A kind of isobutylene catalyst from methyl bromide treated by alcohol solution and its preparation method and application
A catalyst, a technology for methyl bromide, applied in the field of high-selectivity methyl bromide catalyst for isobutene production and the preparation thereof, can solve the problems of low selectivity of a single product, high selectivity synthesis of isobutylene from methyl bromide and the like, and achieve a simple preparation method and mild reaction conditions. , the effect of high product selectivity
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Embodiment 1
[0029] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on a silica carrier (the pore volume is 1.06ml / g, the specific surface area is 387m 2 / g, spherical shape, equivalent diameter 0.5mm), dried at 100°C for 6h, and calcined at 500°C for 6h to obtain the catalyst precursor ZnO / SiO 2 . Prepare 2mol / L methanol aqueous solution, according to the solution and ZnO / SiO 2 The mixture was mixed at a weight ratio of 15, placed in a heating reflux apparatus, the temperature was controlled at 60°C, and heated to reflux for 2 hours. After cooling down, the solid and liquid were separated, and the obtained solid was dried at 90°C for 2 hours. Then the dried solid was placed in a continuous flow fixed bed reactor, and the catalyst precursor was treated with a mixed gas of methyl bromide and nitrogen. The volume concentration of methyl bromide was 80%, and the treatment conditions were 250°C, 0.2MPa (absolute pressure), 300h -1 , Time 2h, prepar...
Embodiment 2
[0033] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on a silica carrier (the pore volume is 1.06ml / g, the specific surface area is 387m 2 / g, spherical shape, equivalent diameter 0.5mm), dried at 100°C for 6h, and calcined at 500°C for 6h to obtain the catalyst precursor ZnO / SiO 2 . Prepare 1mol / L methanol aqueous solution, according to the solution and ZnO / SiO 2 The mixture was mixed at a weight ratio of 15, placed in a heating reflux apparatus, the temperature was controlled at 60°C, and heated to reflux for 2 hours. After cooling down, the solid and liquid were separated, and the obtained solid was dried at 90°C for 2 hours. Then the dried solid was placed in a continuous flow fixed bed reactor, and the catalyst precursor was treated with a mixed gas of methyl bromide and nitrogen. The volume concentration of methyl bromide was 80%, and the treatment conditions were 250°C, 0.2MPa (absolute pressure), 300h -1 , Time 2h, prepar...
Embodiment 3
[0037] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on a silica carrier (the pore volume is 1.06ml / g, the specific surface area is 387m 2 / g, spherical shape, equivalent diameter 0.5mm), dried at 100°C for 6h, and calcined at 500°C for 6h to obtain the catalyst precursor ZnO / SiO 2 . Prepare 3mol / L methanol aqueous solution, according to the solution and ZnO / SiO 2 The mixture was mixed at a weight ratio of 15, placed in a heating reflux apparatus, the temperature was controlled at 60°C, and heated to reflux for 2 hours. After cooling down, the solid and liquid were separated, and the obtained solid was dried at 90°C for 2 hours. Then the dried solid was placed in a continuous flow fixed bed reactor, and the catalyst precursor was treated with a mixed gas of methyl bromide and nitrogen. The volume concentration of methyl bromide was 80%, and the treatment conditions were 250°C, 0.2MPa (absolute pressure), 300h -1 , Time 2h, prepar...
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