Microtrac BELSORP HP High-Pressure Volumetric Gas Adsorption Analyzer
| Brand | Microtrac |
|---|---|
| Origin | Japan |
| Model | BELSORP HP |
| Pressure Range | Up to 20 MPa (optional: 13.5 MPa) |
| Pressure Sensor Options | 1, 1.5, 2, 3.5, 13.5, or 20 MPa (±0.08% F.S.) |
| Temperature Control Range | 4.2 K – 673 K (via liquid He/N₂ cryostats, resistive furnaces, Peltier units, and air-bath thermal management) |
| Gas Inlets | 6 total (1 He for dead-volume calibration, 1 compressed air, 4 adsorptive gases) |
| Vacuum System | Optional turbomolecular pump + vacuum gauges |
| Compliance | Built-in compressibility factor (Z) and virial coefficient correction for non-ideal gas behavior |
| Sealing | Swagelok® filter-faced ferrules (0.5 µm pore size) |
| Thermal Stability | Air-bath manifold & reference chamber (15–35 °C, ±0.1 °C) |
| Software | BELSIM™ (isotherm modeling, PCT analysis), optional BELDyna™ (kinetic modeling: concentration vs. time, effective diffusivity, mass transfer coefficients) |
Overview
The Microtrac BELSORP HP is a high-precision volumetric gas adsorption analyzer engineered for quantitative characterization of gas-solid interactions under elevated pressure conditions—up to 20 MPa. It operates on the principle of manometric (volumetric) gas dosing and pressure decay measurement within a calibrated, thermostatically controlled system. By precisely monitoring pressure changes in a known free volume before and after gas introduction into a sample cell, the instrument calculates absolute adsorbed amount using real-gas equations of state. Its design integrates rigorous thermodynamic corrections—including compressibility factor (Z) and second virial coefficient adjustments—to ensure accuracy across wide pressure and temperature ranges. This capability makes it indispensable for research in hydrogen storage materials (e.g., MOFs, complex hydrides), methane capture in shale/coal matrices, CO₂-polymer interactions, pressure-swing adsorption (PSA) process development, and kinetic studies of gas uptake and desorption.
Key Features
- High-pressure operation up to 20 MPa, with configurable sensor options (1–20 MPa) offering ±0.08% full-scale accuracy
- Comprehensive temperature control architecture: 4.2 K (liquid helium) to 673 K (resistive furnace), supported by BEL Cryo™ (1H/2H/3H variants), BEL Thermo™ (Peltier, 10–50 °C), liquid nitrogen cryostats (77 K / 87 K), and programmable heating furnaces (50–400 °C standard; 50–800 °C high-temp option)
- Integrated air-bath thermal management for reference chamber and manifold (15–35 °C, ±0.1 °C stability), minimizing thermal drift during long-duration isotherms
- Six independent gas inlets: one for helium dead-volume calibration, one for compressed air purge, and four for adsorptive gases—each with dedicated solenoid valves and leak-tight Swagelok® fittings featuring 0.5 µm sintered metal filters to prevent particulate ingress
- Optional high-vacuum configuration with turbomolecular pump and capacitance manometer, enabling base pressures <1×10⁻⁷ Pa for ultra-low-pressure adsorption and outgassing validation
- Real-gas modeling engine embedded in firmware: automatic Z-factor and virial coefficient application per IUPAC-recommended EOS (e.g., GERG-2008, NIST REFPROP-compatible formulations)
Sample Compatibility & Compliance
The BELSORP HP accommodates powdered, pelletized, or monolithic solid samples (typically 0.1–2 g) in standardized stainless-steel or quartz sample tubes. It supports ASTM D7959-21 (hydrogen storage capacity), ISO 15901-2 (high-pressure physisorption), and USP (gas sorption in pharmaceutical excipients). Its hardware and software architecture comply with GLP/GMP data integrity requirements: audit-trail-enabled BELSIM™ logs all parameter changes, user actions, and calibration events. Optional 21 CFR Part 11 compliance packages include electronic signatures, role-based access control, and immutable raw-data archiving.
Software & Data Management
BELSIM™ serves as the core analytical platform, delivering automated isotherm acquisition, Langmuir/BET/Dubinin-Astakhov fitting, PCT (pressure-composition-temperature) curve generation, and thermodynamic parameter derivation (isosteric heat of adsorption, entropy change). The optional BELDyna™ module extends functionality to transient kinetics: it fits concentration-time profiles using linear driving force (LDF) and pore-diffusion models, outputting effective diffusivities (Deff) and overall mass transfer coefficients (kov). All data are stored in vendor-neutral HDF5 format, supporting third-party integration via Python API and export to CSV, Excel, or Origin-compatible templates.
Applications
- Hydrogen and methane storage material screening (MOFs, activated carbons, metal hydrides, covalent organic frameworks)
- Shale gas and coalbed methane adsorption isotherms at reservoir-relevant pressures (5–20 MPa)
- CO₂ capture assessment on amine-functionalized polymers and zeolites under flue-gas and direct-air-capture conditions
- PSA cycle design and breakthrough curve simulation using equilibrium and kinetic inputs
- Thermodynamic stability mapping of clathrate hydrates and gas-loaded nanocomposites
- Quality control of porous catalysts and battery electrode materials where gas-accessible surface area correlates with performance
FAQ
What gas species can be analyzed with the BELSORP HP?
H₂, CH₄, CO₂, N₂, Ar, He, and other non-corrosive gases—provided appropriate pressure sensors, seals, and calibration standards are selected.
Does the system support in-situ thermal pretreatment?
Yes. Integrated heating furnaces enable in situ degassing at up to 800 °C under dynamic vacuum or inert purge, with programmable ramp/soak profiles.
How is dead volume determined?
Via helium expansion into an evacuated sample cell at multiple temperatures; BELSIM™ applies iterative numerical correction based on measured thermal expansion of the cell and gas compressibility.
Can the instrument perform dual-gas competitive adsorption?
Not natively; it is a single-gas volumetric system. Competitive isotherms require sequential pure-gas measurements and subsequent modeling (e.g., IAST) within BELSIM™.
Is remote operation and monitoring supported?
Yes. The system includes Ethernet connectivity, web-based status dashboard, and secure remote desktop access for troubleshooting and method execution oversight.
