HPVA II High Pressure Volmetric Analyzer

Typical Applications

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Carbon dioxide sequestration image Carbon Dioxide Sequestration

Evaluating the quantity of carbon dioxide that can be adsorbed by carbons and other materials is important in the ongoing study of carbon dioxide sequestration. High pressures obtained with the HPVA II can simulate the underground conditions of sites where CO2 is to be injected. Configuring the HPVA II with a chiller/heater bath allows the user to evaluate the CO2 uptake at a range of stable temperatures, providing data that can be used to calculate heats of adsorption. These isotherms are typically analyzed up to approximately 50 bar at near ambient temperatures due to CO2 condensation at higher pressures.

Shale gas icon Shale Gas

High-pressure methane can be dosed onto shale samples to generate adsorption and desorption isotherms. This provides the methane capacity of the shale at specific pressures and temperatures. The adsorption isotherm can be used to calculate the Langmuir surface area and volume of the shale. The Langmuir surface area is the surface area of the shale assuming that the adsorbate gas forms a single layer of molecules. The Langmuir volume is the uptake of methane at infinite pressure − the maximum possible volume of methane that can be adsorbed to the surface of the sample.

 Coal bed methane icon Coal-Bed Methane

Porous coal samples from underground beds can be analyzed with the HPVA II to determine their methane capacity at high pressures. This allows the user to find the methane adsorption and desorption properities of the underground coal beds, which is useful in determining approximate amounts of hydrocarbons available in coal-bed reserves. Kinetic data from the experiments can also show the rate of metane adsorption and desorption on these porous carbon samples at specific pressures and temperatures.

 Hydrogen storage icon Hydrogen Storage

Determining the hydrogen storage capacity of materials such as porous carbons and metal organic frameworks (MOFs) is pivotal in the modern demand for clean energy sources. These materials are ideally suited for storage because they allow you to safely adsorb and desorb the hydrogen. Stored adsorbed hydrogen in MOFs has a higher energy density by volume than a gaseous hydrogen and does not require the cryogenic temperatures needed to maintain hydrogen in a liquid state. The HPVA II software provides a weight percentage plot that illustrates the amount of gas adsorbed at a given pressure as a function of the sample mass − the standard method for reviewing a sample’s hydrogen storage capacity.