Preparation of Porous Mordenite/Calcium Silicate Hydrate Composites for Indoor Environment Control

A micro/mesoporous composite was prepared by a hydrothermal reaction using mordenite and slaked lime to create a comfortable and safe indoor environment. After the hydrothermal reaction, calcium silicate hydrates formed due to the reaction of slaked lime, mordenite, and quartz, led to the generation of mesopores with a broad pore size distribution of more than 3 nm. In this experiment, the microporous structure of mordenite partially collapsed due to dissolution. As compared with mordenite, the composites exhibited higher water-vapor adsorption/desorption properties using their mesopores. The amount of adsorbed harmful gases at 70% relative humidity was larger for the composites than for mordenite.