Method and equipment for measuring amount of gas adsorbed by powder

A technology for adsorbing gas and gas volume, applied in measuring devices, suspension and porous material analysis, instruments, etc., can solve the problems of limited instrument accuracy, limited curve resolution, limited gas supply chamber size, etc., and achieve high resolution Effect

Inactive Publication Date: 2004-08-04
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of using the Borghard et al. method are the same as discussed above. The requirement for a very low flow rate means that the pressure change in the gas supply chamber is small. Due to the limited accuracy of the instrument, the number of points that can be measured on the absorption curve is reduced, thus limited curve resolution
Another disadvantage is that the precision of the pressure measuring instrument limits the size of the gas supply chamber, so that the gas absorption curve can only be measured in a small pressure range

Method used

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  • Method and equipment for measuring amount of gas adsorbed by powder
  • Method and equipment for measuring amount of gas adsorbed by powder
  • Method and equipment for measuring amount of gas adsorbed by powder

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Embodiment

[0091] The experimental procedures on nitrogen adsorption and desorption are listed below. Firstly, the dead volume of the sample cell is determined, which is the volume in the sample cell 10 not occupied by the sample 11 . Next, the adsorption isotherms and desorption isotherms were determined. In the following, the volume of the gas supply chamber 21 includes the volume of the pipe connected to the airflow control device 16 , and the dead volume of the sample cell 10 includes the volume of the pipe connected to the airflow control device 16 . The volume of the gas supply chamber 21 has been accurately measured in advance.

[0092] (1). Measurement and calculation of the dead volume of the sample cell 10:

[0093] The dead volume of the sample cell 10 can be obtained using a three-step correlation according to the gas law.

[0094] Step 1: measure the volume of the sample cell 10 without a sample at room temperature. The empty sample cell 10 is isolated from the gas supply ...

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Abstract

A method and device for measuring the amount of gas adsorbed by powder features that a prssure difference sensor is used to directly measure the pressure difference between gas supplying cavity and reference cavity whose gas amount is constant, and the algorithm for calculating the adsorbed amount is based on the pressure variations of specimen pool and gas supplying cavity or reference cavity. Its advantage is high correctness, precision and resolution.

Description

technical field [0001] The invention relates to a method and equipment for measuring the amount of adsorbed gas. The data becomes an adsorption isotherm, an isobaric absorption curve, or an adsorption-desorption isotherm, which belongs to the technical field of powder sample characterization. Background technique [0002] Measuring adsorption-desorption isotherms is also known as BET (Brunauer, Emmett, Teller) measurement. Measuring chemisorption isotherms is also known as gas-selective sorption measurements. Here, adsorption refers to physical adsorption or chemical adsorption. The specific surface area of ​​the powder sample can be obtained by processing the adsorption isotherm. The pore size distribution, pore volume and pore structure of the powder sample can be obtained by processing the adsorption-desorption isotherm. The specific surface area and particle size of the catalyst particles supported on the catalyst support can be obtained by processing the chemisorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/04G01N15/08
CPCG01N2015/0866G01N15/0893G01N7/04
Inventor 王德峥魏飞王金福
Owner TSINGHUA UNIV
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