title: Kr/Xe Separation over a Chabazite Zeolite Membrane.
abstract: Herein we demonstrate that chabazite zeolite SAPO-34 membranes effectively separated Kr/Xe gas mixtures at industrially relevant compositions. Control over membrane thickness and average crystal size led to industrial range permeances and high separation selectivities. Specifically, SAPO-34 membranes can separate Kr/Xe mixtures with Kr permeances as high as 1.2 × 10 (-7) mol/m(2) s Pa and separation selectivities of 35 for molar compositions close to typical concentrations of these two gases in air. In addition, SAPO-34 membranes separated Kr/Xe mixtures with Kr permeances as high as 1.2 × 10 (-7) mol/m(2) s Pa and separation selectivities up to 45 for molar compositions as might be encountered in nuclear reprocessing technologies. Molecular sieving and differences in diffusivities were identified as the dominant separation mechanisms.
authors.affiliation: Chemical and Biological Engineering Department, Colorado School of Mines , Golden, Colorado 80401, United States.
authors.forename: Xuhui
authors.initials: X
authors.lastname: Feng
authors.affiliation: Chemical and Biological Engineering Department, Colorado School of Mines , Golden, Colorado 80401, United States.
authors.forename: Zhaowang
authors.initials: Z
authors.lastname: Zong
authors.affiliation: Pacific Northwest National Laboratory , Richland, Washington 99352, United States.
authors.forename: Sameh K
authors.initials: SK
authors.lastname: Elsaidi
authors.affiliation: Conn Center for Renewable Energy Research, University of Louisville , Louisville, Kentucky 40292, United States.
authors.forename: Jacek B
authors.initials: JB
authors.lastname: Jasinski
authors.affiliation: Van 't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Rajamani
authors.initials: R
authors.lastname: Krishna
authors.affiliation: Pacific Northwest National Laboratory , Richland, Washington 99352, United States.
authors.forename: Praveen K
authors.initials: PK
authors.lastname: Thallapally
authors.affiliation: Chemical and Biological Engineering Department, Colorado School of Mines , Golden, Colorado 80401, United States.
authors.forename: Moises A
authors.initials: MA
authors.lastname: Carreon