Sorption-Effect Chromatography

Buffham, B.A.; Mason, Geoffrey; Meacham, R.I.

doi:10.1093/chromsci/24.6.265

Cited by 12 publications

(8 citation statements)

References 19 publications

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“…The FRT system responds to any substance whose extent of sorption differs from that of the carrier, thereby making it possible to measure flow rate changes instantaneously as the capillary detection system behaves as though it has no volume (Buffham et al 1993). The arrangement of the DPT and matched capillaries provide the system with a resolution of one part in ten thousand, however, the response time of the system can be reduced further still at the expense of the sensitivity and vice-versa (Buffham et al 1986a(Buffham et al , 1986b. The internal diameter of the capillaries which control the pneumatic resistances are a compromise between these conflicting system requirements whereby the gas species are conveyed as quickly as possible to the packed bed, minimising dispersion within the system without restricting the sensitivity of the DPT to perform differential measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The technique is based on capillary viscometry and can be used to measure minuscule changes in flowrate between two gas streams for potentially any gaseous process involving a change in molar hold-up (δN/δt) (Buffham et al 1986a(Buffham et al , 1986bMason 1998;Russell et al 2002Russell et al , 2003Palmer et al 2011). FRT functions analogous to an electrical Wheatstone bridge assembly whereby gas molecules represent electrons and flow capillaries represent resistors.…”

Section: Fundamentals Of Frtmentioning

confidence: 99%

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Flux response technology applied in zero length column diffusivity measurements

Sasegbon

Hellgardt

2012

Adsorption

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Flux Response Technology (FRT) has been successfully adapted as an in situ perturbation technique in dynamic gas sorption measurements to extract hydrocarbon diffusion coefficients in alumina/CeZrO x washcoats of cordierite monoliths. FRT works by measuring minuscule changes in flowrate between two gas streams for any gaseous process involving a change in volume (δV /δt). Adand desorption transients, which can be collected during the same experimental run have been analysed using the zero length column (ZLC) method to study propane diffusivity within an alumina/CeZrO x washcoat as a function of temperature. Extracted diffusivities and activation energies compare favourably with literature data.

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Section: Resultsmentioning

confidence: 99%

Section: Fundamentals Of Frtmentioning

confidence: 99%

Flux response technology applied in zero length column diffusivity measurements

Sasegbon

Hellgardt

2012

Adsorption

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“…Flux response technology (FRT) is a powerful gas in situ perturbation technique that can be used to measure minuscule changes in flowrate between two gas streams for potentially any gaseous process involving a change in volume (dV /dt) (Buffham et al 1986(Buffham et al , 2000Russell et al 2003). FRT functions analogous to an electrical Wheatstone bridge assembly whereby gas molecules represent electrons and flow capillaries represent resistors.…”

Section: Fundamentalsmentioning

confidence: 99%

In situ measurement of gas adsorption processes using Flux Response Technology

2011

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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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“…The FRT method functions in a way that is analogous to an electrical Wheatstone bridge assembly whereby gas molecules represent electrons and flow capillaries represent resistors (Palmer et al, 2011). The technique is based on capillary viscometry and can be used to measure minuscule changes in flow rates between two gas streams for potentially any gaseous process involving a change in volume (dV/dt) (Buffham et al, 1986 and2002;Russell et al, 1986;Mason et al, 1998). Due to the pneumatic Wheatstone bridge configuration between the flow sensing and flow setting capillaries, FRT can make very sensitive differential measurements for a range of processes.…”

Section: Introductionmentioning

confidence: 99%