- Improving alkali and hydrothermal stability of Y=zeolite adsorption prods. surface treated with sodium aluminate

摘要

The removal of substances from aq. solns. by adsorbing onto dealuminated zeolite with a surface aluminated by treatment with sodium aluminate soln. according to DE44067763, comprises post-treatment with an aq. sodium or potassium water glass silicate soln. for 1-10 minutes at 10-90 deg. C and pH less than 12.5, immediately after alumination or an intermediate drying step. An adsorption agent is also claimed, contg. a complete micro-porous internal structure after de-alumination and provided with a hydrothermally stable surface layer of sodium or potassium aluminosilicate.