α-Al2O3-supported ferric oxide catalyst and preparation method thereof
A catalyst and carrier technology, applied in the field of α-Al2O3-loaded Fe3O4 catalyst and its preparation, can solve the problems that are not conducive to the improvement of conversion rate, low-carbon olefins, large particle size, reduced catalyst activity and stability, etc., and reach the service life Long, high selectivity, enhanced activity and stability
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Embodiment 1
[0042] Preparation of 12nm particle size Fe with 10% Fe content 3 o 4 / α-Al 2 o 3 catalyst. The preparation process is as follows: mix the mixed solution (80mL ethanol, 64mL deionized water, 140mL hexane), weigh 6.50g FeCl 3 , 36.5g of sodium oleate was dissolved in the mixed solution; the mixed solution was heated to 60°C and kept for 4 hours. After the reaction was completed, it was washed with 100mL of water and separated by a separatory funnel. The supernatant was taken and washed five times repeatedly. Remove excessive solvent by distillation under reduced pressure; The ferric oleate 36g and 3.0g oleic acid obtained are dissolved in 100g octadecene; 2 Degas for 30 minutes; raise the temperature to 320°C at a rate of 3.3°C / min, and keep it for 30 minutes (a series of reactions occurred, and the initial transparent solution turned into a turbid and brown solution), then naturally cool to room temperature; add 250mL ethanol for precipitation , centrifuged (9500rpm, 10mi...
Embodiment 2-4
[0046] Under the completely identical situation of other experimental conditions and embodiment 1, change the oleic acid amount into 2.4g (embodiment 2) respectively, 3.4g (embodiment 3), 5.70g (embodiment 4), obtain different grain sizes Fe 3 o 4 Nanoparticles, and finally get the same loading of Fe with different particle sizes 3 o 4 / α-Al 2 o 3 Catalyst, the Fe that embodiment 2-4 obtains 3 o 4 / α-Al 2 o 3 The TEM spectra of the catalysts are as follows figure 1 a, 1c, and 1d, the XRD spectra are as follows figure 2 d, 2c, 2a shown.
[0047] Depend on figure 1 It can be seen that the Fe prepared by pyrolysis method 3 o 4 The nanoparticle size distribution is very uniform (within 10%). At the same time, by changing the ratio of oleic acid to iron oleate, different sizes of Fe can be obtained 3 o 4 nanoparticles.
[0048] Depend on figure 2 It can be seen that the catalysts obtained with different particle sizes and metal doping mainly contain Fe 3 o 4 C...
Embodiment 5-8
[0050] The dried catalyst powder is compressed into tablets and sieved to 40~60 meshes, and the catalyst (the mass fraction of Fe in the catalyst is 10%) that measures the embodiment 1-4 that obtains, and the loading capacity is 0.2g, in pressurized micro-reaction The catalyst activity was evaluated systematically, and Examples 5-8 were obtained respectively. Feed the reactant 45mL / min CO, 45mL / minH 2 And internal standard gas 10mL / min Ar, at 340°C, 1.0Mpa, the ratio of reaction gas flow rate to the amount of catalyst is 27000mL g -1 h -1 The reaction was carried out, and the product was analyzed by gas chromatography. The resulting reaction properties are shown in Table 1.
[0051] Table 1 Fe with different particle sizes 3 o 4 loaded onto α-Al 2 o 3 Catalytic Syngas Efficient Conversion Reaction Results on
[0052]
[0053] Among them: FTY represents the number of moles of CO converted per unit mass of iron per second, and O / P(2-4) represents C 2 ~C 4 The ratio ...
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