A CO based on adsorption enhancement 2 Hydrogenation catalyst and its preparation method
A hydrogenation catalyst and enhancement technology, applied in the preparation of hydroxyl compounds, catalysts for physical/chemical processes, chemical instruments and methods, etc., can solve the problems of low conversion rate, high reaction pressure, low methanol selectivity, etc., and achieve applicability Strong, simple process, and the effect of improving methanol selectivity
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[0049] The preparation of this catalyst requires the following steps to complete:
[0050] S1. Calcining the hydrotalcite-like compound in air, the calcination temperature is 350-400°C, the calcination time is 3-6hr, the heating rate is 1-10°C / min, and the activated hydrotalcite-like compound is obtained after the calcination;
[0051] S2. Uniformly dispersing the activated hydrotalcite-like compound in solution A containing two or three metal cations to obtain a slurry solution;
[0052] S3. Treat the above slurry solution in ultrasonic for 5-20 minutes, and stir at room temperature for 1-2 hr after ultrasonic treatment, and obtain solution B after stirring;
[0053] S4. Continue to stir solution B at room temperature, and add solution C dropwise therein at a rate of 1-3 mL / min until the pH value of the solution rises to 9-10, then stop the dropwise addition to obtain solution D;
[0054] S5. Stir the solution D at room temperature for 1 to 3 hrs, and then let it stand for 1...
Embodiment 1
[0061] Embodiment 1-catalyst and its preparation process first embodiment
[0062] Take an appropriate amount of commercial hydrotalcite-like compound and activate it by calcining in a tube furnace at a calcining temperature of 400° C., a calcining time of 4 hours, and a heating rate of 1° C. / min. Take an appropriate amount of copper nitrate, zinc nitrate, and zirconyl nitrate to prepare a solution with a total metal concentration of 1.6 mol / L according to the molar ratio of Cu:Zn:Zr=6:3:1, and record it as solution A. Among them, copper nitrate and zinc nitrate provide Cu in solution A 2+ Ions and Zn 2+ ions, as active centers; zirconyl nitrate provides Zr in solution A 4+ Ions, as doping metal additives. Take an appropriate amount of potassium carbonate to make a solution with a concentration of 2 mol / L, and record it as solution C.
[0063] 3 g of the activated hydrotalcite-like compound was uniformly dispersed in 12.5 mL of solution A, and ultrasonically treated for 5 ...
Embodiment 2
[0064] The activation process of catalyst in embodiment 2-embodiment 1
[0065] The activation (reduction) of the catalyst in Example 1 was performed in situ in a fixed bed reactor.
[0066] First, the catalyst is compressed into pellets with a diameter of 200-500 μm. Take 1g of the catalyst after tableting and mix with 1g of quartz sand (50-70 mesh) evenly, and load it into the reaction column. Subsequently, the reactor temperature was controlled by a heating furnace, at 300 °C H 2 After 4 hours of reduction under atmosphere, the catalyst was completely reduced. Finally, the heating is stopped and the H 2 Switch to N 2 until the reactor cools down to room temperature.
[0067] CO after catalyst activation of embodiment 3-embodiment 1 2 Transformation performance test
[0068] By controlling the heating furnace and the back pressure valve, the activated catalyst in Example 2 is reacted at 3.0MPa, the reaction temperature is 200°C, 250°C, 300°C, and its CO 2 The convers...
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