Diffusion and adsorption- Fundamentals and transient measurement methods

Diffusion and adsorption- Fundamentals and transient measurement methods

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Abstract of the talk:

Diffusion and adsorption of gases on solid surfaces are two important, highly correlated process steps which occur in numerous applications such as heterogeneous catalysis, gas storage processes, e.g. in shales, gas separation processes in chemical industry, host-guest systems, e.g. gas hydrates or MOF's, membrane processes, adsorption processes, porous electrodes, e.g. for fuel cells, and environmental applications, e.g. passive air samplers.

Depending on the application, different characterization methods for determining diffusion coefficients and heats of adsorption appeared. However, each method has its advantages or disadvantages with respect to the determined scale of the diffusion coefficient, to the representation of the coupled processes diffusion and adsorption, the accuracy , the use of additional gases supporting the transport in the measurement device, etc..

The lecture will 

  1. give a general introduction into diffusion and adsorption phenomena,
  2. present an overview of appropriate measurement techniques ,
  3. introduce the idea of transient measurement methods, and
  4. show some selected application examples for the TAP- (Temporal Analysis of Prodcuts) and FR- (Frequency Response) methods, which relate to diffusion and adsorption of gases in porous solids.

Brief biography of the speaker:

Cornelia Breitkopf is Full Professor and Chair of Technical Thermodynamics at the Technische Universität Dresden in Germany.

She studied chemistry at the Martin-Luther-University Halle-Wittenberg (Germany), where she received the diploma degree (Dipl.-Chem.) and afterwards the PhD in Physical Chemistry. The main aspects of these graduations had been related to theoretical quantum-chemical calculations of reaction mechanisms of enzyme related conversions.

After a postdoc position at the Birkbeck College/University of London in the group of Prof. Julia Goodfellow, she joined the Environmental Research Center in Leipzig, where she mainly dealt with the impact of xenobiotics and their distribution in the environment. During this time, she was a Guest Researcher at the Environmental Science Center in Peterborough/Canada in the group of Prof. Don Mackay.

At the University of Leipzig she finished her Habilitation in Technical Chemistry. During this time, she stayed for a few months at the University of Wisconsin in the group of Prof. James Dumesic dealing with microkinetic modeling. The main aspects of the habilitation work have been the application of transient methods for describing heterogeneously catalyzed reactions.

After habilitation she was Professor for Chemical Reaction Engineering in Leipzig and Freiberg. After that she moved to TU Munich to work as senior scientist also in the field of heterogeneous catalysis.

Since 2010 she is Full Professor in Dresden in the Department of Mechanical Science and Engineering and responsible for all lectures related to thermodynamics in the faculty, i.e., technical thermodynamics, chemical thermodynamics, process thermodynamics and applied molecular thermodynamics. All lectures are given for undergraduates and graduates in the engineering department.

Her main research interests are transient methods for the evaluation of transport and sorption parameters of gases in solid porous media accompanied with the modeling of complex transport phenomena, the theoretical determination of thermodynamic property data, the characterization of solid porous materials, and modeling of related physical phenomena by use of COMSOL and own programs.

Professor Cornelia Breitkopf
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