Chmelik, Christian

Hibbe, Florian

Krishna, Rajamani

Kärger, Jörg

Lauerer, Alexander

Marthala, Venkata Ramana Reddy

van Baten, Jasper M.

Weitkamp, Jens

English

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The Open-Access Journal for the Basic Principles of Diffusion Theory, Experiment and ApplicationEnhancing diffusion selectivities by molecular traffic controlin FER-type zeolitesChristian Chmelik1∗, Florian Hibbe1, Alexander Lauerer1, Jo¨rg Ka¨rger1,Jasper M. van Baten2, Rajamani Krishna2, V.R. Reddy Marthala3, Jens Weitkamp31Universita¨t Leipzig, Leipzig, Germany2University of Amsterdam, Amsterdam, The Netherlands3University of Stuttgart, Stuttgart, Germany∗chmelik@physik.uni-leipzig.deDetailed understanding how molecular transport in nanoporous materials is influenced by various fea-tures of the host structure can provide new insights towards further optimization of their performance intechnical applications, such as catalysis, separations, molecular storage and sensing [1,2]. We present astudy of the diffusivity of small alkanes and alcohols in siliceous ferrierite [3]. A surprisingly high dif-ference in the diffusivities of methanol and ethanol has been observed (DMeOH/DEtOH ≈ 25,000). Thisdifference most likely results from an interplay of two phenomena, which have been recently discussedas options to manipulate mixture diffusion, viz. molecular traffic control and clustering effects. Themajor conclusion can be summarized in two points: (i) molecular traffic control effects can be facili-tated by molecular clustering and (ii) their combination provides a new option for enhancing diffusionselectivities and, thus, for further optimizing the use of nanoporous crystalline materials in technicalapplications.Figure 1: (a) CBMC snapshots showing the location of methanol and ethanol in Si-FER at a loading of 2 molec/ucat 298 K. (b) Comparison of the zero-loading diffusivities for various small molecules in Si-FER (triangles) andZIF-8 (spheres).References[1] B.M. Weckhuysen, Ed.: Diffusion in nanoporous materials. Chem. Soc. Rev. 39 (2010)[2] J. Ka¨rger, D.M. Ruthven, D.N. Theodorou: In-situ characterization of heterogeneous catalysts.Wiley-VCH, Weinheim (2012)[3] F. Hibbe, V.R.R. Marthala, C. Chmelik, J. Weitkamp, J. Ka¨rger: Micro-imaging of transient guestprofiles in nanochannels. J. Chem. Phys. 135, 184201 (2011)

Enhancing diffusion selectivities by molecular traffic control in FER-type zeolites

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Enhancing diffusion selectivities by molecular traffic control in FER-type zeolites

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