Catalyst for preparation of isobutene from bromomethane with titanium dioxide as carrier and cerium as auxiliary agent, and preparation method and application thereof
A technology of titanium dioxide and a catalyst, which is applied in the field of preparation of a catalyst for producing isobutene with high selectivity from methyl bromide, can solve the problems that the selectivity of a single product is not high, and the synthesis of isobutene with high selectivity from methyl bromide has not been found, and achieves the promotion of removal, simple preparation method, The effect of mild reaction conditions
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Embodiment 1
[0029] Weigh an appropriate amount of cerium nitrate and dissolve it in deionized water, and load it on the titanium dioxide carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), dried at 100°C for 6h, and calcined at 500°C for 6h to prepare a titania carrier containing cerium oxide. Then weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on a titania carrier containing cerium oxide by equal volume impregnation method, dry at 100°C for 6h, and roast at 450°C for 6h to prepare the catalyst precursor ZnO / CeO 2 / TiO 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 concentration of methyl bromide is 60%, and the treatment conditions are 250°C, 0.2MPa (absolute pressure), 300h -1 , Time 2h, prepared isobutene catalyst from methyl bromide, denoted as C-1. Get cata...
Embodiment 2
[0033] Weigh an appropriate amount of cerium nitrate and dissolve it in deionized water, and load it on the titanium dioxide carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), dried at 120°C for 4h, and calcined at 400°C for 8h to prepare a titania carrier containing cerium oxide. Then weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on a titania carrier containing cerium oxide by equal volume impregnation method, dry at 100°C for 6h, and roast at 400°C for 8h to prepare the catalyst precursor ZnO / CeO 2 / TiO 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 concentration of methyl bromide is 60%, and the treatment conditions are 250°C, 0.2MPa (absolute pressure), 300h -1 , Time 2h, prepared isobutene catalyst from methyl bromide, denoted as C-2. Get cata...
Embodiment 3
[0037] Weigh an appropriate amount of cerium nitrate and dissolve it in deionized water, and load it on the titanium dioxide carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), dried at 80°C for 4h, and calcined at 600°C for 4h to prepare a titania carrier containing cerium oxide. Then weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on a titania carrier containing cerium oxide by equal volume impregnation method, dry at 120°C for 4h, and roast at 500°C for 4h to prepare the catalyst precursor ZnO / CeO 2 / TiO 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 concentration of methyl bromide is 60%, and the treatment conditions are 250°C, 0.2MPa (absolute pressure), 300h -1 , Time 2h, prepared isobutene catalyst from methyl bromide, denoted as C-3. Get catal...
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