title: Note: Molecular diffusivity in a small pore zeolite measured by a variable pressure (piezometric) uptake method.
abstract: The use of numerical analysis to solve the diffusion equation in the uptake method allowed the measurement of molecular diffusivity in a zeolite with a variable pressure around it. The diffusivity was obtained from the data in the measurement of the adsorption isotherm, which means that the diffusivity measurement now needs neither a special instrument nor procedure. The diffusivities of all the gases are readily available from the measurement of their adsorption isotherms and these data include how the diffusivity changes versus adsorbed concentration. The modeling introduced can also be used for a zeolite with a surface barrier.
authors.affiliation: Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.affiliation: Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Yasukazu
authors.initials: Y
authors.lastname: Kobayashi
authors.affiliation: Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Usman
authors.initials: U
authors.lastname: Muhammad
authors.affiliation: Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Dezheng
authors.initials: D
authors.lastname: Wang
authors.affiliation: Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Wang