Composite carrier containing zinc oxide-aluminum oxide and preparation method thereof
A composite carrier, zinc oxide technology, applied in catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex structure and long reaction time of layered composite hydroxide, and achieve the effect of intra-catalyst diffusion Good, large specific surface area, good hydrodesulfurization selectivity effect
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Embodiment 1
[0033] Dissolve 1.2kg of zinc nitrate in 6L of water to make a solution containing zinc, and dissolve 0.24kg of sodium metaaluminate and 0.30kg of sodium carbonate in 4L of water to make a solution containing aluminum. Divide the zinc-containing solution into 3 equal parts, each 2L. Take 2L of zinc-containing solution, keep the temperature at 80°C, add aluminum-containing mixed solution dropwise to it until the pH value reaches 9.0; stop dropping the aluminum-containing mixed solution, then add 2L of zinc-containing solution dropwise to the mixing system, and continue to drop aluminum-containing solution Mix the solution until the pH value reaches 9.0; titrate the aluminum-containing mixed solution and the zinc-containing solution alternately until all the zinc-containing solutions are added, and add the aluminum-containing mixed solution dropwise until the pH reaches 9.0. The total titration time is 3 hours. The obtained mixture was aged at 80°C for 4h, cooled and washed unti...
Embodiment 2
[0040] The preparation method and steps of the composite carrier containing zinc oxide-alumina are the same as in Example 1, and the zinc oxide containing zinc-aluminum spinel is prepared, and the pH value is adjusted to 8.7. In terms of oxides, the content of zinc oxide is 70%; the specific surface area is 191m 2 / g.
[0041] The composite carrier includes 25wt% of zinc oxide containing zinc-aluminum spinel, 71.9wt% of alumina, and the contents of phosphorus, potassium and magnesium in the auxiliary components are P 2 o 5 0.4wt%, K 2 O 0.8wt%, MgO 0.6wt%.
[0042] The difference is that after the composite carrier is obtained, potassium and magnesium are used to modify the surface of the composite carrier containing zinc oxide-alumina. The specific process includes the following steps: configure an aqueous solution containing potassium nitrate and magnesium nitrate as a spray liquid, and weigh Potassium nitrate 1.5g, magnesium nitrate 11.9g, completely dissolved in 30ml ...
Embodiment 3
[0045] The preparation method and steps of the composite carrier containing zinc oxide-alumina are the same as in Example 1. Zinc oxide containing zinc aluminum spinel was prepared, and the pH value was adjusted to 9.3. Zinc oxide containing zinc aluminum spinel, calculated as oxide, the content of zinc oxide is 63%; the specific surface area is 214m 2 / g.
[0046] The composite carrier includes 18.3wt% of zinc oxide containing zinc-aluminum spinel, 79wt% of alumina, and the contents of phosphorus, potassium and magnesium in the auxiliary components are P 2 o 5 0.9wt%, K 2 O 0.8wt%, MgO 1.0wt%. Composite carrier specific surface area 242m 2 / g.
[0047] Ammonium molybdate and cobalt nitrate are prepared as an impregnation solution, and the composite carrier containing zinc oxide-alumina is impregnated. The specific steps are the same as in Example 1. Dry at 130°C for 4 hours, and calcined at 600°C for 6 hours to obtain Hydrodesulfurization Catalyst 3. The main composi...
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