The static capacity method employed in 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 onto a material under various pressure conditions. The volumetric process works by introducing a known quantity of gas into the analysis chamber containing the sample, and then recording the equilibrium pressure once the system stabilizes. From this data, the amount of gas adsorbed by the sample can be calculated. This process is repeated across a range of pressures until the maximum pressure is reached. Afterward, the pressure is gradually reduced to generate an isotherm, allowing for the plotting of each equilibrium point—adsorption amount versus equilibrium pressure. To ensure high accuracy and reproducibility, the system uses separate sensors to monitor both the manifold and the sample chamber.
The instrument is expandable to a 4-position high-pressure adsorber, featuring four independent degassing stations for dual free space measurements. This ensures precise isotherm data can be obtained, with the ability to input free space values using NIST REFPROP compression factors for more accurate gas behavior calculations. The software provides interactive spreadsheet automation, enabling users to create isotherms and weight percent plots from raw data, including pressure vs. time, temperature vs. time, and adsorption volume vs. pressure. Real-time chart reports containing all relevant sample information can be generated when analyzing mixtures of up to three components. It also supports dynamic adsorption rate calculations and offers high-accuracy Langmuir isotherm modeling for gas adsorption. The solid-state pressure sensor ensures ±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 for safety.
This equipment finds wide application in various fields. In carbon dioxide sequestration studies, it helps assess how much COâ‚‚ can be adsorbed by carbon or other materials under high-pressure conditions, simulating subsurface injection scenarios. The low-temperature/heat bath configuration allows for testing over a range of stable temperatures, providing essential data for calculating the heat of adsorption. At higher pressures, COâ‚‚ tends to condense at ambient temperatures, so isotherms are typically analyzed below 50 bar.
For shale gas research, high-pressure methane injection into shale samples generates adsorption and desorption isotherms, helping determine the amount of methane present under specific pressure and temperature conditions. These isotherms are used to calculate the Langmuir surface area and shale volume, which are crucial for understanding gas storage potential. The Langmuir surface area represents the surface area of the shale when the gas is assumed to form a monolayer, while the Langmuir adsorption capacity indicates the maximum methane that can be adsorbed at infinite pressure.
In coalbed methane analysis, porous coal samples are tested under high pressure to evaluate their methane reserves. This helps determine the adsorption and desorption characteristics of coal seams, which are vital for estimating hydrocarbon reserves. Kinetic data from the system reveals how quickly methane is adsorbed or released under different conditions.
For hydrogen storage applications, the HPVA system measures the storage capacity of materials like porous carbon and metal-organic frameworks (MOFs). These materials are ideal for hydrogen storage due to their safe adsorption and desorption properties. The stored hydrogen in MOFs has a higher energy density than liquid hydrogen without requiring extreme cooling. The HPVA software provides a weight percent plot, showing the amount of gas adsorbed at a given pressure—a standard method for evaluating hydrogen storage performance.
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