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Method for preparing three-dimensional ordered macroporous praseodymium oxide and terbium oxide with mesoporous walls

A three-dimensional ordered, mesoporous technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., to achieve the effects of easy availability of raw materials, simple preparation process, and controllable product particle morphology

Inactive Publication Date: 2011-03-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there is no domestic and foreign literature and patent report on the preparation of three-dimensional ordered macroporous structure of Pr 6 o 11 and Tb 4 o 7 Methods

Method used

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  • Method for preparing three-dimensional ordered macroporous praseodymium oxide and terbium oxide with mesoporous walls
  • Method for preparing three-dimensional ordered macroporous praseodymium oxide and terbium oxide with mesoporous walls

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: take by weighing 1.71g sucrose and be dissolved in (40wt%) in 10g methanol aqueous solution, add 2.1g citric acid and 4.35g Pr(NO 3 ) 3 ·6H 2 O, a homogeneous solution was formed after magnetic stirring for 1 h, which was the precursor solution. The precursor solution was poured into a 50 mL beaker containing 3.0 g of polymethylmethacrylate (PMMA) hard template. In order to maintain the original orderly arrangement structure of PMMA, no stirring was performed during the pouring of the precursor solution. The precursor solution was impregnated with PMMA for about 5 hours and then suction filtered. The obtained sample was dried at room temperature for 24 hours and then loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 200°C at a rate of 1°C / min and kept at this temperature for 3h. After the temperature dropped to 30°C, the magnetic boat was taken out and placed ...

Embodiment 2

[0016] Embodiment 2: take by weighing 1.46g L-lysine and be dissolved in (40wt%) in 10g methanol aqueous solution, add 2.1g citric acid and 4.35g Pr(NO 3 ) 3 ·6H 2 O, a homogeneous solution was formed after magnetic stirring for 1 h, which was the precursor solution. The precursor solution was poured into a 50 mL beaker containing 3.0 g of polymethylmethacrylate (PMMA) hard template. In order to maintain the original orderly arrangement structure of PMMA, no stirring was performed during the pouring of the precursor solution. The precursor solution was impregnated with PMMA for about 5 hours and then suction filtered. The obtained sample was dried at room temperature for 24 hours and then loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 200°C at a rate of 1°C / min and kept at this temperature for 3h. After the temperature dropped to 30°C, the magnetic boat was taken out and placed...

Embodiment 3

[0017] Embodiment 3: take by weighing 1.71g sucrose and be dissolved in (40wt%) in 10g methanol aqueous solution, add 2.1g citric acid and 4.53g Tb(NO 3 ) 3 ·6H 2 O, a homogeneous solution was formed after magnetic stirring for 1 h, which was the precursor solution. The precursor solution was poured into a 50 mL beaker containing 3.0 g of polymethylmethacrylate (PMMA) hard template. In order to maintain the original orderly arrangement structure of PMMA, no stirring was performed during the pouring of the precursor solution. The precursor solution was impregnated with PMMA for about 5 h and then suction filtered. The obtained sample was dried at room temperature for 24 h and then loaded into a magnetic boat and placed in a tube furnace. The temperature was raised to 200°C and kept at this temperature for 3 hours. After the temperature dropped to 30°C, the magnetic boat was taken out and placed in a muffle furnace, and raised to 300°C at a rate of 1°C / min and kept at this te...

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Abstract

The invention discloses a method for preparing three-dimensional ordered macroporous praseodymium oxide and terbium oxide with mesoporous walls. In the method, a polymethyl methacrylate microsphere (PMMA) micro-balloon is utilized as a hard template, sucrose or L-lysine is utilized as an additive, citric acid is utilized as a complexing agent, and methanol and water are utilized as solvents. The method comprises the following steps: immersing the PMMA hard template in a mixed solution containing the above reagents and soluble metal salts, and adopting a two-step roasting method to prepare three-dimensional ordered macroporous Pr6IO11 and Tb4O7 with mesoporous walls, wherein the two-step roasting method refers to the step of roasting in nitrogen and the step of roasting in air in turn. The introduction of sucrose or L-lysine and the step of roasting in nitrogen play an important role in forming the mesoporous walls of the three-dimensional ordered macroporous Pr6IO11 and Tb4O7. The invention has cheap and easily obtained raw materials, simple preparation process and controllable appearance and size of product particles.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional ordered macroporous rare earth oxide with mesoporous walls, in particular to the preparation of a three-dimensional ordered macroporous rare earth oxide Pr 6 o 11 and Tb 4 o 7 The method belongs to the technical field of rare earth oxides. Background technique [0002] Due to their unique 4f electronic structure, large atomic magnetic moment, strong spin-orbit coupling and other characteristics, rare earth oxides show good catalytic and catalytic performance during chemical reactions, and are used in automobile exhaust purification, Industrial organic waste gas and indoor air purification, catalytic combustion and fuel cells and other fields. Due to their high specific surface area, large pore volume and well-developed pore structure, porous rare earth oxides can reduce mass transfer resistance and promote guest molecules to reach active sites, which is conducive to the activation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 戴洪兴张晗刘雨溪吉科猛石凤娟张磊邓积光
Owner BEIJING UNIV OF TECH