A preparing method and an application for a mixed oxide of alkaline earth metal or lanthanide metal M and aluminium oxide

A technology of mixed oxides and lanthanide metals, which is applied in the preparation of alkaline earth metal aluminate/alumina/aluminum hydroxide, rare earth metal compounds, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems that cannot Meet the requirements of catalyst performance and other issues, and achieve the effect of stable performance, excellent stability and large specific surface area

Inactive Publication Date: 2018-10-09
單岩崑
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The optional geometric structure and physical properties of industrial alumina materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1, Co-precipitation method to prepare a mixed oxide support with a lanthanum-aluminum ratio of 1:30

[0026]Weigh an appropriate amount of lanthanum nitrate hexahydrate and aluminum nitrate nonahydrate reagents according to the molar ratio of lanthanum to aluminum atoms of 1:30, and configure it into a uniform mixed solution, using excess ammonia solution as a precipitant, at 5-85 °C, Add the lanthanum-aluminum mixed solution to the constantly stirring ammonia solution, and confirm that the pH value of the suspension is above 9 after the addition is completed. Stirring was continued to allow the solid precipitate to age in the mother liquor for 5 hours. Then, filter and wash until the washing liquid is neutral. The filter cake was dried overnight at 120°C for 12 hours. The dried solid was crushed into a powder with a mortar and pestle.

[0027] ●Take the above dried solid powder and calcinate at 800°C for 2 hours to obtain sample 1-1;

[0028] ●Take the abov...

Embodiment 2

[0036] Example 2, preparation of a mixed oxide support with a lanthanum-aluminum ratio of 1:3 by coprecipitation

[0037] Weigh an appropriate amount of lanthanum nitrate hexahydrate and aluminum nitrate nonahydrate reagents according to the molar ratio of lanthanum to aluminum atoms of 1:3, and configure it into a uniform mixed solution, using excess ammonia solution as a precipitant, at 5-85 °C, Add the lanthanum-aluminum mixed solution to the constantly stirring ammonia solution, and confirm that the pH value of the suspension is above 9 after the addition is completed. Stirring was continued to allow the solid precipitate to age in the mother liquor for 5 hours. Then, filter and wash until the washing liquid is neutral. The filter cake was dried overnight at 120°C for 12 hours. The dried solid was crushed into a powder with a mortar and pestle.

[0038] ●Take the above dried solid powder and calcinate at 800°C for 2 hours to obtain sample 2-1;

[0039] ●Take the above ...

Embodiment 3

[0046] Example 3, Co-precipitation method to prepare a mixed oxide carrier with a magnesium-aluminum ratio of 1:5

[0047] Magnesium aluminum spinel (MgAl 2 o 4 ) is a very good refractory material with high melting point, high strength, high hardness and high thermal conductivity. Its melting point is as high as 2135°C. However, the complete spinel phase prepared by co-precipitation method according to the magnesium aluminum spinel structure has a small specific surface area (2 / g), limiting its application potential as a catalyst support.

[0048] This example draws lessons from the preparation technology of lanthanum-aluminum mixed oxide, according to the magnesium-aluminum spinel (MgAl 2 o 4 ) The atomic ratio of magnesium to aluminum is Mg:Al=1:2, and the raw material ratio of Mg:Al=1:3-1:10 is selected to prepare a mixed oxide containing alumina phase and magnesium aluminum spinel mixture phase , using the characteristics that alumina is easy to form a large surface...

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Abstract

The invention provides a preparing method for a mixed oxide of alkaline earth metal or lanthanide metal M and aluminium oxide. The method includes the following steps: a soluble salt solution of aluminum and a soluble salt solution of alkaline earth or lanthanide metal M are weighed and then mixed; a precipitating agent is added into the mixing solution, and the precipitation reaction is under thecondition of 5-85 DEG C; the obtained solid suspension is aged for 0.1-8 hours and then filtered and washed; the obtained sediment is dried under 80-150 DEG C for 2-20 hours; the sediment after drying is calcinated under 800 DEG C for 0.5-12 hours at a constant temperature; the temperature is raised to 1200 DEG C, the calcination is continued for 1-24 hours; the temperature is reduced to the roomtemperature, and the mixing oxide composed of MAlxOy and Al2O3 is obtained. The obtained mixing oxide of MAlxOy and aluminium oxide has the heat stability of MAlxOy, the characteristic of aluminium oxide which can easily form a porous structure is realized, the load active substance of rhodium, platinum and the like are loaded on the mixing oxide, and a load high efficiency natural gas selectingoxidation catalyst with excellent stability and high temperature resistance can be obtained.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a preparation method and application of a mixed oxide of alkaline earth metal or lanthanide metal M and alumina. Background technique [0002] Petroleum and coal, as traditional fossil resources, have been important resources supporting the industrialization progress of human society for more than 100 years. However, in recent years, oil reserves have gradually declined, and a large amount of greenhouse gases produced after the use of coal energy, such as carbon dioxide, nitrogen oxides, sulfur oxides, etc., have caused global warming and smog, prompting the energy and chemical industry to begin to seek renewable energy such as Solar energy, wind energy, biomass, etc. can replace the utilization of petroleum, coal, etc. The opening and utilization of methane, which has the least environmental pollution among fossil energy sources, has also attracted more and more attention. ...

Claims

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Application Information

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IPC IPC(8): B01J21/10B01J23/10B01J23/63C01F7/16C01F17/00C01B3/40
CPCB01J21/005B01J21/10B01J23/10B01J23/63B01J35/0066B01J35/1014B01J35/1019B01J37/024B01J37/03C01B3/40C01B2203/1064C01B2203/107C01B2203/1082C01F7/162C01F17/206Y02P20/52
Inventor 单岩崑郭飞
Owner 單岩崑
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