HPVA II VOLUMETRIC HIGH PRESSURE ANALYZER

Micromeritics HPVA II volumetric analyzer uses a static volumetric method to obtain adsorption and desorption isotherms at high pressure using gases such as hydrogen, methane and carbon dioxide. Analyzes a variety of materials including MOFs, zeolites and microporous carbon using only a few milligrams of sample. Get a better understanding of applications such as hydrogen storage, carbon dioxide sequestration, fuel cells and batteries, and hydrocarbon traps.

Features and benefits:

● One port or four sample ports with simultaneous analysis

● Typical adsorbates such as nitrogen, hydrogen, methane, argon, oxygen and carbon dioxide.

● Software includes NIST REFPROP

● Excellent sample temperature control with recirculating bath, cryo dewar, cryostat or oven.

● Manifold temperature is controlled by the heater for stability and accuracy.

HPVA II applications:

Capturing carbon dioxide

Estimating the amount of carbon dioxide that can be taken up by carbon and other materials is important in the ongoing study of carbon dioxide sequestration. High pressures produced by the HPVA II can mimic the subsurface conditions of areas where CO2 needs to be injected. HPVA II chilled/heated bath configuration allows the user to estimate CO2 uptake over a stable temperature range, providing data that can be used to calculate the heat of adsorption. These isotherms are usually analyzed at pressures up to about 50 bar at temperatures close to ambient temperature due to CO2 condensation at higher pressures.

Hydrogen storage

Determining the hydrogen storage capacity of materials such as porous carbon and metal-organic frameworks (MOFs) plays a key role in today's demand for clean energy sources. These materials are ideal for storage as they allow safe adsorption and desorption of hydrogen. Stored adsorbed hydrogen in an MOF has a higher volume energy density than gaseous hydrogen and does not require the cryogenic temperatures needed to keep hydrogen in a liquid state. HPVA II software provides a percentage by weight graph that illustrates the amount of gas adsorbed at a given pressure versus sample massﾗa standard method for estimating the hydrogen storage capacity of a sample.

Coal methane

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

Shale gas

Shale samples can be dosed with high pressure methane to obtain adsorption and desorption isotherms. This ensures the methane capacity of shale at certain pressures and temperatures. Adsorption isotherm can be used to calculate Langmuir surface area and shale volume. Langmuir surface area is the surface area of the shale, assuming that the adsorbed gas forms a single layer of molecules. Langmuir volume is the absorption of methane at infinite pressure - the maximum possible volume of methane that can be adsorbed on the surface of a sample.