In situ measurement of gas adsorption processes using Flux Response Technology |
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Authors: | Candice Palmer Ayodeji Sasegbon Klaus Hellgardt |
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Institution: | (1) Catalysis and Conversion Process Division, Indian Institute of Petroleum, Dehradun, 248005, India; |
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Abstract: | Flux Response Technology (FRT) is being developed as a powerful in situ perturbation technique to facilitate detailed characterisation
of heterogeneous catalysts. FRT works by measuring minuscule changes in flowrate between two gas streams for potentially any
gaseous process involving a change in volume (dV/dt). FRT functions analogous to an electrical Wheatstone bridge assembly whereby gas molecules represent electrons and flow
capillaries represent resistors. A perturbation of pressure, temperature, but particularly of concentration causes an imbalance
in the system, which is measured directly by a very sensitive differential pressure transducer (DPT). It is demonstrated how
FRT can provide a simple, inexpensive, highly accurate means of quantifying the acidic sites of zeolites using ammonia ad/desorption
as well as determining the dynamically available surface areas of catalysts using nitrogen adsorption at liquid nitrogen temperature.
Temperature programmed experiments (temperature perturbations) can also be employed with FRT to rapidly compare catalyst activity
directly (for catalyst development but also for quality control) without the need for much calibration. |
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Keywords: | |
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