Physical adsorption analyzer technical characteristics - Database & Sql Blog Articles

The static capacity method used in the gas adsorption analyzer uses high-pressure adsorption and desorption isotherms using gases such as hydrogen, methane and carbon dioxide.

The volumetric method technique introduces a certain amount of a known gas (adsorbent) into the analysis chamber containing the sample to be tested, and records the final equilibrium pressure when the sample is in equilibrium with the adsorbed gas. These data are used to calculate the amount of gas adsorbed by the sample. This process is repeated during the set pressure interval until the preselected pressure is reached. The pressure is then reduced, providing a isotherm, and each equilibrium point (adsorption amount and equilibrium pressure) can be used to draw the isotherm. Good reproducibility and accuracy are achieved by monitoring the manifold and sample chamber with separate sensors.

Technical characteristics

Expandable to 4-position high pressure adsorber can be equipped with 4 independent degassing stations for dual free space measurements, ensuring accurate isotherm data can be measured or input free space using NIST REFPROP compression factor to correct non-ideal analytical gas reports providing interactive spreadsheet automation Create isotherms and weight percent plots to report calculated raw data table pressure versus time, temperature versus time, and adsorption volume versus pressure. Real-time chart report containing all sample information can be supplied using a mixture of up to three components Dynamic calculation of adsorption rate mechanical data Langmuir adsorption isotherm and gas adsorption calculation with high accuracy, solid-state design of pressure sensor with accuracy of ± 0.04% over the entire range, stability ± 0.1% system pressure up to 200bar hydrogen leaking hydrogen sensor Automatic shutdown system

Applications

In the study of carbon dioxide sequestration in the storage of carbon dioxide, it is important to assess the amount of carbon dioxide adsorbed by carbon or other materials. The high pressure in HPVA simulates the subsurface conditions of CO2 injection. The HPVA configuration low temperature/heat bath allows the user to assess the absorption of carbon dioxide over a range of stable temperatures, providing data for calculating the heat of adsorption. Since higher pressures cause condensation of carbon dioxide at ambient temperatures, the instrument typically analyzes isotherms below 50 bar. Shale gas high pressure methane is injected into shale samples to produce adsorption and desorption isotherms. This provides the amount of methane in the shale at a specific pressure and temperature. Adsorption isotherms can be used to calculate the Langumir surface area and shale volume. The Langmuir surface area is the surface area of ​​the shale when the adsorbed gas is assumed to be monolayer adsorbed. The amount of Langmuir adsorption is the amount of methane absorbed at an infinite pressure—the amount of methane that can be adsorbed to the surface of the sample. Coalbed methane Porous coal samples from the bed can be analyzed by HPVA to determine their methane reserves under high pressure. This allows the user to obtain the methane adsorption and desorption properties of the subterranean coal seam, which is useful for determining the approximate reserves of coal seam hydrocarbons. The kinetic data can show the adsorption and removal of methane from these porous carbon samples at specific pressures and temperatures. Attached rate. CO2 will condense at higher pressures. Hydrogen storage determines the hydrogen storage capacity of materials such as porous carbon and metal organic frameworks (MOFs), which is critical in modern clean energy demand. These materials are ideal for storage because they safely adsorb and desorb hydrogen. The adsorbed hydrogen stored in the MOFs has a higher energy density than the hydrogen, but does not require the low temperature required to maintain the hydrogen liquid state. The HPVA software provides a weight percent plot that illustrates the amount of gas adsorbed at a given pressure—the standard method of sample hydrogen storage.