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Honeycomb carrier, and preparation method and application thereof

A honeycomb carrier, honeycomb technology, applied in the field of catalysis, can solve the problems of high mechanical strength and thermal shock, low thermal expansion, small size, etc., to improve moisturizing performance and lubricating performance, increase plasticity and adhesion, and reduce cracking effect of the problem

Active Publication Date: 2020-04-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method prepares cordierite honeycomb ceramics, but cordierite honeycomb ceramics has low thermal expansion, high mechanical strength and thermal shock resistance. Although it can be widely used in mobile source exhaust gas treatment, its adsorption is poor and its size Small, low porosity and high calcination temperature, high production cost
During the preparation of coated catalytically active materials, it is difficult to increase the loading of catalytic adsorption materials, resulting in poor catalytic performance of the obtained honeycomb catalysts

Method used

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  • Honeycomb carrier, and preparation method and application thereof
  • Honeycomb carrier, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] This embodiment provides a preparation method of a honeycomb carrier, the preparation method comprising the following steps:

[0089] (1) Mix the first raw material and the second raw material in the mixer to obtain mixed powder, the particle size D90 of the first raw material is 100-150 μm, and the specific surface area of ​​each composition is 50-100 μm 2 / g;

[0090] (2) Stir the mixed water, the first organic molding additive and the mixed powder obtained in step (1) at a speed of 650r / min at 85°C for 1.5 hours; reduce the stirring speed to 200r / min and then add the second organic molding Auxiliary and structural enhancer, continue stirring at 40°C; then reverse stirring until the moisture content of the mud is 25%;

[0091] (3) The sludge obtained in the kneading step (2) is naturally cooled during the kneading process. When the temperature of the sludge is lowered to 40°C, the sludge after kneading is pre-extruded, and the screen mesh used for pre-extrusion is 80...

Embodiment 2

[0102] This embodiment provides a preparation method of a honeycomb carrier, the preparation method comprising the following steps:

[0103](1) Mix the first raw material and the second raw material in the mixer to obtain mixed powder, the particle size D90 of the first raw material is 120-180 μm, and the specific surface area of ​​each composition is 80-150 μm 2 / g;

[0104] (2) Stir the mixed water, the first organic molding additive and the mixed powder obtained in step (1) at a speed of 600r / min at 90°C for 1.8 hours; reduce the stirring speed to 150r / min and then add the second organic molding Auxiliary and structural enhancer, continue stirring at 38°C; then reverse stirring until the moisture content of the mud is 22%;

[0105] (3) The sludge obtained in the kneading step (2) is naturally cooled during the kneading process. When the temperature of the sludge is lowered to 35°C, the sludge after kneading is pre-extruded, and the screen mesh used for the pre-extrusion is...

Embodiment 3

[0116] This embodiment provides a preparation method of a honeycomb carrier, the preparation method comprising the following steps:

[0117] (1) Mix the first raw material and the second raw material in the mixer to obtain mixed powder, the particle size D90 of the first raw material is 150-200 μm, and the specific surface area of ​​each composition is 50-80 m 2 / g;

[0118] (2) Stir the mixed water, the first organic molding additive and the mixed powder obtained in step (1) at a speed of 700r / min at 80°C for 1.2 hours; reduce the stirring speed to 100r / min and then add the second organic molding Auxiliary and structural enhancer, continue stirring at 42°C; then reverse stirring until the moisture content of the mud is 28%;

[0119] (3) Kneading the mud obtained in step (2), the mud is naturally cooled during the kneading process, when the mud is cooled to 25°C, the mud after kneading is pre-extruded, and the screen mesh used for pre-extrusion is 90 mesh ;

[0120] (4) The...

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Abstract

The invention provides a honeycomb carrier, and a preparation method and an application thereof. The preparation method comprises the following steps: mixing a first raw material and a second raw material to obtain a mixed powder; mixing water, a first organic forming aid and the mixed powder under a stirring condition, reducing the stirring speed, and then sequentially adding a second organic forming aid and a structure enhancer to obtain pug; kneading the pug, and then carrying out pre-extrusion on the kneaded pug; aging the pre-extruded pug, and then extruding the aged pug in vacuum to obtain a honeycomb green body; drying the honeycomb green body until the moisture content is less than 10%, and then drying until the moisture content is less than 3% to obtain a dried green body; and roasting and drying the green body to obtain the honeycomb carrier. The prepared honeycomb carrier is large in porosity and high in adsorption capacity, can load many catalytic active components, and hasa high catalytic effect in the same space.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a catalytic carrier and its preparation method and application, in particular to a honeycomb carrier and its preparation method and application. Background technique [0002] With the improvement of the country's requirements for the treatment of gas pollutants, more and more industrial waste gases need to be removed by catalysis or adsorption. The adsorption catalysts for the removal of these industrial waste gases usually use regular honeycomb materials as carriers, and active catalysts are carried out on the catalyst surface. coating, so as to prepare a structured catalyst with high activity. The performance of the carrier has a great influence on the performance of the final catalyst. How to prepare a honeycomb carrier with strong adsorption capacity, large size, high strength and low cost has become a constraint for large-scale exhaust gas adsorption catalysis. key factors t...

Claims

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Application Information

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IPC IPC(8): B01J21/16B01J37/08B01J32/00B01J35/04
CPCB01J21/16B01J37/08B01J35/56
Inventor 余剑李长明许启成高士秋李剑玲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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