Measurement of diffusion in porous solids by zero length column (ZCL) methods

CO_2 adsorption equilibria of zeolite beds

The adaptation of flux response technology (FRT) as a novel in situ perturbation technique in gas sorption measurements continues to yield consistent results with literature values. Earlier studies have successfully reported on the FRT-zero length column method of studying propane diffusivity within an alumina/CeZrOx washcoat as a function of temperature (Maguire et al. in Chem Eng Sci 87:224–233, 2013; Sasegbon and Hellgardt in Adsorption, 2012). This study details FRT’s ability in quantifying and analysing the dynamic process of carbon dioxide (\(\hbox {CO}_{2}\)) adsorption on zeolites with varying Si/Al ratios as well as measurements of \(\hbox {CO}_{2}\) diffusion coefficients without the need for running separate experiments. This is made possible because FRT measures miniscule changes in transient flows in the order of \(10^{-2}\,\upmu \hbox {l}/\hbox {min}\) for gaseous processes involving a change in volume (\(\hbox {d}V/\hbox {d}t\)). These changes are measured directly by a very sensitive differential pressure transducer in a pneumatic system analogous to an electrical Wheatstone bridge assembly, whereby gas molecules replace electrons and capillaries function as resistors.

Flux Response Technology (FRT) Applied in Zero Length Column Diffusivity and Adsorption Measurements

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Flux Response Technology (FRT) Applied in Zero Length Column Diffusivity and Adsorption Measurements