pressure composition isotherm analyzer: pore size distribution

Adsorption Isotherm

Adsorption isotherm is the relationship between the pressure and adsorption amount at a constant temperature. The horizontal axis is the relative pressure (P/P₀) which is the equilibrium pressure divided by the saturation pressure. The relative pressure can be 0 to 1 and P/P₀ =1.0 means that the condensation of adsorptive occurs in the sample cell. So an adsorption isotherm is the measurement of adsorptive density which becomes higher than the bulk (gas) phase density due to the interaction between the adsorptive and solid surface atoms below its condensation pressure. Adsorption amount in the vertical axis is commonly expressed as V/ml (STP)g^-1 which is expressed by the standard gas volume (at 0^oC and 1 atm).

The figure indicates the classification of adsorption isotherms defined by IUPAC. The type of adsorption isotherm is determined by the pore size and surface character of the material.

i. Microporous materials (e.g. Zeolite and Activated carbon)
ii. Non porous materials (e.g. Nonporous Alumina and Silica)
iii. Non porous materials and materials which have the weak interaction between the adsorbate and adsorbent (e.g. Graphite/water)
iv. Mesoporous materials (e.g. Mesoporous Alumina and Silica)
v. Porous materials and materials that have the weak interaction between the adsorbate and adsorbent (e.g. Activated carbon/water)
vi. Homogeneous surface materials (e.g. Graphite/Kr and NaCl/Kr)

GOLD APP INSTRUMENTS

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H-Sorb 2600 high pressure gas adsorption parameters

Analysis Method: static volumetric, high pressure gas sorption

Versatility: adsorption/desorption isotherms measurement (atmospheric to 500℃), Gibbs supercritical adsorption measurement

Data Reduction: Langmuir model regression isotherm, PCT(Pressure-Composition-Temperature) or PCI (Pressure-Composition-Isotherm) diagram/curve/isotherm measurement, Langmuir maximum adsorption constant L and adsorption pressure constant B measurement; Langmuir correction model loading-ratio correlation regression (LCR) isotherm; Ono-Kondo (OK) lattice model isotherm regression; adsorptive gas density and vapor-liquid equilibrium accuracy calculation under different pressures and temperatures

Measuring Ranges: continuous adsorption and desorption measurement from atmospheric to 200Bar pressure

Accuracy: repeatability errors <3%

Temperature Range: cryogenic to 500℃, accuracy±0.1℃

Sample Ports: two samples analyzing and two degassing, stainless-steel micro welding sample cells, software integrated temperature PID adjustment

Transducer Accuracy: imported high precision transmitter, accuracy can reach 0.05% of F.S. (full-scale), long-duration usage stability is 0.025% of F.S.

Ultimate Vacuum: 4x10^-2 Pa (3x10^-4Torr), molecular pump system (1x10^-6 Pa) is optional

Adsorbate Gas: high purity nitrogen, CO₂ or others (Ar, Kr, H₂, CH₄ etc.)

Data Acquisition: high-precision and high integration data acquisition modules, minimal error, strong anti-interference ability

Specifications: Height 22.05 inches (56cm)* Width 20.87 inches (53cm)*Depth 23.62 inches (60cm); 132 pound (60kg); 220V/5A

H-Sorb 2600 high pressure gas adsorption features:

Control System: imported VCR interface high pressure pneumatic valve can realize auto on-off within 200Bar, sealing performance is top to 1x10^-10Pa.m3/s, can be used more than 500 million times; programmable logic controller (PLC) system, high integration and sound anti-interference, improve stability and prolong life
Analysis Management: parameters be set by software, fully automated, unattended operation at night; H-Sorb mode is available for accurate control gas charging pressure points, gain ideal data points
Manifold System: imported 316L stainless steel thick-walled manifolds, micro welding sealing can reduce dead space largely; metal VCR connection is convenient for installation and uninstallation
Safety Measures: H-Sorb asymptotic technology realizes auto gas-charging and degassing, prevents high pressure dangers caused by artificial misoperation, and also minimizes large differential pressure’s impact to pressure transducer

H-Sorb 2600 high pressure gas adsorption application

1. Study and research in high temperature and pressure gas sorption, supercritical gas performance, microporous materials, hydrogen storage materials, coalbed gas, oil exploration, methane etc.

2. Catalysts, molecular sieves, active carbon, carbon nano-tube, fuel cell, hydrocarbon and other materials

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