Kevin Morgan - Correction for a possible reversible adsorption over an “inert” material

Version 1

      Publication Details (including relevant citation   information):

      Catalysis Science and Technology, Volume 1, Issue 5,   Pages 760-767 (2011)

      A. Goguet, C. Hardacre, B. Inceesungvorn, K. Morgan, S.O.   Shekhtman



      All TAP micro-reactor configurations contain inert particles   which are used so that the catalyst zone can be maintained under   isothermal conditions. Even on “inert” particles adsorption will   occur to some degree; however, the extent to which this occurs   has a critical influence on the analysis of the TAP data. In many   cases the assumption that there is no interaction between probe   molecules and inert particles is required as reversible   adsorption over inert material is problematic when the TAP model   has to be solved. Moreover, as the TAP pulse response experiments   are designed to be conducted within the Knudsen diffusion regime,   central to TAP data analysis is the characterization of the   diffusional transport of reagent molecules through the   micro-reactor, which is achieved via “diffusion only”   experiments over an inert one zone packing. Therefore, if there   are any processes occurring in addition to Knudsen diffusion over   the inert material, such as reversible adsorption, it is   important to factor these into the analysis. If these additional   processes are not included, the entire data analysis would be   questionable. The current work discloses the development of a   function which accounts for the adsorption over the inert   material, so that the TAP data analysis can be accurately   determined. This newly developed analysis method has been   exemplified using the selective reduction of oxygen in a hydrogen   rich ethylene feed over silver catalysts as a case study.

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