Dynamics of ethane and propane in zeolite ZSM-5 studied by quasi-elastic neutron scattering

Chromatographic study of alkanes in silicalite: Transport properties

“…The fact that the isobutane data were better correlated with the crystal width rather than the effective crystal diameter is apparently caused by the anisotropic nature of the silicalite Paravar and Hayhurst, 1983Chiang et al, 1984bCaro et al, 1985Bulow et al, 1986aHayhurst and Paravar, 1988Eic and Ruthven, 1989Jobic et al, 1989Shen et al, 1990Hufton and Danner, 1991Jobic et al, 1992aJobic et al, 1992b channel network. The two continuous channels in silicalite run along the x and y directions: to move in the z direction an adsorbate must alternatively travel along both channel systems.…”

Using temporal analysis of products and flux response technology to determine diffusion coefficients in catalytic monoliths

“…These changes may be associated with the macroscopic techniques observing other effects such as desorption during measurements as well as the actual diffusion of the molecules in the micropores. These additional effects have been shown to strongly influence the diffusivities observed (Crank 1979;Ruthven, 1988b andVan den Begin et al, 1989;Heink et al, 1992;Jobic et al, 1992;Hufton and Danner, 1993;Silva and Rodrigues, 1996;Sun et al, 1996;Cavalcante et al, 1997;Nijhuis et al, 1999;Loos 2000;Ruthven and Brandani 2000;Gobin 2006;Gunadi and Brandani 2006;Richardson et al, 2008;Karge et al, 2008;Guimarães et al, 2010).…”

Beyond the Classical Transport Laws of Electrochemistry: New Microscopic Approach to Ionic Conductance and Viscosity

“…Following Burggraaf [53], we have calculated the permeability based on our Langmuir isotherm fits from section III A, and diffusivities from section III B. The theoretical flux is given as (8) where DC is the transport diffusivity and Pf (Pm) is the pressure on the feed (membrane) side.…”

“…There exists a large body of theoretical [2][3][4][5][6] and experimental [7][8][9][10][11][12][13][14] work that investigates the diffusion properties of small alkanes in zeolites. Simulations are generally performed with either Molecular Dynamics (MD) or Monte Carlo (MC) methods [15], both of which give calculated diffusivities that agree well with each other, although the MC methods, not having a true time dependence, rely on transition state theory for rate constants.…”