Action of gaseous atmospheres and temperature on the properties of aluminosilicate refractories saturated with nickel catalyst

Conclusions Kaolin and kyanite-sillimanite refractories during heating in hydrogen up to 1500°C sinter intensely, as a result of which there is a sharp reduction in the porosity, and an alteration in other properties.All the tested aluminosilicate refractories containing 42–62% alumina when heated up to 1500°C in hydrogen rapidly lose their weight as a result of the reduction of the SiO₂, changing the structure of the surface layer, which is an active part of the catalyst carrier. These refractories cannot be recommended as carriers operating at high temperatures.The high-alumina refractories containing 79 and 90% Al₂O₃ have a much lower loss in weight, and during heating slightly change their porosity and other properties; they can be used as carriers for nickel catalysts.Translated from Ogneupory, No. 8, pp. 30–36, August, 1971.