Method for synthesizing high-specific surface area nano-lanthanum ferrous acid with mesoporous silicon dioxide as mould plate

A technology of mesoporous silica and high specific surface area, applied in chemical instruments and methods, iron compounds, rare earth metal compounds, etc., can solve the problem of low specific surface area of ​​lanthanum ferrite, and achieve low cost, catalytic and adsorption performance The effect of improvement and simple process

Inactive Publication Date: 2010-06-16
南通国邦科技发展有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low specific surface area of ​​existing lanthanum ferrite, and to provide a method for synthesizing high specific surface area nanometer lanthanum ferrite using mesoporous silica as a template

Method used

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  • Method for synthesizing high-specific surface area nano-lanthanum ferrous acid with mesoporous silicon dioxide as mould plate
  • Method for synthesizing high-specific surface area nano-lanthanum ferrous acid with mesoporous silicon dioxide as mould plate
  • Method for synthesizing high-specific surface area nano-lanthanum ferrous acid with mesoporous silicon dioxide as mould plate

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specific Embodiment approach 1

[0008] Specific embodiment one: in the present embodiment, take mesoporous silica as template and synthesize the method for high specific surface area nanometer lanthanum ferrite is to realize according to the following steps: one, La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O was added in absolute ethanol at a molar ratio of 1:1 to obtain a mixed solution (red-brown homogeneous solution), wherein La in the mixed solution 3+ The concentration is 2.5mol / L, Fe 3+ The concentration is 2.5mol / L; 2. Under the condition of stirring, quickly add the pretreated mesoporous silica powder to the mixed solution obtained in step 1. Thick, then dried at 80-100°C for 20-30 hours, and ground to nanoscale; 3. Roast the ground solid at 500-900°C for 1.5-4 hours, and cool to room temperature; 4. After cooling The solid is added to the sodium hydroxide solution, stirred in a water bath at 80-100°C for 4-6 hours, then centrifuged, and washed three to five times with double distilled water; 5. T...

specific Embodiment approach 2

[0010] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the pretreatment method of the mesoporous silica powder in step 2 is as follows: under the condition of 80-100°C, heat the mesoporous silica powder for 4-6 Hour. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: This embodiment differs from Embodiment 1 in that the mesoporous silica powder in step 2 is mesoporous silica SBA-16 or mesoporous silica SBA-15. Others are the same as in the first embodiment.

[0012] The mesoporous silica powder in this embodiment is commercially available or synthesized according to the method in the literature.

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Abstract

The invention discloses a method for synthesizing nanometer lanthanum ferrite with a high specific surface area by using mesoporous silicon dioxide as a template, which relates to a method for synthesizing the nanometer lanthanum ferrite. The method solves the problem that the prior lanthanum ferrite has a low specific surface area. The method has the following steps that: 1. La(NO3)3.6H2O and Fe(NO3)3.9H2O are added into absolute ethyl alcohol to produce a mixed solution; 2. pretreated mesoporous silicon dioxide powder is quickly added into the mixed solution, stirred at constant temperature,dried and ground; 3. the baking and the cooling are performed; 4. the cooled solid is added into a sodium hydroxide solution, stirred in water bath, centrifugally separated, and washed; and 5. the nanometer lanthanum ferrite can be prepared by drying and baking. The synthesis process has simple process, convenient operation, low cost, and easiness for realization of industrialized production. Thespecific surface area of the nanometer lanthanum ferrite synthesized by the method is between 34.5307 and 129.672m<2> / g. Compared with the citric acid complexing method, the specific surface area ofa product synthesized by the method is increased by more than three times; at the same time, the performances such as catalysis and absorption and so on, are apparently improved.

Description

technical field [0001] The invention relates to a synthesis method of nanometer lanthanum ferrite. Background technique [0002] Nano-lanthanum ferrite is a new type of material with unique physical and chemical properties, mostly used in CO, NH 3 、CH 4 Theoretically, it is an ideal product for studying the catalyst surface and catalytic performance. Due to the defects of particle agglomeration and uncontrollable particle size in traditional synthesis methods (such as citric acid complexation, etc.), the specific surface area is reduced, which seriously affects its catalytic performance. Contents of the invention [0003] The purpose of the present invention is to solve the problem of low specific surface area of ​​the existing lanthanum ferrite, and provide a method for synthesizing nano-lanthanum ferrite with high specific surface area using mesoporous silica as a template. The invention uses the mesoporous silicon dioxide as a template, improves the specific surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00C01F17/00
Inventor 井立强苏海娇付宏刚
Owner 南通国邦科技发展有限公司
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