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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

Inactive Publication Date: 2017-07-18
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the co-precipitation method, although the invention uses two precipitations, the specific surface area of ​​the prepared LDH material is higher, but the reaction time of the invention is longer, and the reaction time given in the examples is more than 10 hours
The purpose of this invention is to prepare layered composite hydroxide (LDH) with high specific surface area. The structural formula of this layered composite hydroxide is complex, which may involve multiple metals or combinations thereof. The preparation process requires two steps of precipitation respectively, and the reaction time longer

Method used

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  • Composite carrier containing zinc oxide-aluminum oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a composite carrier containing zinc oxide-aluminum oxide and a preparation method thereof. The composite carrier contains zinc oxide containing zinc-aluminum spinel, aluminum oxide, auxiliary component phosphor, potassium and magnesium. The composite carrier is characterized by uniformly dispersed zinc aluminum and high specific surface area and can be used as a carrier for FCC catalyst sulfur-reducing auxiliary agent and FCC hydrogen desulfurization or hydrogenation catalyst.

Description

technical field [0001] The invention belongs to the technical field of hydrodesulfurization catalysts, and in particular relates to a zinc oxide-alumina composite carrier and a preparation method thereof. The composite carrier can be used as an FCC catalyst sulfur-reducing additive and an FCC hydrodesulfurization carrier. Background technique [0002] With the increasingly stringent requirements of environmental protection laws, the sulfur content in finished gasoline is subject to stricter restrictions. At present, more than 80% of the finished gasoline in our country is FCC gasoline. Since FCC gasoline generally has a sulfur content of 100-500v%, there are even high-sulfur and high-olefin feedstock oils with a sulfur content of more than 500mg / kg and an olefin content of more than 40. %. Selective hydrodesulfurization technology will inevitably cause partial saturation of olefins and lower octane number during deep hydrodesulfurization, which requires hydrodesulfurization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J27/18B01J35/10C10G45/04
CPCC10G45/04B01J27/1808C10G2300/202C10G2400/02C10G2300/104B01J35/615
Inventor 晁会霞罗祥生赖家凤
Owner QINZHOU UNIV
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