Honeycomb ceramic carrier and preparation method thereof

A honeycomb ceramic carrier and raw material technology, applied in ceramic products, other household utensils, applications, etc., can solve the problems of insufficient pore size, small pitch, and reduced reaction and diffusion speed

Active Publication Date: 2013-12-18
BEIJING ZHONGAN SIHAI ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a catalyst carrier, in many cases, the catalyst carrier material is required to have a large The porosity and suitable pore diameter, such as the removal of nitrogen oxides in some diesel engines, require the honeycomb ceramic carrier to have a relatively large pore diameter with an average pore diameter of more than 20 microns, and require a porosity of more than 55%. At present Cordierite honeycomb ceramics at home and abroad are basically unable to achieve a pore size higher than 16 microns
[0003] At present, the best quality honeycomb ceramics produced at home and abroad are Corning Corporation of the United States and NGK Corporation of Japan. The patent CN1856398A applied by Corning Corporation discloses a high-porosity honeycomb ceramic body and a preparation method. The method prepares a porosity of 45- Between 75%, preferably a high-porosity honeycomb ceramic carrier with a porosity between 50-65%, but the wall thickness of this kind of honeycomb ceramic is less than 0.2 mm, mainly suitable for 400 holes / square inch to 900 holes / square inch , the pitch is very small, and its pore size distribution is 2-10 microns, the pore size is not large enough to meet the requirements of some catalysts that need to use honeycomb ceramics with a large pitch and a large pore size and high porosity structure as a carrier

Method used

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  • Honeycomb ceramic carrier and preparation method thereof
  • Honeycomb ceramic carrier and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Take by weighing 45kg of talc, 20kg of alumina, 8kg of aluminum hydroxide, 15kg of silica powder, 8kg of kaolin, 5kg of methylcellulose as a surfactant, and 8kg of 325 mesh cornstarch as a pore-forming agent. Mix well in a mixer.

[0024] Weigh 2 kg of glycerin and 2 kg of soybean oil as a lubricant, add them together with 30 kg of deionized water into the above-mentioned mixed powder, and stir evenly to obtain the mud for honeycomb ceramic carrier.

[0025] The mud was aged at 20°C for 24 hours, extruded into a honeycomb ceramic green body with a wall thickness of 0.6mm and 50 holes / square inch, and then calcined at 1400°C after microwave drying.

[0026] The obtained honeycomb ceramic carrier has a median pore size of 24 μm and a porosity of 56%.

Embodiment 2

[0028] Weigh 35kg talc, 25kg alumina, 10kg aluminum hydroxide, 20kg silica powder, 10kg kaolin, weigh 1kg polyethylene oxide, 2kg polyvinyl alcohol as surfactant, weigh 10kg 325 mesh graphite powder as pore-forming agent, mix various raw materials in a mixer evenly.

[0029] Weigh 2kg of glycerin and 3kg of tung oil as a lubricant, add them together with 28kg of deionized water into the above-mentioned mixed powder, and stir evenly to obtain the mud for honeycomb ceramic carrier.

[0030] The mud was aged at 20°C for 24 hours, extruded into a honeycomb ceramic green body with a wall thickness of 0.9 and 40 holes / square inch, dried by microwaves, and then calcined at 1410°C.

[0031] The obtained honeycomb ceramic carrier has a median pore diameter of 35 μm and a porosity of 65%.

Embodiment 3

[0033] Weigh 40kg talc, 20kg alumina, 15kg aluminum hydroxide, 15kg silica powder, 10kg kaolin, weigh 2kg polyethylene oxide, 2kg hydroxypropyl methylcellulose as surfactant, weigh 10kg 200 mesh starch As a pore-forming agent, mix various raw materials in a mixer evenly.

[0034] Weigh 2 kg of tung oil and 2 kg of palm oil as lubricants, add them together with 25 kg of deionized water into the above-mentioned mixed powder, and stir evenly to obtain mud for honeycomb ceramic carrier.

[0035] The mud was aged at 20°C for 24 hours, extruded into a honeycomb ceramic body with a wall thickness of 0.8 and 40 holes / square inch, dried by microwave, and calcined at 1420°C.

[0036] The porosity and pore size of the honeycomb carrier were measured by mercury porosimeter mercury intrusion method, and the median pore size of the honeycomb ceramic carrier was measured to be 40 μm, and the porosity was 63%.

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Abstract

The invention discloses a honeycomb ceramic carrier with large aperture and high porosity, and a preparation method thereof. The diameters of holes of the honeycomb ceramic carrier are 15-40 microns; the porosity is 40-65%. The honeycomb ceramic carrier is prepared from the following raw materials: 30-50 parts of soapstone, 20-30 parts of aluminum oxide, 5-10 parts of aluminium hydroxide, 10-20 parts of silicon oxide, 5-10 parts of kaoline, a surfactant, a binder and a pore forming agent.

Description

technical field [0001] The invention belongs to the field of honeycomb ceramic carriers for catalysts, and relates to a honeycomb ceramic carrier with a large aperture and high porosity used for loading various catalysts and a preparation method thereof. Background technique [0002] As a porous ceramic product, honeycomb ceramics have a large number of honeycomb parallel channels through the crown. Compared with general ceramic products, honeycomb ceramics have become ideal carriers for catalysts for various purposes due to their high thermal shock resistance, high mechanical strength, low thermal expansion coefficient, and large specific surface area. Cordierite honeycomb ceramics are currently the most widely used honeycomb ceramic materials for catalysts. However, as a catalyst carrier, in many cases, the catalyst carrier material is required to have a large The porosity and suitable pore diameter, such as the removal of nitrogen oxides in some diesel engines, require ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/20C04B35/622
Inventor 马少丹姜海英梅天放左方圆张雷
Owner BEIJING ZHONGAN SIHAI ENERGY
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