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
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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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