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Additive-containing zinc oxide-aluminum oxide composite carrier and preparation method

A technology of composite carrier and zinc oxide, which is applied in the direction of catalyst carrier, chemical instrument and method, chemical/physical process, etc., can solve the problems of complex structure and long reaction time of layered composite hydroxide

Inactive Publication Date: 2017-05-31
LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 a high specific surface area. The structure of the layered composite hydroxide is complex and may involve a variety of metals or their combinations. The preparation process requires two steps of precipitation respectively, and the reaction time longer

Method used

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  • Additive-containing zinc oxide-aluminum oxide composite carrier and preparation method
  • Additive-containing zinc oxide-aluminum oxide composite carrier and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 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

[0034] The preparation method and steps of the zinc oxide-alumina composite carrier containing additives 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. The difference is that after the composite carrier is obtained, potassium and strontium are used to modify the surface of the zinc oxide-alumina composite carrier containing additives. Potassium nitrate 3.0g, strontium nitrate 3.0g, completely dissolved in 30ml of distilled water, then diluted with deionized water, made into impregnating solution impregnated with zinc oxide-alumina composite carrier, dried and roasted to obtain the surface with additives potassium and strontium Modified zinc oxide-alumina composite support. The specific surface area of ​​the composite carrier is 233m 2 / g.

[0035] Ammonium molybdate and cobalt nitrate were made int...

Embodiment 3

[0037] The preparation method and steps of the zinc oxide-alumina composite carrier containing additives 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.

[0038] The composite support includes 17wt% zinc oxide containing zinc-aluminum spinel, the content of alumina is 80 wt%, and the contents of boron, potassium and strontium in the additive components are B 2 o 3 1.2 wt%, K 2 O 0.9 wt%, SrO 0.9 wt%. Composite carrier specific surface area 259m 2 / g.

[0039] Ammonium molybdate and cobalt nitrate were made into an impregnation solution, and ammonia water was added to adjust the pH value so that the salt was completely dissolved, and then the zinc oxide-alumina composite carrier surface-modified with auxiliary agents potassium and strontium was impregnated. T...

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Abstract

The invention relates to an additive-containing zinc oxide-aluminum oxide composite carrier and a preparation method. The composite carrier is prepared from components such as zinc aluminate gahnite-containing zinc oxide, aluminum oxide, and additive components boron, potassium and strontium, wherein components of the composite carrier are counted by the weight of oxides as follows: the content of aluminate gahnite-containing zinc oxide is 5 to 40 percent by weight, the content of aluminum oxide is 65 to 85 percent by weight, and the content of the additive components boron, potassium and strontium is respectively as follows: 0.5 to 1.5 percent by weight of B2O3, 0.3 to 2.5 percent by weight of K2O, and 0.2 to 2.5 percent by weight of SrO. The composite carrier is uniform in dispersion of zinc and aluminum and high in specific surface area.

Description

technical field [0001] The invention relates to a zinc oxide-alumina composite carrier containing additives and a preparation method thereof. The composite carrier can be used as an FCC catalyst sulfur reducing aid and an FCC hydrodesulfurization carrier. Background technique [0002] Spinel-type composite oxides are a kind of promising inorganic non-metallic materials, which have a series of good characteristics and are widely used in high-temperature materials, catalysts and catalyst supports and other fields. Composite materials of zinc oxide and alumina are often used as desulfurization catalytic materials in the fields of adsorption desulfurization and hydrodesulfurization. The common preparation methods of this material at home and abroad include impregnation method, mechanical mixing method, co-precipitation method and peptization method. Among them, since the impregnation method and the mechanical mixing method use alumina material as a precursor, by adjusting the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J32/00B01J23/887C10G45/08
CPCB01J23/06B01J23/8873C10G45/08C10G2300/202C10G2300/70
Inventor 牟晓红周艳青夏德强唐蓉萍田苗郑晓明王守伟
Owner LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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