] Weigh an appropriate amount of cetyltrimethylammonium bromide, TMB, and tetraethylorthosilicate, add it to an appropriate amount of deionized water, stir evenly, and after obtaining a clear solution, add an appropriate amount of ethyl acetate, and stir at 60°C Generate a sol, stir at 70°C to form a gel, age the obtained gel in air for 20 hours, dry at 60°C for 24 hours, heat up to 700°C at 3°C / min and bake for 8 hours to obtain a silica carrier. Hexaalkyltrimethylammonium bromide: TMB: silicon element: water: ethyl acetate = 5:2:1:200:20.
[0033] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on the above-mentioned silica carrier by equal volume impregnation method, dry at 80°C for 8h, and roast at 400°C for 8h to prepare the catalyst precursor ZnO / SiO 2 . The catalyst precursor is placed in a continuous flow fixed-bed reactor, and the catalyst precursor is treated with a mixed gas of methyl bromide and nitrogen. The volume con...
Embodiment 3
[0036] Weigh an appropriate amount of cetyltrimethylammonium bromide, TMB, and tetraethylorthosilicate, add it to an appropriate amount of deionized water, stir evenly, and after obtaining a clear solution, add an appropriate amount of ethyl acetate, and stir at 70°C A sol is formed, and the stirring is continued until a gel is formed. The obtained gel is aged in air for 18 hours, dried at 70°C for 18 hours, and heated at 2°C / min to 600°C for 7 hours to obtain a silica carrier, in which hexadecane Trimethylammonium bromide: TMB: silicon element: water: ethyl acetate = 3: 1.2: 1: 120: 15.
[0037] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on the above-mentioned silica carrier by equal volume impregnation method, dry at 120°C for 4h, and calcinate at 600°C for 4h to prepare the catalyst precursor ZnO / SiO 2 . The catalyst precursor is placed in a continuous flow fixed-bed reactor, and the catalyst precursor is treated with a mixed ga...
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