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Preparation method of ceramic block body with hierarchical pore structure by using bacterial cellulose as biological template

A bacterial cellulose, biological template technology, applied in ceramic products, household appliances, other household appliances, etc., to achieve high mass transfer capacity, beneficial to recycling and reuse, and good mechanical strength.

Active Publication Date: 2018-06-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although scholars at home and abroad have carried out a lot of research in the fields of capacitors, composite materials, and sensors based on bacterial cellulose in recent years, there are few reports on the application of bacterial cellulose in hierarchical porous ceramic templates.

Method used

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  • Preparation method of ceramic block body with hierarchical pore structure by using bacterial cellulose as biological template
  • Preparation method of ceramic block body with hierarchical pore structure by using bacterial cellulose as biological template
  • Preparation method of ceramic block body with hierarchical pore structure by using bacterial cellulose as biological template

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Using bacterial cellulose as a biological template to prepare a ceramic block with a hierarchical porous structure, specifically includes the following steps:

[0040] (1) Soak the hydrogel of bacterial cellulose in a zirconia precursor aqueous solution with a concentration of 0.1 g / mL for 48 hours;

[0041] (2) Transfer the bacterial cellulose gel soaked in the aqueous solution of the zirconia peroxide precursor to a container, then place the container at -40°C for freezing, and the freezing time is 24 hours;

[0042] (3) Place the frozen bacterial cellulose gel in a freeze dryer, the freezing temperature of the freeze dryer is -50°C, and the freeze drying time is 24 hours;

[0043] (4) The freeze-dried sample is placed in an oven for curing, the curing temperature and curing time are 200°C and 2 hours respectively; after curing, the sample is stored in a desiccator;

[0044](5) Sinter the sample solidified in step (4), the sintering atmosphere is air, the temperature...

Embodiment 2

[0047] Using bacterial cellulose as a biological template to prepare a ceramic block with a hierarchical porous structure, specifically includes the following steps:

[0048] (1) Soak the hydrogel of bacterial cellulose in an aqueous solution of zirconia precursor with a concentration of 0.2g / mL, and the soaking time is 48 hours;

[0049] (2) The bacterial cellulose gel soaked in the aqueous solution of the zirconia peroxide precursor is transferred to the container, and then the container is placed under liquid nitrogen for freezing, and the freezing time is 15 minutes;

[0050] (3) Place the frozen bacterial cellulose gel in a freeze dryer, the freezing temperature of the freeze dryer is -50°C, and the freeze drying time is 48 hours;

[0051] (4) The freeze-dried sample is placed in an oven for curing, the curing temperature and curing time are 200°C and 2 hours respectively; after curing, the sample is stored in a desiccator;

[0052] (5) Sinter the sample solidified in st...

Embodiment 3

[0056] Using bacterial cellulose as a biological template to prepare a ceramic block with a hierarchical porous structure, specifically includes the following steps:

[0057] (1) Soak the hydrogel of bacterial cellulose in an aqueous solution of titanium oxide precursor with a concentration of 0.2 g / mL for 48 hours;

[0058] (2) Transfer the bacterial cellulose gel soaked in the titanium peroxide precursor aqueous solution to a container, and then place the container at -40°C for freezing, and the freezing time is 24 hours;

[0059] (3) Place the frozen bacterial cellulose gel in a freeze dryer, the freezing temperature of the freeze dryer is -50°C, and the freeze drying time is 24 hours;

[0060] (4) The freeze-dried sample is placed in an oven for curing, the curing temperature and curing time are 200°C and 2 hours respectively; after curing, the sample is stored in a desiccator;

[0061] (5) The sample solidified in step (4) is sintered once, the sintering atmosphere is ar...

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Abstract

The invention discloses a preparation method of a ceramic block body with a hierarchical pore structure by using bacterial cellulose as a biological template. The preparation method takes bacterial cellulose as the biological template on the basis of bacterial cellulose and a polymer ceramic precursor; the ceramic precursor provides various elements required to form the ceramic block body; by using the freeze-drying technology and a fine control sintering process, the ceramic block body with the hierarchical pore used as catalyst, catalyst carrier or heat isolating material can be prepared. The ceramic block body prepared by the method can well copy the fixed hierarchical pore structure of the bacterial cellulose, provides a big specific area and high mass transfer ability; meanwhile, theceramic block body is easy to separate from a reaction system, so it can be applied as the ideal catalyst and catalyst carrier.

Description

technical field [0001] The invention relates to the technical field of preparation of a multi-level porous ceramic block, in particular to a preparation method of a multi-level porous ceramic block used for a catalyst and a catalyst carrier. Background technique [0002] In recent years, with the advancement of science and technology, the enhancement of environmental protection awareness and the increase of demand for chemical raw materials, catalysts and catalyst carriers have played an increasingly important role in the chemical industry. Among them, porous oxide ceramics such as alumina, zirconia, and titania have received more and more attention because of their specific good thermal stability, excellent catalytic activity or catalytic activity. In addition to the above-mentioned advantages, an ideal catalyst and catalyst carrier should also have a large specific surface area and high mass transfer capacity, which can not only provide a larger reaction space, but also ac...

Claims

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Application Information

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IPC IPC(8): C04B38/06
CPCC04B38/0615C04B2235/3217C04B2235/3232C04B2235/3244C04B2235/3258C04B2235/483C04B2235/486C04B2235/6567C04B2235/77C04B2235/96C04B35/48C04B38/0067C04B35/46
Inventor 张勃兴邱文丰赵彤
Owner SOUTH CHINA UNIV OF TECH
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