Alkaline earth metal modified supported catalyst as well as preparation method and application thereof
A supported catalyst and alkaline earth metal technology, which is applied in the field of halomethane to isobutene catalyst and its preparation, can solve the problems of undiscovered methyl bromide and low selectivity of a single product, and achieves simple preparation method, mild reaction conditions and broad application prospects. Effect
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Embodiment 1
[0024] An aqueous solution containing zinc nitrate and beryllium nitrate was prepared, loaded on an alumina carrier by an equal volume impregnation method, dried at 100°C for 8 hours, and calcined at 500°C for 4 hours to obtain a catalyst precursor. Use a continuous flow fixed-bed reactor to treat the catalyst precursor under a mixed atmosphere, wherein the volume content of methyl bromide is 30%, and the balance is nitrogen, and the treatment conditions are 230°C, 0.1MPa, 100h -1 , the time is 4h. Prepared methyl halide to produce isobutylene catalyst, by weight, ZnBr 2 The content of ZnO is 30%, the content of ZnO is 4%, and the content of Be as oxide is 0.5%.
[0025]The conversion of methyl bromide to isobutene is carried out in a continuous-flow miniature fixed-bed reactor. The catalyst loading is 5g, the raw material gas is a mixed gas of bromomethane and nitrogen, and the volume content of bromomethane is 50%, the reaction temperature is 230°C, the reaction pressure i...
Embodiment 2
[0027] An aqueous solution containing zinc nitrate and magnesium nitrate was prepared, loaded on an alumina carrier by an equal volume impregnation method, aged at room temperature for 4 hours, dried at 80°C for 12 hours, and calcined at 360°C for 10 hours to obtain a catalyst precursor. Use a continuous flow fixed-bed reactor to treat the catalyst precursor under a mixed atmosphere, wherein the volume content of methyl bromide is 30%, and the balance is nitrogen, and the treatment conditions are 230°C, 0.1MPa, 100h -1 , the time is 4h. Prepared methyl halide to produce isobutylene catalyst, by weight, ZnBr 2 The content of ZnO is 30%, the content of ZnO is 4%, and the content of Mg as oxide is 0.5%.
[0028] The conversion of methyl bromide to isobutene is carried out in a continuous-flow miniature fixed-bed reactor. The catalyst loading is 5g, the raw material gas is a mixed gas of bromomethane and nitrogen, of which the volume content of bromomethane is 70%, the reaction ...
Embodiment 3
[0030] Take 10g of alumina (the pore volume is 0.71ml / g, the specific surface area is 236m 2 / g, strip shape, equivalent diameter 1.5mm), according to the proportion of Zn and Ca accounting for 15% and 0.5% of the catalyst weight respectively, and the balance is alumina, the aqueous solution containing zinc nitrate and calcium nitrate is prepared, and the equal volume impregnation method is adopted Loaded on an alumina carrier, aged at room temperature for 4 hours, dried at 120°C for 6 hours, and calcined at 400°C for 6 hours to obtain a catalyst precursor. Use a continuous flow fixed-bed reactor to treat the catalyst precursor under a mixed atmosphere, wherein the volume content of methyl bromide is 30%, and the balance is nitrogen, and the treatment conditions are 230°C, 0.1MPa, 100h -1 , the time is 4h. Prepared methyl halide to produce isobutylene catalyst, by weight, ZnBr 2 The content of ZnO is 30%, the content of ZnO is 4%, and the content of Ca is 0.5% in terms of ox...
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