Thin wall cordierite carrier for ceramic honeycomb catalyst and method for preparing the same

Abstract

The invention relates to the improvement on the ceramic beehive catalyst carrier, especially providing a ceramic beehive catalyst carrier with high mechanical strength and lower expansion parameter and preparing method. The invention is characterized in that: said beehive catalyst carrier is the alumina micro powder in 12-15%WT whose average particle diameter is less than 2 micron; the sheet kaolin and / or clay micro powder in 43-47% whose average particle diameter is less than 2 micron, the sheet steatite micro powder in 33-37% whose average particle diameter is 5-15 micron, and the fuse quartz in 6-12% whose average particle diameter is less than 2 micron to be mixed, molded and baked to attain the cordierite whose total amount is 92-96%, wherein, the Al203, MgO and SiO2 are each in 36-37%, 13.0-14.0% and 50-52%. The invention adds surface active agent in the mixture when in preparation. The prepared beehive cordierite total amount with 600 hole / square inch can reach 92-96%, the expansion parameter can reach 0.8X10-6 / Deg. C (800Deg. C to room temperature), and the factor of porosity can reach 39-40%. The invention can reduce the ignition temperature 25-40Deg. C, and reduce the tail gas discharge of nitrogen oxygen compound and carbon monoxide of vehicle 5-10% to meet the demand of Europe III standard.

Description

technical field [0001] The invention relates to the improvement of a ceramic honeycomb catalyst carrier, in particular to a ceramic honeycomb catalyst carrier with high mechanical strength and low expansion coefficient, which can meet the requirements of the European III standard of automobile exhaust emission and a preparation method thereof. Background technique [0002] The honeycomb ceramic catalyst carrier is the main body of the automobile exhaust gas catalytic purifier. The ceramic with cordierite as the main crystal phase has always been the preferred material for the honeycomb ceramic catalyst carrier due to its low thermal expansion performance. 2 O 3 ·5SiO 2 as the basic composition. With the increasing requirements for environmental protection worldwide, more stringent Euro III standards have been proposed for vehicle exhaust emissions. Existing cordierite 400 holes / square inch honeycomb ceramic catalyst carrier, the amount of cordierite obtained is usually on...

AI Technical Summary

Problems solved by technology

However, each method has its certain limitations, and it is difficult to control in actual industrial production, so it is difficult to be directly used in industrial production.

For example, fine alumina with an average particle size of no more than 2 microns, although it has the advantage of reducing the thermal expansion coefficient, is difficult to disperse evenly due to the small particles and easy agglomeration, and will cause the porosity of the honeycomb body to decrease, etc.