Test function

Adsorption performance tests such as adsorption-desorption isotherm and adsorption kinetics

Constant pressure adsorption kinetics

Constant pressure adsorption kinetic analysis (constant pressure adsorption and desorption rate)

Number of analysis bits

4 or 8 analysis positions are optional; Simultaneous analysis of multiple analysis positions can greatly improve the test efficiency and speed up the progress of scientific research for the characteristics of slow adsorption rate and low adsorption test efficiency of the gravimetric method at constant pressure; The analysis environment of multiple analysis positions is completely consistent, The slight difference in adsorption performance of the same batch of materials can be known;

Microbalance

Resolution / Range

Original imported industrial micro balance, 1ug/5000mg (0.1ug/500mg optional); Compared with similar products, the range is increased by 2-5 times, the range of sample loading is broadened, the representativeness of sampling is increased, and the accuracy is improved;

Test gas type

Water vapor, organic vapor, and various non-corrosive gases such as CO2 and alkenes;

Whether NH3, SO2 and other corrosive gas adsorbates are optional

Yes

Fully automatic cycle adsorption test (recommended configuration)

Fully automatic constant pressure variable temperature adsorption and desorption; Automatic constant temperature variable pressure adsorption and desorption; Automatic temperature variable pressure variable adsorption and desorption; Automatic cycle adsorption and desorption life evaluation;

Switching mode between degassing furnace and constant temperature bath (recommended configuration)

Fully automatic switching; Especially for fully automatic cycle adsorption life evaluation;

Adsorption test temperature

Constant temperature bath, -5℃～150℃, accuracy ±0.1℃;

Steam anti-condensation

The gas system is fully constant temperature, room temperature ~ 60°C, accuracy 0.1°C;

Steam generation method

"Static evaporation" method

"Carrier gas mixing" flow method

Vapor "humidity/partial pressure" control range

0.1%～98% P/P0

2%～98% P/P0, lower P/P0 is optional

Reagent Tube Liquid Reagent Capacity

120ml

120ml has the patented technology of reagent saturation condensation recovery, which improves the utilization rate of reagents and reduces the consumption of reagents

Degassing activation pretreatment

Vacuum degassing, molecular pump high vacuum degassing function is recommended; room temperature ~ 400 ℃, accuracy ± 0.1 ℃;

Atmospheric pressure purging and degassing; room temperature ~ 300 ° C, accuracy ± 0.1 ° C;

Visual temperature programmed degassing

32-stage heating program to prevent samples from flying; real-time visualization of the sample constant weight process to accurately determine whether the sample is completely degassed;

Buoyancy correction

Mode 1: Buoyancy calculation mode (default); Mode 2: Blank buoyancy background subtraction mode; Mode 3: Background subtraction curve mode;

Blank bit synchronization test

Support blank position as background and buoyancy deduction synchronous test; eliminate system error, greatly improve test accuracy and stability;

Vapor removal vacuum system

Yes, double-pump vacuum system; high vacuum mechanical pump + steam pump; steam pump has a program-controlled steam removal function;

Molecular pump high vacuum system (recommended configuration)

Original imported molecular pump, the vacuum degree is better than 10E-6 torr; it can greatly reduce the residual vapor background and improve the test accuracy;

Segmental pressure measurement

Dual pressure sensor segment test; original imported capacitive film pressure sensor;

Pneumatic control high vacuum baffle valve

Original imported air-controlled high-vacuum baffle valve; large diameter, air-controlled zero heat;

Mass flow controller

Imported high-precision mass flow controller MFC; realize precise gas and vapor concentration control;

Key indicator

Gravimetric method

Volumetric method

Quantitative method

The adsorption amount is determined by weighing the weight change before and after adsorption, referred to as "gravimetric method".

Through the pressure change before and after adsorption in a certain volume, the adsorption amount is calculated according to the "ideal gas state equation", referred to as "volume method" or "volume method".

Core Quantitative Components

Micro balance

The accuracy of weight sensors is usually 1-2 orders of magnitude higher than that of pressure sensors.

Pressure Sensor

One-thousandth of a reading accuracy is the highest accuracy for a pressure sensor, but relatively low for a microbalance

Main Adsorbate Types

Organic vapour, water vapour, gas.

The quantitative method does not depend on the ideal gas state equation, but only depends on the weight change, so it can not only test gas adsorption, but also has inherent advantages in vapor adsorbates.

Gas

Since the ideal gas state equation has a narrow quantitative range for steam and has a large error, the volumetric method is only suitable for gas quantification, and the quantitative error is relatively large for steam that is greatly different from the ideal gas.

Adsorption Kinetic Analysis

It can obtain isobaric adsorption rate data, and can conduct adsorption kinetic analysis of gas and steam, water activity analysis, etc.

Because it is quantified according to the pressure change before and after adsorption, the isobaric adsorption rate data cannot be obtained, and the adsorption kinetics analysis cannot be performed. Only the pressure swing adsorption rate curve can be given.

Degassing pretreatment

The "thermogravimetric" curve of the relationship between temperature, weight and time during the degassing pretreatment process can be obtained, and it can be accurately known whether the sample has a constant weight, so as to know whether the treatment is "clean".

A certain degassing time can only be set based on experience, and it is impossible to know whether the specific sample is degassed "clean". (Generally, the degassing time should be increased as much as possible under the permissible conditions, and the efficiency should be reduced to ensure the degassing effect.)

Whether to test temperature distribution

No

Direct weighing, the quantification has nothing to do with the temperature area, and the error factor is small.

Yes

Since it is necessary to know the amount of "residual" gas in each temperature zone to know the adsorption amount of the sample, it is necessary to test the distribution of temperature zones, which has many sources of error introduction.