Application of Iron-Based Catalysts in Catalytic Carbon Dioxide Hydrogenation to Synthesize Light Olefins
A technology for catalyzing carbon dioxide and iron-based catalysts, used in catalysts, carbon compound catalysts, and hydrocarbon production from carbon oxides, etc., can solve problems such as low selectivity, and achieve the effects of simple preparation method, improved life, and stable properties
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Embodiment 1
[0038] Weigh 8.11g of FeCl 3 ·6H 2 O and 2.98g FeCl 2 ·4H 2 Dissolve O in 15 ml of deionized water to make Mixture A. Add 100ml of 3mol / L ammonia water (solution B) to the mixture A at a flow rate of 3ml / min using a constant-flow pump, place it in a 40°C water bath and stir continuously, and age for 2h after the addition is complete. The turbid liquid obtained was filtered and washed until neutral, and then the filter cake was dried in air at 80 °C for 12 h; the dried solid was calcined at 400 °C in air for 4 h to obtain solid C.
[0039] Weigh 2.0g of the above solid C and weigh 0.0524g of KNO 3 and 0.0002g FeSO 4 ·7H 2 O Dissolve it in 2 ml of deionized water to make a mixed solution, immerse the above-mentioned solid C sample in the above-mentioned mixed solution, and mix it evenly. Immersion at room temperature for 12h, drying at 60°C for 12h, roasting at 400°C for 4h, and finally grinding, tableting, crushing, and sieving (20-40 mesh) to obtain an iron-based cataly...
Embodiment 2
[0042] Weigh 2.0g of solid C prepared by the method of Example 1, and weigh 0.052g of KNO 3 and 0.002g FeSO 4 ·7H 2 O Dissolve it in 2 ml of deionized water to make a mixed solution, immerse the above-mentioned solid C sample in the above-mentioned mixed solution, and mix it evenly. Immersion at room temperature for 12h, drying at 60°C for 12h, roasting at 400°C for 4h, and finally grinding, tableting, crushing, and sieving (20-40 mesh) to obtain an iron-based catalyst, wherein the mass content of K is 1%, and the mass of S is 1%. The content is 0.01%, recorded as 1K-0.01S / Fe.
[0043] Catalyst reduction and activation conditions: the reducing gas is pure H 2 , purity>99.9%, space velocity 2000h -1 , the heating rate is 5°C / min, the reduction temperature is 400°C, the pressure is normal pressure, and the reduction time is 6h. Reaction conditions: molar ratio H 2 :CO 2 =3, the space velocity is 2000ml / (g cat h), the pressure is 3MPa, and the temperature is 320°C. The re...
Embodiment 3
[0045] Weigh 2.0g of solid C prepared by the method of Example 1, and weigh 0.052g of KNO 3 and 0.0176g FeSO 4 ·7H 2 O Dissolve it in 2 ml of deionized water to make a mixed solution, immerse the above-mentioned solid C sample in the above-mentioned mixed solution, and mix it evenly. Immersion at room temperature for 12h, drying at 60°C for 12h, roasting at 400°C for 4h, and finally grinding, tableting, crushing, and sieving (20-40 mesh) to obtain an iron-based catalyst, wherein the mass content of K is 1%, and the mass of S is 1%. The content is 0.1%, recorded as 1K-0.1S / Fe.
[0046] Catalyst reduction and activation conditions: the reducing gas is pure H 2 , purity>99.9%, space velocity 2000h -1 , the heating rate is 5°C / min, the reduction temperature is 400°C, the pressure is normal pressure, and the reduction time is 6h. Reaction conditions: molar ratio H 2 :CO 2 =3, the space velocity is 2000ml / (g cat h), the pressure is 3MPa, and the temperature is 320°C. The res...
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