Abstract
A low temperature calcined catalyst carrier which is composed of calcium aluminate, fused silica and titanium dioxide has been developed. This catalyst carrier is washcoatless because of its high specific surface area, and it is now being used commercially as a home-use catalyst.
The production method of the carrier is following: Carrier components in powder form are well mixed and then an adequate amount of water is added to the mixed powder to make the mixture paste for molding honeycomb. The curing of the molding is done in hot water and then the carrier is calcined at a low temperature range from 700 to 900°C.
The purpose of the present paper is to study the relationship between the carrier components and physical properties such as the compressive strength, the thermal expansion coefficient and the specific surface area.
The main results obtained are as follows:
1) The low temperature calcined catalyst carrier is practically usable at the temperature range from 400 to 1000°C.
2) Sintering of the carrier begins gradually above 700°C.
3) The thermal expansion coefficient of the carrier depends on the average particle size of fused silica used as the aggregate.
4) The thermal shrinkage of the carrier effectively depends on the average particle size of fused silica and thermal treatment temperature rather than the calcium aluminate content.
