Periodic with crystal-like wall structure

Periodic Mesoporous Organosilicas with Crystal-Like Wall Structure... [Pg.587]

Jung et al [145] reported for the first time the adsorption of hydrogen at 78 K and room temperature under moderate pressure by a periodic mesoporous phenylene-silica with crystal-like wall structure and by mesoporous silica. They observed a maximum hydrogen uptake of 0.9 wt% in the highly ordered crystallike mesoporous phenylene-silica material at room temperature and 20 atm. The hydrogen capacity of the mesoporous silica material at 20 atm and room temperature was 2.2 times lower than that of the crystal-like PMO. [Pg.593]

The ordered benzene-silica hybrid material[228] has a hexagonal array of mesopores with a lattice constant of 52.5 A, and crystal-like pore walls that exhibit structural periodicity with a spacing of 7.6 A along the channel direction. The periodic wall structure results from alternating hydrophilic and hydrophobic layers, composed of silica and benzene, respectively. [Pg.565]