Porous ceramic from clay and alumina concentrated suspensions (water content 28-35%) in the direct process of pore formation by reaction of metallic aluminium powder with water are obtained. Clay minerals form stable suspension thanks surface charge of particle surface, which is characterize by zeta potential. Clay minerals associate the developed pore structure after hydrogen elimination. After drying and sintering structure remains. Different materials structure is obtain by use kaolinite, illite or smectite because particles of these minerals have different zeta potential. Pore structure of obtained materials depends on the mineralogical composition of clay. Various admixtures (carbonate, sand) influences hydrogen elimination process and viscosity of suspension. The best catalytic properties characterises kaolinite with the highest zeta potential.