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Senior Leadership Team

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1726738595431

Sorption Symposium North America 2024 (7 – 9 May)
Gathers Leading Sorption Experts in New Jersey

University of Vienna Plays Host to
Sorption Symposium Europe 2024 (18 – 20th Sept)

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New Team members

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GravimetricVolumetricChromatographic
Short DescriptionA microbalance directly measures the change in weight as the gas/vapor is adsorbed in the material.The sample is placed in an enclosed cell, where successive doses of gas are introduced. Pressure in the cell is monitored.A stream of known molar flowrate is passed through a column / packed bed. Concentration at the outlet is monitored and a mass balance is calculated.
Primary Measured ParametersSample weight change. Temperature & pressure/concentration.Pressure decay in a closed cell of known volume. Temperature & pressure/concentration.Flowrate in/out of a packed bed. Temperature & pressure/concentration before and after the bed.
Sample Minimum Amountfrom 1-10 mgfrom ~50-100 mgFrom 50-100 mg
Sample Maximum Amount1 – 100 g1-5 g100 g – few kg
ProsHighly accurate and flexible with samples and measurement conditions. Smallest sample amounts needed. Direct measurement of uptake. Can operate in both dynamic and static mode. Provides sorption kinetics by default. Can easily perform both isotherm (pressure scan) and isobar (temperature scan) experiments. Sample drying/activation is followed directly and quantified.Low complexity, simple to implement and to parallelize. Straightforward to obtain wide temperature and pressure ranges. Easier to hyphenate as the sample can be located away from the instrument.Provides true multicomponent sorption data from mixtures. Pulse retention time can be used to determine isotherms and surface parameters. IGC method can measure minute surface areas. Can provide information into process relevant parameters – mass and heat transfer.
ConsComplex engineering required– best with bespoke instrumentation. Cannot measure true multicomponent sorption, though can measure total amount adsorbed from a mixture. Buoyancy correction may be difficult at high pressures.Indirect measurement of uptake – must rely on equations of state. Cannot use dynamic or carrier probe introduction. Difficult to record isobars and sorption kinetics. Cannot measure multicomponent sorption. Incremental compounding error for each dose. Pressure gradients between sample and reference can be significant at low partial pressures.Indirect measurement of uptake – must rely on equations of state. Complex to set up and correctly analyze data – best with bespoke instrumentation. Often not suitable for fine powders due to pressure drop.
Method ApplicableStatic & dynamic introduction
Pure & carrier
Static only
Pure & carrier
Dynamic only
Pure & carrier
Sorption Kinetics final
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Fig 2 - horizontal
Fig 3 - horizontal
Fig 4 horizontal
Sorption Kinetics final
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Fig 2 - horizontal
Fig 2 static vs dynamic
Sorption Kinetics final
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Fig 2 - horizontal
Sorption Kinetics final
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Sorption Blog 2 - fig 1
Sorption Kinetics final
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Sorption Kinetics final

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