The static capacity method employed by gas adsorption analyzers utilizes high-pressure adsorption and desorption isotherms using gases such as hydrogen, methane, and carbon dioxide. This technique involves measuring the amount of gas that can be adsorbed by a sample under controlled conditions. The volumetric process technique introduces a known quantity of gas into an analysis chamber containing the sample, and it records the equilibrium pressure once the system stabilizes. These data are then used to calculate the amount of gas adsorbed by the sample. This procedure is repeated across a range of pressures until the maximum preselected pressure is reached. The pressure is then gradually reduced, allowing for the creation of an isotherm. Each equilibrium point—representing the adsorption amount and corresponding pressure—can be plotted to generate a complete isotherm. The system ensures high reproducibility and accuracy through the use of separate sensors for monitoring both the manifold and the sample chamber.
**Technical Characteristics**
This system is expandable to a 4-position high-pressure adsorber, featuring four independent degassing stations for dual free space measurements. This setup ensures precise isotherm data collection and allows for the input of free space using NIST REFPROP compression factors to correct for non-ideal gas behavior. The software provides interactive spreadsheet automation, enabling users to create isotherms and weight percent plots from raw data. It also generates real-time reports showing pressure versus time, temperature versus time, and adsorption volume versus pressure. A comprehensive report with all sample information can be generated using mixtures of up to three components. The system dynamically calculates adsorption rates and mechanical data, offering high-accuracy Langmuir isotherm modeling and gas adsorption calculations. It features a solid-state pressure sensor with ±0.04% accuracy across the entire range and ±0.1% stability. The system can operate at a maximum pressure of 200 bar and includes a hydrogen leak detection system with automatic shutdown.
**Applications**
In the study of carbon dioxide sequestration, it is essential to evaluate how much COâ‚‚ is adsorbed by carbon or other materials. The high-pressure configuration of the HPVA simulates subsurface conditions during COâ‚‚ injection. The low-temperature/heat bath option allows users to assess COâ‚‚ absorption over a range of stable temperatures, providing data for calculating the heat of adsorption. Due to the tendency of COâ‚‚ to condense at higher pressures under ambient conditions, the instrument typically operates below 50 bar for isotherm analysis.
For shale gas studies, high-pressure methane is injected into shale samples to generate adsorption and desorption isotherms. This helps determine the amount of methane present in the shale at specific pressures and temperatures. Adsorption isotherms can be used to calculate the Langmuir surface area and shale volume. The Langmuir surface area represents the surface area when the gas is assumed to form a monolayer on the sample, while the Langmuir adsorption capacity indicates the maximum methane uptake at infinite pressure.
In coalbed methane analysis, porous coal samples are tested under high pressure to assess their methane reserves. This provides valuable insights into the adsorption and desorption properties of subterranean coal seams, aiding in the estimation of hydrocarbon reserves. Kinetic data can also reveal how methane is adsorbed and released from these materials under different pressure and temperature conditions.
CO₂ tends to condense at higher pressures, making accurate measurement crucial. For hydrogen storage applications, the system determines the storage capacity of materials like porous carbon and metal-organic frameworks (MOFs), which are vital for clean energy technologies. These materials offer safe and efficient hydrogen storage, with MOFs capable of storing more hydrogen than liquid hydrogen without requiring extreme cooling. The HPVA software provides a weight percent plot, illustrating the amount of gas adsorbed at a given pressure—a standard metric for evaluating hydrogen storage performance.
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