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Method for preparation of three-dimensional ordered macroporous Ce-Zr material by using PMMA as template

A three-dimensional ordered, ce-zr technology, applied in the field of material chemistry, can solve the problems of poor thermal stability, small specific surface area, and no special structure, etc., to achieve excellent heat dissipation performance, large specific surface area, improved catalytic activity and production efficiency rate effect

Active Publication Date: 2013-11-27
KUNMING UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional methods of synthesizing Ce-Zr solid solution include co-precipitation method, hydrothermal method, sol-gel and mechanical mixing method, etc., but the materials synthesized by these methods do not have a special structure, the specific surface area is small, and the thermal stability is very poor. , easy to sinter at high temperature

Method used

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  • Method for preparation of three-dimensional ordered macroporous Ce-Zr material by using PMMA as template
  • Method for preparation of three-dimensional ordered macroporous Ce-Zr material by using PMMA as template
  • Method for preparation of three-dimensional ordered macroporous Ce-Zr material by using PMMA as template

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) According to the molar ratio of Ce ion and Zr ion is 3:1, mix cerium nitrate and zirconium nitrate, then add deionized water to prepare a solution with a concentration of 0.1mol / L;

[0028] (2) According to the mass ratio of metal salt (cerium nitrate and zirconium nitrate): citric acid = 1:1.5, add citric acid to the solution in step (1), and stir at a constant temperature of 800r / min at 30°C for 40 minute;

[0029] (3) According to the mass ratio of PMMA: metal salt (cerium nitrate and zirconium nitrate) = 1:1, add the PMMA template to the solution in step (2) for mixing;

[0030] (4) The mixed solution in step (3) was left to stand at room temperature for 3 hours, and then dried at 90°C for 24 hours to obtain the crude product to remove the water therein;

[0031] (5) Heating the crude product obtained in step (4) to 500°C at a heating rate of 2°C / min and then holding the temperature for 3 hours to obtain a three-dimensional ordered macroporous Ce-Zr material; ...

Embodiment 2

[0037] (1) According to the molar ratio of Ce ion and Zr ion is 9:1, mix cerium nitrate and zirconium nitrate, then add deionized water to prepare a solution with a concentration of 0.5mol / L;

[0038] (2) According to the mass ratio of metal salt (cerium nitrate and zirconium nitrate): citric acid = 1:1.2, add citric acid to the solution in step (1), and stir at a constant temperature of 1000r / min at 20°C for 30 minute;

[0039] (3) According to the mass ratio of PMMA: metal salt (cerium nitrate and zirconium nitrate) = 1:2, add the PMMA template to the solution in step (2) for mixing;

[0040] (4) The mixed solution in step (3) was left to stand at room temperature for 4 hours, and then placed at 60°C for 20 hours at a constant temperature to obtain the crude product to remove the water therein;

[0041] (5) The crude product obtained in step (4) was heated to 450°C at a heating rate of 2°C / min, and then kept at a constant temperature for 4 hours to obtain a three-dimensiona...

Embodiment 3

[0047](1) According to the molar ratio of Ce ions and Zr ions as 1:1, mix cerium nitrate and zirconium nitrate, and then add deionized water to prepare a solution with a concentration of 1mol / L;

[0048] (2) According to the mass ratio of metal salt (cerium nitrate and zirconium nitrate): citric acid = 1:1, add citric acid to the solution in step (1), and stir at a constant temperature of 300r / min at 90°C for 60 minute;

[0049] (3) According to the mass ratio of PMMA: metal salt (cerium nitrate and zirconium nitrate) = 1:3, add the PMMA template to the solution in step (2) for mixing;

[0050] (4) The mixed solution in step (3) was left to stand at room temperature for 2 hours, then placed at 30°C and dried at a constant temperature for 12 to 24 hours to obtain the crude product to remove the water therein;

[0051] (5) The crude product obtained in step (4) was heated to 600°C at a heating rate of 2°C / min and then kept at a constant temperature for 2 hours to obtain a three...

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Abstract

The invention provides a method for preparation of a three-dimensional ordered macroporous Ce-Zr material by using PMMA as a template. The method is as below: mixing cerium nitrate and zirconium nitrate, and adding deionized water to prepare a solution; adding citric acid, stirring at 20-90 DEG C, and adding a PMMA template and mixing; standing at normal temperature, drying at 30-90 DEG C for 12-24 h to obtain a crude product, and removing the moisture in the crude product; and heating the crude product to 450-600 DEG C and maintaining a constant temperature for 2-4 h to obtain the three-dimensional ordered macroporous Ce-Zr material. The material has great specific surface area, excellent heat radiation performance, and large and uniform apertures arranging in a three-dimensional ordered state, so that reactants can arrive the active site easily; the macropores are connected through hole windows to form an open three-dimensional macroporous network structure; and the above structure characteristics are beneficial to contact, diffusion and transmission of substances in the 3 DOM material. The material can be applied to methane steam reforming hydrogen production and synthetic gas technology, so as to substantially increase catalytic activity and yield of the reaction.

Description

technical field [0001] The invention relates to a method for preparing a macroporous cerium-zirconium solid solution by using colloidal microspheres as a template, belonging to the technical field of material chemistry. Background technique [0002] Three-dimensional ordered macroporous (3DOM) materials not only have the large pore diameter of general macroporous materials, but also have uniform pore diameter, orderly arrangement of channels, and pore walls composed of nanoparticles. It is a new type of macroporous catalyst, adsorbent, chromatographic material and Microbial carrier is an optimized photonic crystal because of its highly ordered spatial lattice structure. Therefore, it has attracted extensive attention from the chemical and physical circles at home and abroad, and has developed rapidly in recent years. The main way to prepare ordered macroporous materials is template technology. [0003] Currently, a variety of templates have been developed for pores of diffe...

Claims

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Application Information

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IPC IPC(8): C22C1/08B01J23/10
Inventor 祝星郑燕娥王华魏永刚李孔斋王禹皓
Owner KUNMING UNIV OF SCI & TECH
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