DIE-FORMED ARTICLES BASED ON PYROGENIC ALUMINIUM OXIDE, PROCESS FOR THEIR PRODUCTION AND THEIR USE

摘要

Die-formed articles based on pyrogenic alumina having the following physical-chemical data:… … external diameter                                  2 to 15 mm BET surface area                               60 to 115 m<2>/g pore volume                                 0.30 to 0.80 ml/g breaking strength                                100 to 300 N pore distribution        no pores of <5 nm diameter, at least                          80 % of the pores in the range from                          10 to 40 nm diameter composition              94 to 99 % by weight of Al2O3, the                          remainder being SiO2, … are produced by homogenising pyrogenic alumina with kaolin and/or graphite, urea, wax, sugar and starch with addition of water, drying at a temperature from 80 to 120 DEG C, comminution to give a powder, pressing the powder to give die-formed articles and heat-treating these for a period of 0.5 to 6 hours at a temperature from 400 to 1200 DEG C. …The die-formed articles can be used as a catalyst support and catalyst.