Methodological and operational aspects of permeation measurements on silicalite-1 membranes

Multicomponent hydrogen/hydrocarbon separation by MFI‐type zeolite membranes

“…It should be noted that numerous efforts have been made to understand the mechanism and develop theoretical models for mass transport Ž through zeolite films Vroon et al, 1998;Bakker et al, 1997;van de Graaf et al, 1999;Krishna and van de Boeke, 1995; . Kapteijn et al, 1995 . However, most of the previous work dealt with single-gas permeation. There is no successful model reported in the literature for the quantitative description of multicomponent gas transport through a zeolite membrane.…”

“…1998 . Some experimental studies on the permeation of a single-gas and binary-gas mixture have been carried out with Ž MFI zeolite membranes Bai et al, 1995;Bakker et al, 1996Bakker et al, , 1997Funke et al, 1996;Coronas et al, 1997Coronas et al, , 1998van de . Graaf et al, 1998;Vroon et al, 1998 .…”

Zeolite Membranes

“…Recently Kapteijn [107±109] and van de Graaf [252] reported, for the same membrane, the selectiv-A. Tavolaro, E. Drioli/Zeolite Membranes Table 9.…”

Modelling gas permeation through new microporous titanosilicate AM-3 membranes

“…The transport of strongly adsorbable molecules at low or moderate temperatures is dominated by surface diffusion, while activated gaseous diffusion may prevail at high temperatures [33][34][35]. In this case, a maximum followed by a minimum in the permeance should be anticipated [16,[36][37][38]. At low temperatures, permeance increases because the diffusivity of adsorbed molecules is enhanced by temperature, even though the surface coverage simultaneously decreases; at a given temperature, the decrease in the adsorbed concentration becomes the determining factor, so that the overall permeance will start to decrease.…”