Supported CO2 hydrogenation catalyst and preparation method thereof
A hydrogenation catalyst and CO2 technology, applied in the field of environmental chemistry, can solve the problems of low specific surface area of hydrogenation catalyst, poor copper dispersion, low conversion rate of raw materials, etc., to achieve favorable acid-base sites, reduce sintering and agglomeration, The effect of enriching the specific surface area
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Embodiment 1
[0027] This embodiment provides a self-assembled hollow spherical carrier, which is prepared according to the following steps: 3.42g Mg(NO 3 ) 2 ·3H 2 O, 1.98g Zn(NO 3 ) 2 ·6H 2 O and 3.75g Al(NO 3 ) 3 9H 2 O powder was dissolved in 50mL of deionized water to prepare a mixed metal salt solution, ultrasonically treated for 30 minutes, stirred until completely dissolved after taking it out; 7.21g of urea was added to the mixed metal salt solution, and continued to stir until completely dissolved; the resulting solution was transferred In a homogeneous reactor, react at 120°C for 24 hours; cool the solution after the reaction, filter it with suction, wash and dry the resulting filter residue, and successfully prepare the self-assembled hollow sphere carrier.
Embodiment 2
[0029] Characterize the self-assembled hollow sphere carrier obtained in Example 1: Attached figure 1 Its scanning electron microscope picture shows that its surface presents flake-like protrusions, with uniform overall size and regular shape, and a diameter of about 12 microns; attached figure 2 The scanning electron microscope picture of its section can prove that the synthesized product has a hollow structure, and the diameter of the hollow part is about 5 microns, accounting for 41.7% of the outer diameter of the sphere; it can be calculated through the low-temperature nitrogen absorption-desorption test that the self-assembled hollow sphere The BET specific surface area after carrier activation reaches 193.5m 2 / g, at a higher level.
Embodiment 3
[0031] Get 1g of the self-assembled hollow sphere carrier obtained in Example 1, and activate it in an air atmosphere at 350°C for 4 hours. Evenly disperse the activated carrier in 500mL copper nitrate solution with a concentration of 0.5mol / L, keep stirring until the slurry is uniform, and pour 50mL sodium hydroxide-vitamin C mixed solution (pH=~8) in a water bath at 70°C , reacted for 30min, filtered, washed, and dried to obtain the loaded CO 2 hydrogenation catalyst.
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